WSR 98-10-029

PERMANENT RULES

DEPARTMENT OF

LABOR AND INDUSTRIES

[Filed April 24, 1998, 11:30 a.m., effective July 24, 1998]



Date of Adoption: April 24, 1998.

Purpose: Air contaminants, chapter 296-62 WAC, General occupational health standards, the department began review of WAC 296-62-07515 Control of Chemical Agents Table 1: Limits for Air Contaminant Permissible Exposure Limits (PEL) after OSHA published correcting amendments August 4, 1997, in the Federal Register (Volume 61, Number 149, page 42018). Based on that review, permanent amendments are made to WAC 296-62-07515 Control of chemical agents and WAC 296-62-07477 Appendix C for the methylene chloride standard as described below.

Amended WAC 296-62-07515 Control of chemical agents, a federal-initiated amendment adds the abbreviation "(DBCP)" to Dibromo-d-chloropropane. No new compliance requirements are added. No other federal-initiated amendments are made.

State-initiated amendments are being made to Table 1: Limits for Air Contaminants Permissible Exposure Limits (PEL). The following amendments establish new compliance requirements.

Chromic acid and chromates (as CrO3) PEL is changed from 0.1 mg/m3 TWA (time-weighted average) to 0.1 mg/m3 ceiling limit making this PEL identical to OSHA's rule (Code of Federal Regulations 1910.1000 Table Z-1 and Z-2) and WISHA at least as effective as OSHA. This reverses a recent change made in error, which took effect November 5, 1997.

Mercury (aryl and inorganic) (as Hg) PEL is changed from 0.1 mg/m3 TWA to 0.1 mg/m3 ceiling limit which makes this PEL identical to OSHA's rule (Code of Federal Regulations 1910.1000 Table Z-1 and Z-2) and provides appropriate protection of the health of workers where these chemicals are used.

The following state-initiated amendments do not establish additional compliance requirements.

A skin designation is added to carbon tetrachloride to make it consistent with the health data. This will not establish additional compliance requirements because of the current personal protective equipment requirements for use of carbon tetrachloride.

A new note is added for all respirable fraction PELs to reflect the current ACGIH definition of respirable fraction.

A new entry for arsenic, inorganic compounds (as As) PEL is added to include the 10 ug/m3 PEL found in WAC 296-62-07347 Inorganic arsenic standard for all uses covered by WAC 296-62-07347. This does not replace the existing PEL for arsenic, inorganic compounds which applies to all uses not covered by WAC 296-62-07347.

Note g/ is deleted to eliminate confusion.

Other minor amendments are made to correct typographical errors, correct errors in references, delete duplicate lines, correct lettering in notes and improve the clarity of information presented.

WAC 296-62-07477 Appendix C--Questions and answers (appendix to methylene chloride standard located in Part G of chapter 296-62 WAC, General occupational health standards), state-initiated amendments remove the word "Solution" from Figure 2. This is a minor correction that does not establish additional compliance requirements.

Citation of Existing Rules Affected by this Order: Amending WAC 296-62-07477 Appendix C and WAC 296-62-07515 Control of chemical agents.

Statutory Authority for Adoption: RCW 49.17.040, [49.17].050, [49.17].060.

Adopted under notice filed as WSR 98-05-061 on February 16, 1998.

Changes Other than Editing from Proposed to Adopted Version: WAC 296-62-07515 Control of chemical agents, the following minor changes were made to the final rule to make the permissible exposure limit (PEL) table easier to use. None of these changes represents a substantive change to either the existing standard or the standard as proposed in the proposed standard as published in the Washington State Register.

1. A second listing is added to the table to "Arsenic, inorganic compounds" reflecting the existing 10 µg/m3 PEL requirement from WAC 296-62-07347 Inorganic arsenic. The existing PEL in the table would remain in place and would continue to apply to the exceptions to WAC 296-62-07347.

2. Duplicate PEL information is deleted for:

Silica, amorphous, diatomaceous earth;

Dinitolmide.

3. Note "g/" is deleted. Note "g/" provided the total dust equations for Quartz Silica from the table.

4. Formatting changes are made throughout the table to make the format consistent and correcting typographical errors.

Number of Sections Adopted in Order to Comply with Federal Statute: New 0, amended 0, repealed 0; Federal Rules or Standards: New 0, amended 2, repealed 0; or Recently Enacted State Statutes: New 0, amended 0, repealed 0.

Number of Sections Adopted at Request of a Nongovernmental Entity: New 0, amended 0, repealed 0.

Number of Sections Adopted on the Agency's Own Initiative: New 0, amended 1, repealed 0.

Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 0, amended 1, repealed 0.

Number of Sections Adopted Using Negotiated Rule Making: New 0, amended 0, repealed 0; Pilot Rule Making: New 0, amended 0, repealed 0; or Other Alternative Rule Making: New 0, amended 0, repealed 0.

Effective Date of Rule: July 24, 1998.

April 24, 1998

Gary Moore

Director

OTS-1968.1

AMENDATORY SECTION (Amending WSR 97-18-062, filed 9/2/97, effective 12/1/97)



WAC 296-62-07477  Appendix C.



Questions and Answers

Methylene Chloride Control in Furniture Stripping

(Adapted from NIOSH publication No. 93-133)



Introduction

This appendix answers commonly asked questions about the hazards from exposure to methylene chloride. It also describes approaches to controlling methylene chloride exposure during the most common furniture stripping processes. Although these approaches were developed and field tested by the National Institute of Occupational Safety and Health, each setting requires custom installation because of the different air flow interferences at each site.



1. What is the Stripping Solution Base?

The most common active ingredient in paint removers is a chemical called methylene chloride. Methylene chloride is present in the paint remover to penetrate, blister, and finally lift the old finish. Other chemicals in paint removers work to accelerate the stripping process, to retard evaporation, and to act as thickening agents. These other ingredients may include: methanol, toluene, acetone, or paraffin.1



2. Is Methylene Chloride Bad for Me?

Exposure to methylene chloride may cause short-term health effects or long-term health effects.



Short-Term (Acute) Health Effects

Exposure to high levels of paint removers over short periods of time can cause irritation to the skin, eyes, mucous membranes, and respiratory tracts. Other symptoms of high exposure are dizziness, headache, and lack of coordination. The occurrence of any of these symptoms indicates that you are being exposed to high levels of methylene chloride. At the onset of any of these symptoms, you should leave the work area, get some fresh air, and determine why the levels were high.



A portion of inhaled methylene chloride is converted by the body to carbon monoxide, which can lower the blood's ability to carry oxygen. When the solvent is used properly, however, the levels of carbon monoxide should not be hazardous. Individuals with cardiovascular or pulmonary health problems should check with their physician before using the paint stripper. Individuals experiencing severe symptoms such as shortness of breath or chest pains should obtain proper medical care immediately.1



Long-Term (Chronic) Health Effects

Methylene chloride has been shown to cause cancer in certain laboratory animal tests. The available human studies do not provide the necessary information to determine whether methylene chloride causes cancer in humans. However, as a result of the animal studies, methylene chloride is considered a potential occupational carcinogen. There is also considerable indirect evidence to suggest that workers exposed to methylene chloride may be at an increased risk of developing ischemic heart disease. Therefore, it is prudent to minimize exposure to solvent vapors.3



3. What does the Methylene Chloride Standard Require?

On January 10, 1997, the Occupational Safety and Health Administration published a new regulation for methylene chloride. The standard establishes an eight-hour time-weighted average exposure limit of 25 parts per million (ppm), as well as a short-term exposure limit of 125 ppm determined from a 15 minute sampling period. That is a reduction from the current WISHA limit of 100 ppm. The standard also sets a 12.5 ppm action level (a level that would trigger periodic exposure monitoring and medical surveillance provisions).2 WISHA adopted an identical standard on[date].



The National Institute for Occupational Safety and Health recommends that methylene chloride be regarded as a "potential occupational carcinogen." NIOSH further recommends that occupational exposure to methylene chloride be controlled to the lowest feasible limit. This recommendation was based on the observation of cancers and tumors in both rats and mice exposed to methylene chloride in air.5



4. How Can I Be Exposed to Methylene Chloride while Stripping Furniture?

Methylene chloride can be inhaled when vapors are in the air. Inhalation of the methylene chloride vapors is generally the most important source of exposure. Methylene chloride evaporates quicker than most chemicals. The odor threshold of methylene chloride is 300 ppm.6 Therefore, once you smell methylene chloride, you are being over-exposed. Pouring, moving, or stirring the chemical will increase the rate of evaporation.



Methylene chloride can be absorbed through the skin either by directly touching the chemical or through your gloves. Methylene chloride can be swallowed if it gets on your hands, clothes, or beard, or if food or drinks become contaminated.



5. How Can Breathing Exposures be Reduced?

Install a Local Exhaust Ventilation System



Local exhaust ventilation can be used to control exposures. Local exhaust ventilation systems capture contaminated air from the source before it spreads into the workers' breathing zone.7 If engineering controls are not effective, only a self-contained breathing apparatus equipped with a full face piece and operated in a positive-pressure mode or a supplied-air respirator affords the level of protection. Air-purifying respirators such as gas masks with organic vapor canisters can only be used for escape situations.8 These gas masks are not suitable for normal work situations because methylene chloride is poorly absorbed by the canister filtering material.



A local exhaust system consists of the following: a hood, a fan, ductwork, and a replacement air system.9,10,11 Two processes are commonly used in furniture stripping: flow-over and dip tanks. For flow-over systems there are two common local exhaust controls for methylene chloride - a slot hood and a down draft hood. A slot hood of different design is most often used for dip tanks. (See Figures 1, 2, and 3.)



The hood is made of sheet metal and connected to the tank. All designs require a centrifugal fan to exhaust the fumes, ductwork connecting the hood and the fan, and a replacement air system to bring conditioned air into the building to replace the air exhausted.



In constructing or designing a slot or down draft hood, use the following data:





Place illustration here.





Place illustration here.






Place illustration here.








Place illustration here.





Safe Work Practices

Workers can lower exposures by decreasing their access to the methylene chloride.12



1) Turn on dip tank control system several minutes before entering the stripping area.

2) Avoid unnecessary transferring or moving of the stripping solution.

3) Keep face out of the air stream between the solution-covered furniture and the exhaust system.

4) Keep face out of vapor zone above the stripping solution and the dip tank.

5) Retrieve dropped items with a long handled tool.

6) Keep the solution-recycling system off when not in use. Cover reservoir for recycling system.

7) Cover dip tank when not in use.

8) Provide adequate ventilation for rinse area.



How Can Skin Exposures Be Reduced?

Skin exposures can be reduced by wearing gloves whenever you are in contact with the stripping solution.13



1) Two gloves should be worn. The inner glove should be made from polyethylene/ethylene vinyl alcohol (e.g., Silver Shield®, or 4H®). This material, however, does not provide good physical resistance against tears, so an outer glove made from nitrile or neoprene should be worn.

2) Shoulder-length gloves will be more protective.

3) Change gloves before the break-through time occurs. Rotate several pairs of gloves throughout the day. Let the gloves dry in a warm well ventilated area at least over night before reuse.

4) Keep gloves clean by rinsing often. Keep gloves in good condition. Inspect the gloves before use for pin-holes, cracks, thin spots, and stiffer than normal or sticky surfaces.

5) Wear a face shield or goggles to protect face and eyes.



6. What Other Problems Can Occur?

Stripping Solution Temperature



Most manufacturers of stripping solution recommend controlling the solution to a temperature of 70F. This temperature is required for the wax in the solution to form a vapor barrier on top of the solution to keep the solution from evaporating too quickly. If the temperature is too high, the wax will not form the vapor barrier. If it is too cold, the wax will solidify and separate from the solvent causing increased evaporation. Use a belt heater to heat the solution to the correct temperature. Call your solution manufacturer for the correct temperature for your solution.14



Make-Up Air

Air will enter a building in an amount to equal the amount of air exhausted whether or not provision is made for this replacement. If a local exhaust system is added a make-up or replacement air system must be added to replace the air removed. Without a replacement air system, air will enter the building through cracks causing uncontrollable eddy currents. If the building perimeter is tightly sealed, it will prevent the air from entering and severely decrease the amount exhausted from the ventilation system. This will cause the building to be under negative pressure and decrease the performance of the exhaust system.15



Dilution Ventilation

With general or dilution ventilation, uncontaminated air is moved through the workroom by means of fans or open windows, which dilutes the pollutants in the air. Dilution ventilation does not provide effective protection to other workers and does not confine the methylene chloride vapors to one area.16



Phosgene Poisoning from Use of Kerosene Heaters

Do not use kerosene heaters or other open flame heaters while stripping furniture. Use of kerosene heaters in connection with methylene chloride can create lethal or dangerous concentrations of phosgene. Methylene chloride vapor is mixed with the air used for the combustion of kerosene in kerosene stoves. The vapor thus passes through the flames, coming into close contact with carbon monoxide at high temperatures. Any chlorine formed by decomposition may, under these conditions, react with carbon monoxide and form phosgene.17



references



1Halogenated Solvents Industry Alliance and Consumer Product Safety Commission [1990]. Stripping Paint from Wood (Pamphlet for consumers on how to strip furniture and precautions to take). Washington DC: Consumer Product Safety Commission.

2Ibid.

3NIOSH [1992]. NIOSH Testimony on Occupational Safety and Health Administration's proposed rule on occupational exposure to methylene chloride, September 21, 1992, OSHA Docket No. H-71. NIOSH policy statements. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health.

456 Fed. Reg. 57036 [1991]. Occupational Safety and Health Administration: Proposed rule on occupational exposure to methylene chloride.

5NIOSH [1992].

6Kirk, R.E. and P.F. Othmer, Eds. [1978]. Encyclopedia of Chemical Technology, 3rd Ed., Vol. 5:690. New York: John Wiley & Sons, Inc.

7ACGIH [1988]. Industrial Ventilation: A Manual of Recommended Practice. 20th Ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists.

8NIOSH [1992].

9Fairfield, C.L. and A.A. Beasley [1991]. In-depth Survey Report at the Association for Retarded Citizens, Meadowlands, PA. The Control of Methylene Chloride During Furniture Stripping. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health.

10Fairfield, C.L. [1991]. In-depth Survey Report at the J.M. Murray Center, Cortland, NY. The Control of Methylene Chloride During Furniture Stripping. Cincinnati, OH: U.S. Department of Health and Human Services, Publish Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health.

11Hall, R.M., K.F. Martinez, and P.A. Jensen [1992]. In-depth Survey Report at Tri-County Furniture Stripping and Refinishing, Cincinnati, OH. The Control of Methylene Chloride During Furniture Stripping. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health.

12Fairfield, C.L. and A.A. Beasley [1991]. In-depth Survey Report at the Association for Retarded Citizens, Meadowlands, PA. The Control of Methylene Chloride During Furniture Stripping. Cincinnati, OH: U.S. Department of Health and Human Service, Centers for Disease Control, National Institute for Occupational Safety and Health.

13Roder, M. [1991]. Memorandum of March 11, 1991 from Michael Roder of the Division of Safety Research to Cheryl L. Fairfield of the Division of Physical Sciences and Engineering, National Institute for Occupational Safety and Health, Centers for Disease Control, Public Health Service, U.S. Department of Health and Human Services.

14Kwick Kleen Industrial Solvents, Inc., [1981]. Operations Manual, Kwick Kleen Industrial Solvents, Inc., Vincennes, IN.

15ACGIH [1988].

16Ibid.

17Gerritsen, W.B. and C.H. Buschmann [1960]. Phosgene Poisoning Caused by the Use of Chemical Paint Removers containing Methylene Chloride in Ill-Ventilated Rooms Heated by Kerosene Stoves. British Journal of Industrial Medicine 17:187.



[Statutory Authority: RCW 49.17.040, [49.17].050 and [49.17].060. 97-18-062, § 296-62-07477, filed 9/2/97, effective 12/1/97.]



Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.

OTS-1873.3

AMENDATORY SECTION (Amending WSR 97-19-014, filed 9/5/97, effective 11/5/97)



WAC 296-62-07515  Control of chemical agents. Chemical agents shall be controlled in such a manner that the workers exposure shall not exceed the applicable limits in WAC 296-62-075 through 296-62-07515.





TABLE 1: LIMITS FOR AIR CONTAMINANTS



Permissible Exposure Limits (PEL)





TWA STEL((c/)) c CEILING Skin

Designation

Substance CAS((i/)) h

Number

 ppma((/)) _mg/m3b((/)) ppma((/)) _mg/m3b((/)) ppma((/)) _mg/m3b((/))
Abate, see Temephos ---- ---- ---- ---- ---- ---- ---- ----
Acetaldehyde 75-07-0 100 180 150 270 ---- ---- ----
Acetic acid 64-19-7 10 25 ---- ---- ---- ---- ----
Acetic anhydride 108-24-7 ---- ---- ---- ---- 5.0 20 ----
Acetone 67-64-1 750 1800 1000 2400 ---- ---- ----
Acetonitrile 75-05-8 40 70 60 105 ---- ---- ----
2-Acetylaminofluorene

(see WAC 296-62-073)

 53-96-3 ---- ---- ---- ---- ---- ---- ----
Acetylene 74-86-2 Simple Asphyxiant ---- ---- ---- ---- ----
Acetylene dichloride

(see 1,2-Dichloroethylene)

 ---- ---- ---- ---- ---- ---- ---- ----
Acetylene tetrabromide 79-27-6 1.0 14 ---- ---- ---- ---- ----
Acetylsalicylic acid

(Aspirin)

 50-78-2 ---- 5.0 ---- ---- ---- ---- ----
Acrolein 107-02-8 0.1 0.25 0.3 0.8 ---- ---- ----
Acrylamide 79-06-1 ---- 0.03 ---- ---- ---- ---- X
Acrylic acid 79-10-7 10 30 ---- ---- ---- ---- X
Acrylonitrile

(see WAC ((296-62-07341))

296-62-07336(3))

 107-13-1 ---- ---- ---- ---- ---- ---- ----
Aldrin 309-00-2 ---- 0.25 ---- ---- ---- ---- X
Allyl alcohol 107-18-6 2.0 5.0 4.0 10 ---- ---- X
Allyl Chloride 107-05-1 1.0 3.0 2.0 6.0 ---- ---- ----
Allyl glycidyl ether (AGE) 106-92-3 5.0 22 10 44 ---- ---- ----
Allyl propyl disulfide 2179-59-1 2.0 12 3.0 18 ---- ---- ----
alpha-Alumina

(see Aluminum oxide)

 1344-28-1 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- 5.0k ---- ---- ---- ---- ----
Aluminum, metal and

oxide (as Al)

 7429-90-5 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
pyro powders ---- ---- 5.0 ---- ---- ---- ---- ----
welding fumes ((f/)) f ---- ---- 5.0 ---- ---- ---- ---- ----
soluble salts ---- ---- 2.0 ---- ---- ---- ---- ----
alkyls (NOC) ---- ---- 2.0 ---- ---- ---- ---- ----
Alundum (see Aluminum oxide) ---- ---- ---- ---- ---- ---- ---- ----
4-Aminodiphenyl

(see WAC 296-62-073)

 92-67-1 ---- ---- ---- ---- ---- ---- ----
2-Aminoethanol

(see Ethanolamine)

 ---- ---- ---- ---- ---- ---- ---- ----
2-Aminopyridine 504-29-0 0.5 2.0 ---- ---- ---- ---- ----
Amitrole 61-82-5 ---- 0.2 ---- ---- ---- ---- ----
Ammonia 7664-41-7 25 18 35 27 ---- ---- ----
Ammonium chloride, fume 12125-02-9 ---- 10 ---- 20 ---- ---- ----
Ammonium sulfamate (Ammate) 7773-06-0 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
n-Amyl acetate 628-63-7 100 525 ---- ---- ---- ---- ----
sec-Amyl acetate 626-38-0 125 650 ---- ---- ---- ---- ----
Aniline and homologues 62-53-3 2.0 8.0 ---- ---- ---- ---- X
Anisidine (o, p-isomers) 29191-52-4 0.1 0.5 ---- ---- ---- ---- X
Anitmony and Compounds (as Sb) 7440-36-0 ---- 0.5 ---- ---- ---- ---- ----
ANTU

(alpha Naphthyl thiourea)

 86-88-4 ---- 0.3 ---- ---- ---- ---- ----
Argon 7440-37-1 Simple Asphyxiant ---- ---- ---- ---- ----
Arsenic,

Organic compounds (as As)

 7440-38-2 ---- 0.2 ---- ---- ---- ---- ----
Arsenic, Inorganic

compounds (as As) (when

use is covered by WAC

296-62-07347)

 7440-38-2 ---- 0.01 ---- ---- ---- ---- ----
Arsenic, Inorganic

compounds((,)) (as As)

(((see)) when use is not

covered by WAC

296-62-07347

((for applications and

exclusions)))

 7440-38-2 ---- 0.2 ---- ---- ---- ---- ----
Arsine 7784-42-1 0.05 0.2 ---- ---- ---- ---- ----
Asbestos

(see WAC 296-62-077

through 296-62-07753)

 ---- ---- ---- ---- ---- ---- ---- ----
Asphalt (Petroleum fumes) 8052-42-4 ---- 5.0 ---- ---- ---- ---- ----
Atrazine 1912-24-9 ---- 5.0 ---- ---- ---- ---- ----
Azinphos methyl 86-50-0 ---- 0.2 ---- ---- ---- ---- X
Barium, soluble

compounds (as Ba)

 7440-39-3 ---- 0.5 ---- ---- ---- ---- ----
Barium Sulfate 7727-43-7 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10.0 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Benomyl 17804-35-2 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- 0.8 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Benzene((,))

(see WAC

296-62-07523)((d/)) d

71-43-2 1.0 ---- 5.0 ---- ---- ---- ----
Benzidine((,))

(see WAC 296-62-073)

 92-87-5 ---- ---- ---- ---- ---- ---- ----
((p-Benzoquimone,)) p-Benzoquinone

(see Quinone)

 ---- ---- ---- ---- ---- ---- ---- ----
Benzo(a) pyrene((;))

(see Coal tar pitch volatiles)

 ---- ---- ---- ---- ---- ---- ---- ----
Benzoyl peroxide 94-36-0 ---- 5.0 ---- ---- ---- ---- ----
Benzyl chloride 100-44-7 1.0 5.0 ---- ---- ---- ---- ----
Beryllium and beryllium

compounds (as Be)

 7440-41-7 --- 0.002 --- 0.005

(30 min.)

 ---- 0.025 ---
Biphenyl (see Diphnyl) ---- ---- ---- ---- ---- ---- ---- ----
Bismuth telluride, Undoped 1304-82-1 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Bismuth telluride, Se-doped ---- ---- 5.0 ---- ---- ---- ---- ----
Borates, tetra, sodium salts((: ---- ---- ---- ---- ---- ---- ---- ----))
Anhydrous 1330-43-4 ---- 1.0 ---- ---- ---- ---- ----
Decahydrate 1303-96-4 ---- 5.0 ---- ---- ---- ---- ----
Pentahydrate 12179-04-3 ---- 1.0 ---- ---- ---- ---- ----
Boron oxide 1303-86-2 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Boron tribromide 10294-33-4 ---- ---- ---- ---- 1.0 10 ----
Boron trifluoride 7637-07-2 ---- ---- ---- ---- 1.0 3.0 ----
Bromacil 314-40-9 1.0 10 ---- ---- ---- ---- ----
Bromine 7726-95-6 0.1 0.7 0.3 2.0 ---- ---- ----
Bromine pentafluoride 7789-30-2 0.1 0.7 ---- ---- ---- ---- ----
Bromochloromethane((,))

(see Chlorobromethane)

 ---- ---- ---- ---- ---- ---- ---- ----
Bromoform 15-25-2 0.5 5.0 ---- ---- ---- ---- X
Butadiene

(1,3-butadiene)

 106-99-0 1 2.2 5 ---- ---- ---- ----
Butane 106-97-8 800 1,900 ---- ---- ---- ---- ----
Butanethiol

(see Butyl mercaptan)

 ---- ---- ---- ---- ---- ---- ---- ----
2-Butanone

(Methyl ethyl ketone)

 78-93-3 200 590 300 885 ---- ---- ----
2-Butoxy ethanol

(Butyl Cellosolve)

 111-76-2 25 120 ---- ---- ---- ---- X
n-Butyl acetate 123-86-4 150 710 200 950 ---- ---- ----
sec-Butyl acetate 105-46-4 200 950 ---- ---- ---- ---- ----
tert-Butyl acetate 540-88-5 200 950 ---- ---- ---- ---- ----
Butyl acrylate 141-32-2 10 55 ---- ---- ---- ---- ----
n-Butyl alcohol 71-36-3 ---- ---- ---- ---- 50 150 X
sec-Butyl alcohol 78-92-2 100 305 ---- ---- ---- ---- ----
tert-Butyl alcohol 75-65-0 100 300 150 450 ---- ---- ----
Butylamine 109-73-9 ---- ---- ---- ---- 5.0 15 X
tert-Butyl chromate

(see CrO3)

 1189-85-1 ---- ---- ---- ---- ---- 0.1 X
n-Butyl glycidyl ether (BGE) 2426-08-6 25 135 ---- ---- ---- ---- ----
n-Butyl lactate 138-22-7 5.0 25 ---- ---- ---- ---- ----
Butyl mercaptan 109-79-5 0.5 1.5 ---- ---- ---- ---- ----
o-sec-Butylphenol 89-72-5 5.0 30 ---- ---- ---- ---- X
p-tert-Butyl-toluene 98-51-1 10 60 20 120 ---- ---- ----
Cadmium oxide fume((,)) (as Cd)

(see WAC 296-62-074)

 1306-19-0 ---- ---- ---- ---- ---- -- ----
Cadmium dust and salts (as Cd)

(see WAC 296-62-074)

 7440-43-9 ---- --- ---- ---- ---- ---- ----
Calcium arsenate

(see WAC 296-62-07347)

 ---- ---- ---- ---- ---- ---- ---- ----
Calcium carbonate 1317-65-3 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Calcium cyanamide 156-62-7 ---- 0.5 ---- ---- ---- ---- ----
Calcium hydroxide 1305-62-0 ---- 5.0 ---- ---- ---- ---- ----
Calcium oxide 1305-78-8 ---- 2.0 ---- ---- ---- ---- ----
Calcium silicate 1344-95-2 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Calcium sulfate 7778-18-9 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Camphor (synthetic) 76-22-2 ---- 2.0 ---- ---- ---- ---- ----
Caprolactam((;)) 105-60-2 ((---- ---- ---- ---- ---- ---- ----))
Dust ---- ---- 1.0 ---- 3.0 ---- ---- ----
Vapor ---- 5.0 20 10 40 ---- ---- ----
Captafol

(Difolatan)

 2425-06-1 ---- 0.1 ---- ---- ---- ---- X
Captan 133-06-2 ---- 5.0 ---- ---- ---- ---- ----
Carbaryl (Sevin) 63-25-2 ---- 5.0 ---- ---- ---- ---- ----
Carbofuran (Furadon) 1563-66-2 ---- 0.1 ---- ---- ---- ---- ----
Carbon black 1333-86-4 ---- 3.5 ---- ---- ---- ---- ----
Carbon dioxide 124-38-9 5,000 9,000 30,000 54,000 ---- ---- ----
Carbon disulfide 75-15-0 4.0 12 12 36 ---- ---- X
Carbon monoxide 630-08-0 35 40 ---- ---- 200 ((m/))j 229 ((m/)) j ----
Carbon tetrabromide 558-13-4 0.1 1.4 0.3 4.0 ---- ---- ----
Carbon tetrachloride 56-23-5 2.0 12.6 ---- ---- ---- ---- ((---))X
Carbonyl chloride

(see Phosgene)

 ---- ---- ---- ---- ---- ---- ---- ----
Carbonyl fluoride 353-50-4 2.0 5.0 5.0 15 ---- ---- ----
Catechol (Pyrocatechol) 120-80-9 5.0 20 ---- ---- ---- ---- X
Cellulose (paper fiber) 9004-34-6 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Cesium hydroxide 21351-79-1 ---- 2.0 ---- ---- ---- ---- ----
Chlordane 57-74-9 ---- 0.5 ---- ---- ---- ---- X
Chlorinated camphene 8001-35-2 ---- 0.5 ---- 1.0 ---- ---- X
Chlorinated diphenyl oxide 55720-99-5 ---- 0.5 ---- ---- ---- ---- ----
Chlorine 7782-50-5 0.5 1.5 1.0 3.0 1.0 3.0 ----
Chlorine dioxide 10049-04-4 0.1 0.3 0.3 0.9 ---- ---- ----
Chlorine trifluoride 7790-91-2 ---- ---- ---- ---- 0.1 0.4 ----
Chloroacetaldehyde 107-20-0 ---- ---- ---- ---- 1.0 3.0 ----
a-Chloroacetophenone

(Phenacyl chloride)

 532-21-4 0.05 0.3 ---- ---- ---- ---- ----
Chloroacetyl chloride 79-04-9 0.05 0.2 ---- ---- ---- ---- ----
Chlorobenzene

(Monochlorobenzene)

 108-90-7 75 350 ---- ---- ---- ---- ----
o-Chlorobenzylidene

malononitrile (OCBM)

 2698-41-1 ---- ---- ---- ---- 0.05 0.4 X
Chlorobromomethane 74-97-5 200 1,050 ---- ---- ---- ---- ----
2-Chloro-1, 3-butadiene

(see beta-Chloroprene)

 ---- ---- ---- ---- ---- ---- ---- ----
Chlorodifluoromethane 75-45-6 1,000 3,500 ---- ---- ---- ---- ----
Chlorodiphenyl

(42% Chlorine) (PCB)

 53469-21-9 ---- 1.0 ---- ---- ---- ---- X
Chlorodiphenyl

(54% Chlorine) (PCB)

 11097-69-1 ---- 0.5 ---- ---- ---- ---- X
1-Chloro-2, 3-epoxypropane((,))

(see Epichlorhydrin)

 ---- ---- ---- ---- ---- ---- ---- ----
2-Chloroethanol

(see Ethylene chlorohydrin)

 ---- ---- ---- ---- ---- ---- ---- ----
Chloroethylene

(see vinyl chloride)

 ---- ---- ---- ---- ---- ---- ---- ----
Chloroform (Trichloromethane) 67-66-3 2.0 9.78 ---- ---- ---- ---- ----
1-Chloro-1-nitropropane 600-25-9 2.0 10 ---- ---- ---- ---- ----
bis-Chloromethyl ether

(see WAC 296-62-073)

 542-88-1 ---- ---- ---- ---- ---- ---- ----
Chloromethyl methyl ether

(see Methyl carbomethyl

ether)

 107-30-2 ---- ---- ---- ---- ---- ---- ----
Chloropentafluoroethane 76-15-3 1,000 6,320 ---- ---- ---- ---- ----
Chloropicrin 76-06-2 0.1 0.7 ---- ---- ---- ---- ----
beta-Chloroprene 126-99-8 10 35 ---- ---- ---- ---- X
o-Chlorostyrene 2039-87-4 50 285 75 428 ---- ---- ----
o-Chlorotoluene 95-49-8 50 250 ---- ---- ---- ---- ----
2-Chloro-6-trichloromethyl

pyridine (see Nitrapyrin)

 1929-82-4 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Chlorpyrifos 2921-88-2 ---- 0.2 ---- ---- ---- ---- X
Chromic acid and chromates

(as CrO3)

 Varies ((w/)) with Compounds ---- ((0.1))

----

 ---- ---- ---- ((----))

0.1

 ----
Chromium, sol, chromic,

chromous salts (as Cr)



7440-47-3

----

0.5

----

----

----

----

----
Chromium (VI) compounds

(as Cr)

 ---- ---- 0.05 ---- ---- ---- ---- ----
Chromium Metal

and insoluble salts



7440-47-3

----

0.5

----

----

----

----

----
Chromyl chloride 14977-61-8 0.025 0.15 ---- ---- ---- ---- ----
Chrysene((:)) (see Coal tar

pitch volatiles)

 ---- ---- ---- ---- ---- ---- ---- ----
Clopidol 2971-90-6 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Coal dust (less than 5% SiO2)

Respirable fraction

 ---- ---- 2.0g ---- ---- ---- ---- ----
Coal dust (greater than or

equal to 5% SiO2)

Respirable fraction

 ---- ---- 0.1g ---- ---- ---- ---- ----
Coal tar pitch volatiles

(benzene soluble fraction anthracene, BaP, phenanthrene, acridine, chrysene, pyrene)

 65996-93-2 ---- 0.2 ---- ---- ---- ---- ----
Cobalt, metal fume & dust((,))

(as Co)

 7440-48-4 ---- 0.05 ---- ---- ---- ---- ----
Cobalt carbonyl (as Co) 10210-68-1 ---- 0.1 ---- ---- ---- ---- ----
Cobalt hydrocarbonyl (as Co) 16842-03-8 ---- 0.1 ---- ---- ---- ---- ----
Coke oven emissions

(see WAC 296-62-200)

 ---- ---- ---- ---- ---- ---- ---- ----
Copper fume

(as Cu)

 7440-50-8 ---- 0.1 ---- ---- ---- ---- ----
Dusts and mists (as Cu) ---- ---- 1.0 ---- ---- ---- ---- ----
Cotton dust (raw)(( e/)) e ---- ---- 1.0 ---- ---- ---- ---- ----
Corundum((,)) (see Aluminum oxide) ---- ---- ---- ---- ---- ---- ---- ----
Crag herbicide (Sesone) 136-78-7 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Cresol (all isomers) 1319-77-3 5.0 22 ---- ---- ---- ---- X
Crotonaldehyde

 123-73-9;

4170-30-3

 2.0 6.0 ---- ---- ---- ---- ----
Crufomate 299-86-5 ---- 5.0 ---- ---- ---- ---- ----
Cumene 98-82-8 50 245 ---- ---- ---- ---- X
Cyanamide 420-04-2 ---- 2.0 ---- ---- ---- ---- ----
Cyanide (as CN) Varies with Compound ---- 5.0 ---- ---- ---- ---- X
Cyanogen 460-19-5 10 20 ---- ---- ---- ---- ----
Cyanogen chloride 506-77-4 ---- ---- ---- ---- 0.3 0.6 ----
Cyclohexane 110-82-7 300 1,050
Cyclohexanol 108-93-0 50 200 ---- ---- ---- ---- X
Cyclohexanone 108-94-1 25 100 ---- ---- ---- ---- X
Cyclohexene 110-83-8 300 1,015 ---- ---- ---- ---- ----
Cyclohexylamine 108-91-8 10 40 ---- ---- ---- ---- ----
Cyclonite (see RDX) 121-82-4 ---- 1.5 ---- ---- ---- ---- X
Cyclopentadiene 542-92-7 75 200 ---- ---- ---- ---- ----
Cyclopentane 287-92-3 600 1,720 ---- ---- ---- ---- ----
Cyhexatin 13121-70-5 ---- 5.0
2,4-D (Dichlorophenoxy-

acetic acid)

 94-75-7 ---- 10 ---- ---- ---- ---- ----
DDT (Dichlorodiphenyltri-

chloroethane)

 50-29-3 ---- 1.0 ---- ---- ---- ---- X
DDVP, Dichlorvos 62-73-7 0.1 1.0 ---- ---- ---- ---- X
Decaborane 17702-41-9 0.05 0.3 0.15 0.9 ---- ---- X
Demeton 8065-48-3 0.01 0.1 ---- ---- ---- ---- X
Diacetone alcohol

(4-hydroxy-4-methyl-

2-pentanone)

 123-42-2 50 240 ---- ---- ---- ---- ----
1, 2-Diaminoethane

(see Ethylenediamine)

 ---- ---- ---- ---- ---- ---- ---- ----
Diazinon 333-41-5 ---- 0.1 ---- ---- ---- ---- X
Diazomethane 334-88-3 0.2 0.4 ---- ---- ---- ---- ----
Diborane 19287-45-7 0.1 0.1 ---- ---- ---- ---- ----
Dibrom((,)) (see Naled) ---- ---- ---- ---- ---- ---- ---- ----
1, 2-Dibromo-3-chloropropane

(DBCP)

(see WAC ((296-62-07345))

296-62-07342)

 96-12-8 ---- ---- ---- ---- ---- ---- ----
2-N-Dibutylamino ethanol 102-81-8 2.0 14 ---- ---- ---- ---- X
Dibutyl phosphate 107-66-4 1.0 5.0 2.0 10 ---- ---- ----
Dibutyl phthalate 84-74-2 ---- 5.0 ---- ---- ---- ---- ----
Dichloroacetylene 7572-29-4 ---- ---- ---- ---- 0.1 0.4 ----
o-Dichlorobenzene 95-50-1 ---- ---- ---- ---- 50 300 ----
p-Dichlorobenzene 106-46-7 75 450 110 675 ---- ---- ----
3, 3'-Dichlorobenzidine

(see WAC 296-62-073)

 91-94-1 ---- ---- ---- ---- ---- ---- ----
Dichlorodifluoromethane 75-71-8 1,000 4,950 ---- ---- ---- ---- ----
1, 3-Dichloro-5, 5-dimethyl

hydantoin

 118-52-5 ---- 0.2 ---- 0.4 ---- ---- ----
1, 1-Dichloroethane 75-34-3 100 400 ---- ---- ---- ---- ----
1, 2-Dichloroethane

(see Ethylene dichloride)

 ---- ---- ---- ---- ---- ---- ---- ----
1, 2-Dichloroethylene 540-59-0 200 790 ---- ---- ---- ---- ----
1, 1-Dichloroethylene

(see Vinylidene chloride)

 ---- ---- ---- ---- ---- ---- ---- ----
Dichloroethyl ether 111-44-4 5.0 30 10 60 ---- ---- X
Dichlorofluoromethane 75-43-4 10 40 ---- ---- ---- ---- ----
Dichloromethane

(see Methylene chloride)

 ---- ---- ---- ---- ---- ---- ---- ----
1, 1-Dichloro-1-nitroethane 594-72-9 2.0 10. 10. ---- ---- ---- ----
1, 2-Dichloropropane

(see Propylene dichloride)

 ---- ---- ---- ---- ---- ---- ---- ----
Dichloropropene 542-75-6 1.0 5.0 ---- ---- ---- ---- X
2, 2-Dichloropropionic acid 75-99-0 1.0 6.0 ---- ---- ---- ---- ----
Dichlorotetrafluoroethane 76-14-2 1,000 7,000 ---- ---- ---- ---- ----
Dichlorvos (DDVP) 62-73-7 0.1 1.0 ---- ---- ---- ---- X
Dicrotophos 141-66-2 ---- 0.25 ---- ---- ---- ---- X
Dicyclopentadiene 77-73-6 5.0 30 ---- ---- ---- ---- ----
Dicyclopentadienyl iron 102-54-5 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Dieldrin 60-57-1 ---- 0.25 ---- ---- ---- ---- X
Diethanolamine 111-42-2 3.0 15 ---- ---- ---- ---- ----
Diethylamine 109-89-7 10 30 25 75 ---- ---- ----
2-Diethylaminoethanol 100-37-8 10 50 ---- ---- ---- ---- X
Diethylene triamine 111-40-0 1.0 4.0 ---- ---- ---- ---- X
Diethyl ether (see Ethyl ether) ---- ---- ---- ---- ---- ---- ---- ----
Diethyl ketone 96-22-0 200 705 ---- ---- ---- ---- ----
Diethyl phthalate 84-66-2 ---- 5.0 ---- ---- ---- ---- ----
Difluorodibromomethane 75-61-6 100 860 ---- ---- ---- ---- ----
Diglycidyl ether (DGE) 2238-07-5 0.1 0.5 ---- ---- ---- ---- ----
Dihydroxybenzene

(see Hydroquinone)

 ---- ---- ---- ---- ---- ---- ---- ----
Diisobutyl ketone 108-83-8 25 150 ---- ---- ---- ---- ----
Diisopropylamine 108-18-9 5.0 20 ---- ---- ---- ---- X
Dimethoxymethane (see Methylal) ---- ---- ---- ---- ---- ---- ---- ----
Dimethyl acetamide 127-19-5 10 35 ---- ---- ---- ---- X
Dimethylamine 124-40-3 10 18 ---- ---- ---- ---- ----
4-Dimethylaminoazobenzene

(see WAC 296-62-073)

 60-11-7 ---- ---- ---- ---- ---- ---- ----
Dimethylaminobenzene

(see Xylidene)

 ---- ---- ---- ---- ---- ---- ---- ----
Dimethylaniline

(N, N-Dimethylaniline)

 121-69-7 5.0 25 10 50 ---- ---- X
Dimethylbenzene (see Xylene) ---- ---- ---- ---- ---- ---- ---- ----
Dimethyl-1, 2-dibromo-2,

2-dichloroethyl phosphate

(see Naled)

 300-76-5 ---- 3.0 ---- ---- ---- ---- X
Dimethylformamide 68-12-2 10 30 ---- ---- ---- ---- X
2, 6-Dimethylheptanone

(see Diisobutyl ketone)

 ---- ---- ---- ---- ---- ---- ---- ----
1, 1-Dimethylhydrazine 57-14-7 0.5 1.0 ---- ---- ---- ---- X
Dimethyl phthalate 131-11-3 ---- 5.0 ---- ---- ---- ---- ----
Dimethyl sulfate 77-78-1 0.1 0.5 ---- ---- ---- ---- X
Dinitolmide 148-01-6 ---- 5.0 ---- ---- ---- ---- ----
(3, 5-Dinitro-o-toluamide) ((---- ---- 5.0 ---- ---- ---- ---- ----))
Dinitrobenzene (all isomers) (alpha) 528-29-0;

(meta) 99-65-0;

(para) 100-25-4

 0.15 1.0 ---- ---- ---- ---- X
Dinitro-o-cresol 534-52-1 ---- 0.2 ---- ---- ---- ---- X
Dinitrotoluene 25321-14-6 ---- 1.5 ---- ---- ---- ---- X
Dioxane (Diethylene dioxide) 123-91-1 25 90 ---- ---- ---- ---- X
Dioxathion 78-34-2 ---- 0.2 ---- ---- ---- ---- X
Diphenyl (Biphenyl) 92-52-4 0.2 1.0 ---- ---- ---- ---- ----
Diphenylamine 122-39-4 ---- 10 ---- ---- ---- ---- ----
Diphenylmethane diisocyanate

(see Methylene bisphenyl isocyanate (MDI))

 ---- ---- ---- ---- ---- ---- ---- ----
Dipropylene glycol methyl ether 34590-94-8 100 600 150 900 ---- ---- X
Dipropyl ketone 123-19-3 50 235 ---- ---- ---- ---- ----
Diquat 85-00-7 ---- 0.5 ---- ---- ---- ---- ----
Di-sec, Octyl phthalate

(Di-2-ethylhexylphthalate)

 117-81-7 ---- 5.0 ---- 10 ---- ---- ----
Disulfram 97-77-8 ---- 2.0 ---- ---- ---- ---- ----
Disulfoton 298-04-4 ---- 0.1 ---- ---- ---- ---- X
2, 6-Di-tert-butyl-p-cresol 128-37-0 ---- 10 ---- ---- ---- ---- ----
Diuron 330-54-1 ---- 10 ---- ---- ---- ---- ----
Divinyl benzene 1321-74-0 10 50 ---- ---- ---- ---- ----
Emery 12415-34-8 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Endosulfan (Thiodan) 115-29-7 ---- 0.1 ---- ---- ---- ---- X
Endrin 72-20-8 ---- 0.1 ---- ---- ---- ---- X
Epichlorhydrin 106-89-8 2.0 8.0 ---- ---- ---- ---- X
EPN 2104-64-5 ---- 0.5 ---- ---- ---- ---- X
1, 2-Epoxypropane

(see Propylene oxide)

 ---- ---- ---- ---- ---- ---- ---- ----
2, 3-Epoxy-1-propanol

(see Glycidol)

 ---- ---- ---- ---- ---- ---- ---- ----
Ethane ---- Simple Asphyxiant ---- ---- ---- ---- ----
Ethanethiol

(see Ethyl mercaptan)

 ---- ---- ---- ---- ---- ---- ---- ----
Ethanolamine 141-43-5 3.0 8.0 6.0 15 ---- ---- ----
Ethion 563-12-2 ---- 0.4 ---- ---- ---- ---- X
2-Ethoxyethanol 110-80-5 5.0 19 ---- ---- ---- ---- X
2-Ethoxyethyl acetate

(Cellosolve acetate)

 111-15-9 5.0 27 ---- ---- ---- ---- X
Ethyl acetate 141-78-6 400 1,400 ---- ---- ---- ---- ----
Ethyl acrylate 140-88-5 5.0 20 25 100 ---- ---- X
Ethyl alcohol (ethanol) 64-17-5 1,000 1,900 ---- ---- ---- ---- ----
Ethylamine 75-04-07 10 18 ---- ---- ---- ---- ----
Ethyl amyl ketone

(5-Methyl-3-hepatone)

 541-85-5 25 130 ---- ---- ---- ---- ----
Ethyl benzene 100-41-4 100 435 125 545 ---- ---- ----
Ethyl bromide 74-96-4 200 890 250 1,110 ---- ---- ----
Ethyl butyl ketone

(3-Heptanone)

 106-35-4 50 230 ---- ---- ---- ---- ----
Ethyl chloride 75-00-3 1,000 2,600 ---- ---- ---- ---- ----
Ethylene 74-85-1 Simple Asphyxiant ---- ---- ---- ---- ----
Ethylene chlorohydrin 107-07-3 ---- ---- ---- ---- 1.0 3.0 X
Ethylenediamine 107-15-3 10 25 ---- ---- ---- ---- X
Ethylene dibromide 106-93-4 0.1 ---- 0.5 ---- ---- ---- ----
Ethylene dichloride 107-06-2 1.0 4.0 2.0 8.0 ---- ---- ----
Ethylene glycol 107-21-1 ---- ---- ---- ---- 50 125 ----
Ethylene glycol dinitrate 628-96-6 ---- ---- ---- 0.1 ---- ---- X
Ethylene glycol monomethyl ether

acetate (Methyl cellosolve acetate)

 ---- 5.0 24 ---- ---- ---- ---- X
Ethyleneimine

(see WAC 296-62-073)

 151-56-4 ---- ---- ---- ---- ---- ---- X
Ethylene oxide

(see WAC ((296-62-07353))

296-62-07359)

 75-21-8 1.0 2.0 ---- ---- ---- ---- ----
Ethyl ether 60-29-7 400 1,200 500 1,500 ---- ---- ----
Ethyl formate 109-94-4 100 300 ---- ---- ---- ---- ----
Ethylidine chloride

(see 1, 1-Dichloroethane)

 ---- ---- ---- ---- ---- ---- ---- ----
Ethylidene norbornene 16219-75-3 ---- ---- ---- ---- 5.0 25 ----
Ethyl mercaptan 75-08-1 0.5 1.0 ---- ---- ---- ---- ----
n-Ethylmorpholine 100-74-3 5.0 23 ---- ---- ---- ---- X
Ethyl sec-amyl ketone

(5-methyl-3-heptanone)

 ---- 25 130 ---- ---- ---- ---- ----
Ethyl silicate 78-10-4 10 85 ---- ---- ---- ---- ----
Fenamiphos 22224-92-6 ---- 0.1 ---- ---- ---- ---- X
Fensulfothion (Dasanit) 115-90-2 ---- 0.1 ---- ---- ---- ---- ----
Fenthion 55-38-9 ---- 0.2 ---- ---- ---- ---- X
Ferbam 14484-64-1 ---- ---- ---- ---- ---- ---- ----
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Ferrovanadium dust 12604-58-9 ---- 1.0 ---- 3.0 ---- ---- ----
Fluorides (as F) Varies ((w/)) with compound ---- 2.5 ---- ---- ---- ---- ----
Fluorine 7782-41-4 0.1 0.2 ---- ---- ---- ---- ----
Fluorotrichloromethane

(see Trichlorofluoro methane)

 75-69-4 ---- ---- ---- ---- 1,000 5,600 ----
Fonofos 944-22-9 ---- 0.1 ---- ---- ---- ---- X
Formaldehyde

(see WAC 296-62-07540)

 50-00-0 0.75 ---- 2.0 ---- ---- ---- ----
Formamide 75-12-7 20 30 30 45 ---- ---- ----
Formic acid 64-18-6 5.0 9.0 ---- ---- ---- ---- ----
Furfural 98-01-1 2.0 8.0 ---- ---- ---- ---- X
Furfuryl alcohol 98-00-0 10 40 15 60 ---- ---- X
Gasoline 8006-61-9 300 900 500 1,500 ---- ---- ----
Germanium tetrahydride 7782-65-2 0.2 0.6 ---- ---- ---- ---- ----
Glass, fibrous or dust ---- ---- 10 ---- ---- ---- ---- ----
Gluteraldehyde 111-30-8 ---- ---- ---- ---- 0.2 0.8 ----
Glycerin mist 56-81-5 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Glycidol

(2, 3-Epoxy-1-propanol)

 556-52-5 25 75 ---- ---- ---- ---- ----
Glycol monoethyl ether

(see 2-Ethoxyethanol)

 ---- ---- ---- ---- ---- ---- ---- ----
Grain dust (oat, wheat, barley) ---- ---- 10 ---- ---- ---- ---- ----
Graphite, natural 7782-42-5 ((---- ---- ---- ---- ---- ---- ----))
Respirable dust ---- ---- 2.5k ---- ---- ---- ---- ----
Graphite, Synthetic ((---- ---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Guthion

(see Azinphosmethyl)

 ---- ---- ---- ---- ---- ---- ---- ----
Gypsum 13397-24-5 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Hafnium 7440-58-6 ---- 0.5 ---- ---- ---- ---- ----
Helium ---- Simple Asphyxiant ---- ---- ---- ---- ----
Heptachlor 76-44-8 ---- 0.5 ---- ---- ---- ---- X
Heptane (n-heptane) 142-82-5 400 1,600 500 2,000 ---- ---- ----
2-Heptanone((,))

(see Methyl n-amyl ketone)

 ---- ---- ---- ---- ---- ---- ---- ----
3-Heptanone

(see Ethyl butyl ketone)

 ---- ---- ---- ---- ---- ---- ---- ----
Hexachlorobutadiene 87-68-3 0.02 0.24 ---- ---- ---- ---- X
Hexachlorocyclopentadiene 77-47-4 0.01 0.1 ---- ---- ---- ---- ----
Hexachloroethane 67-72-1 1.0 10 ---- ---- ---- ---- X
Hexachloronaphthalene 1335-87-1 ---- 0.2 ---- ---- ---- ---- X
Hexafluoroacetone 684-16-2 0.1 0.7 ---- ---- ---- ---- X
Hexane ((---- ---- ---- ---- ---- ---- ---- ----))
n-hexane 110-54-3 50 180 ---- ---- ---- ---- ----
other Isomers Varies ((w/)) with compound 500 1,800 1,000 3,600 ---- ---- ----
2-Hexanone

(Methyl-n-butyl ketone)

 591-78-6 5.0 20 ---- ---- ---- ---- ----
Hexone

(Methyl isobutyl ketone)

 108-10-1 50 205 75 300 ---- ---- ----
sec-Hexyl acetate 108-84-9 50 300 ---- ---- ---- ---- ----
Hexylene Glycol 107-41-5 ---- ---- ---- ---- 25 125 ----
Hydrazine 302-01-2 0.1 0.1 ---- ---- ---- ---- X
Hydrogen ---- Simple Asphyxiant ---- ---- ---- ---- ----
Hydrogenated terphenyls 61788-32-7 0.5 5.0 ---- ---- ---- ---- ----
Hydrogen bromide 10035-10-6 ---- ---- ---- ---- 3.0 10 ----
Hydrogen chloride 7647-01-0 ---- ---- ---- ---- 5.0 7.0 ----
Hydrogen cyanide 74-90-8 ---- ---- 4.7 5.0 ---- ---- X
Hydrogen fluoride 7664-39-3 ---- ---- ---- ---- 3.0 2.5 ----
Hydrogen peroxide 7722-84-1 1.0 1.4 ---- ---- ---- ---- ----
Hydrogen selenide (as Se) 7783-07-5 0.05 0.2 ---- ---- ---- ---- ----
Hydrogen Sulfide 7783-06-4 10 14 15 21 ---- ---- ----
Hydroquinone 123-31-9 ---- 2.0 ---- ---- ---- ---- ----
4-Hydroxy-4-methyl-2-pentanone

(see Diacetone alcohol)

 ---- ---- ---- ---- ---- ---- ---- ----
2-Hydroxypropyl acrylate 999-61-1 0.5 3.0 ---- ---- ---- ---- X
Indene 95-13-6 10 45 ---- ---- ---- ---- ----
Indium and compounds (as In) 7440-74-6 ---- 0.1 ---- ---- ---- ---- ----
Iodine 7553-56-2 ---- ---- ---- ---- 0.1 1.0 ----
Iodoform 75-47-8 0.6 10 ---- ---- ---- ---- ----
Iron oxide dust and fume (as Fe) 1309-37-1 ((---- ---- ---- ---- ---- ---- ----))
Total particulate ---- ---- 5.0 ---- ---- ---- ---- ----
Iron pentacarbonyl (as Fe) 13463-40-6 0.1 0.8 0.2 1.6 ---- ---- ----
Iron salts, soluble (as Fe) Varies ((w/)) with compound ---- 1.0 ---- ---- ---- ---- ----
Isoamyl acetate 123-92-2 100 525 ---- ---- ---- ---- ----
Isoamyl alcohol

(primary and secondary)

 123-51-3 100 360 125 450 ---- ---- ----
Isobutyl acetate 110-19-0 150 700 ---- ---- ---- ---- ----
Isobutyl alcohol 78-83-1 50 150 ---- ---- ---- ---- ----
Isooctyl alcohol 26952-21-6 50 270 ---- ---- ---- ---- X
Isophorone 78-59-1 4.0 23 ---- ---- 5.0 25 ----
Isophorone diisocyanate 4098-71-9 0.005 0.045 0.02 ---- ---- ---- X
Isopropoxyethanol 109-59-1 25 105 ---- ---- ---- ---- ----
Isopropyl acetate 108-21-4 250 950 310 1,185 ---- ---- ----
Isopropyl alcohol 67-63-0 400 980 500 1,225 ---- ---- ----
Isopropylamine 75-31-0 5.0 12 10 24 ---- ---- ----
N-Isopropylaniline 768-52-5 2.0 10 ---- ---- ---- ---- X
Isopropyl ether 108-20-3 250 1,050 ---- ---- ---- ---- ----
Isopropyl glycidyl ether (IGE) 4016-14-2 50 240 75 360 ---- ---- ----
Kaolin
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Ketene 463-51-4 0.5 0.9 1.5 3.0 ---- ---- ----
Lead inorganic (as Pb)

(see WAC 296-62-07521)

 7439-92-1 ---- 0.05 ---- ---- ---- ---- ----
Lead arsenate

(see WAC 296-62-07347)

 3687-31-8 ---- 0.05 ---- ---- ---- ---- ----
Lead chromate 7758-97-6 ---- 0.05 ---- ---- ---- ---- ----
Limestone 1317-65-3
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Lindane 58-89-9 ---- 0.5 ---- ---- ---- ---- X
Lithium hydride 7580-67-8 ---- 0.025 ---- ---- ---- ---- ----
L.P.G.

(liquified petroleum gas)

 68476-85-7 1,000 1,800 ---- ---- ---- ---- ----
Magnesite 546-93-0
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Magnesium oxide fume 1309-48-4 ((---- ---- ---- ---- ---- ---- ----))
Total particulate ---- ---- 10 ---- ---- ---- ---- ----
Malathion 121-75-5
Total dust ---- ---- 10 ---- ---- ---- ---- X
Maleic anhydride 108-31-6 0.25 1.0 ---- ---- ---- ---- ----
Manganese and compound (as Mn) 7439-96-5 ---- ---- ---- ---- ---- 5.0 ----
Manganese tetroxide and fume

(as Mn)

 7439-96-5 ---- 1.0 ---- 3.0 ---- ---- ----
Manganese cyclopentadienyl

tricarbonyl (as Mn)

 12079-65-1 ---- 0.1 ---- ---- ---- ---- X
Manganese tetroxide (as Mn) 1317-35-7 ---- 1.0 ---- ---- ---- ---- ----
Marble 1317-65-3
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Mercury (aryl and inorganic)

(as Hg)

 7439-97-6 ---- ((0.1))

----

 ---- ---- ---- ((----))

0.1

 X
Mercury (organo-alkyl compounds)

(as Hg)

 7439-97-6 ---- 0.01 ---- 0.03 ---- ---- X
Mercury (vapor) (as Hg) 7439-97-6 ---- 0.05 ---- ---- ---- ---- X
Mesityl oxide 141-79-7 15 60 25 100 ---- ---- ----
Methacrylic acid 79-41-4 20 70 ---- ---- ---- ---- X
Methane ---- Simple Asphyxiant ---- ---- ---- ---- ----
Methanethiol

(see Methyl mercaptan)

 ---- ---- ---- ---- ---- ---- ---- ----
Methomyl (lannate) 16752-77-5 ---- 2.5 ---- ---- ---- ---- ----
Methoxychlor 72-43-5
Total dust ---- ---- 10 ---- ---- ---- ---- ----
2-Methoxyethanol

(Methyl cellosolve)

 109-86-4 5.0 16 ---- ---- ---- ---- X
4-Methoxyphenol 150-76-5 ---- 5.0 ---- ---- ---- ---- ----
Methyl acetate 79-20-9 200 610 250 760 ---- ---- ----
Methyl acetylene (propyne) 74-99-7 1,000 1,650 ---- ---- ---- ---- ----
Methyl acetylene-propadiene

mixture (MAPP)

 ---- 1,000 1,800 1,250 2,250 ---- ---- ----
Methyl acrylate 96-33-3 10 35 ---- ---- ---- ---- X
Methylacrylonitrile 126-98-7 1.0 3.0 ---- ---- ---- ---- X
Methylal (Dimethoxy-methane) 109-87-5 1,000 3,100 ---- ---- ---- ---- ----
Methyl alcohol (methanol) 67-56-1 200 260 250 325 ---- ---- X
Methylamine 74-89-5 10 12 ---- ---- ---- ---- ----
Methyl amyl alcohol

(see Methyl isobutyl carbinol)

 ---- ---- ---- ---- ---- ---- ---- ----
Methyl n-amyl ketone

(2-Heptanone)

 110-43-0 50 235 ---- ---- ---- ---- ----
N-Methyl aniline

(see Monomethyl aniline)

 ---- ---- ---- ---- ---- ---- ---- ----
Methyl bromide 74-83-9 5.0 20 ---- ---- ---- ---- X
Methyl butyl ketone

(see 2-Hexanone)

 ---- ---- ---- ---- ---- ---- ---- ----
Methyl cellosolve

(see 2-Methoxyethanol)

 109-86-4 5.0 16 ---- ---- ---- ---- X
Methyl cellosolve acetate

(2-Methoxyethyl acetate)

 110-49-6 5.0 24 ---- ---- ---- ---- X
Methyl chloride 74-87-3 50 105 100 210 ---- ---- ----
Methyl chloroform

(1, 1, 1-trichlorethane)

 71-55-6 350 1,900 450 2,450 ---- ---- ----
Methyl chloromethyl ether

(see WAC 296-62-073)

 107-30-2 ---- ---- ---- ---- ---- ---- ----
Methyl 2-cyanoacrylate 137-05-3 2.0 8.0 4.0 16 ---- ---- ----
Methylcyclohexane 108-87-2 400 1,600 ---- ---- ---- ---- ----
Methylcyclohexanol 25639-42-3 50 235 ---- ---- ---- ---- ----
Methylcyclohexanone 583-60-8 50 230 75 345 ---- ---- X
Methylcyclopentadienyl

manganese tricarbonyl (as Mn)

 12108-13-3 ---- 0.2 ---- ---- ---- ---- X
Methyl demeton 8022-00-2 ---- 0.5 ---- ---- ---- ---- X
Methylene bisphenyl isocyanate

(MDI)

 101-68-8 ---- ---- ---- ---- 0.02 0.2 ----
4, 4'-Methylene bis

(2-chloroaniline (MBOCA))

(see WAC 296-62-073)

 101-14-4 0.02 0.22 ---- ---- ---- ---- X
Methylene bis

(4-cyclohexylisocyanate)

 5124-30-1 ---- ---- ---- ---- 0.01 0.11 ----
Methylene chloride 75-09-2 100 ---- 500 ---- ---- ---- ----
4, 4-Methylene dianiline 101-77-9 0.1 0.8 ---- ---- ---- ---- X
Methyl ethyl ketone (MEK)

(see 2-Butanone)

 78-93-3 ---- ---- ---- ---- ---- ---- ----
Methyl ethyl ketone peroxide

(MEKP)

 1338-23-4 ---- ---- ---- ---- 0.2 1.5 ----
Methyl formate 107-31-3 100 250 150 375 ---- ---- ----
5-Methyl-3-heptanone

(see Ethyl amyl ketone)

 ---- ---- ---- ---- ---- ---- ---- ----
Methyl hydrazine

(see Monomethyl hydrazine)

 60-34-4 ---- ---- ---- ---- 0.2 0.35 X
Methyl iodide 74-88-4 2.0 10 ---- ---- ---- ---- X
Methyl isoamyl ketone 110-12-3 50 240 ---- ---- ---- ---- ----
Methyl isobutyl carbinol 108-11-2 25 100 40 165 ---- ---- X
Methyl isobutyl ketone

(see Hexone)

 ---- ---- ---- ---- ---- ---- ---- ----
Methyl isocyanate 624-83-9 0.02 0.05 ---- ---- ---- ---- X
Methyl isopropyl ketone 563-80-4 200 705 ---- ---- ---- ---- ----
Methyl mercaptan 74-93-1 0.5 1.0 ---- ---- ---- ---- ----
Methyl methacrylate 80-62-6 100 410 ---- ---- ---- ---- ----
Methyl parathion 298-00-0 ---- 0.2 ---- ---- ---- ---- X
Methyl propyl ketone

(see 2-Pentanone)

 ---- ---- ---- ---- ---- ---- ---- ----
Methyl silicate 684-84-5 1.0 6.0 ---- ---- ---- ---- ----
alpha-Methyl styrene 98-83-9 50 240 100 485 ---- ---- ----
Mevinphos (see Phosdrin) ---- ---- ---- ---- ---- ---- ---- ----
Metribuzin 21087-64-9 ---- 5.0 ---- ---- ---- ---- ----
Mica (see Silicates) ---- ---- ---- ---- ---- ---- ---- ----
Molybdenum (as Mo) 7439-98-7 ((---- ---- ---- ---- ---- ---- ----))
Soluble compounds ---- ---- 5.0 ---- ---- ---- ---- ----
Insoluble compounds
Total dust ---- ---- ---- 10 ---- ---- ---- ----
Monocrotophos (Azodrin) 6923-22-4 ---- 0.25 ---- ---- ---- ---- ----
Monomethyl aniline 100-61-8 0.5 2.0 ---- ---- ---- ---- X
Monomethyl hydrazine ---- ---- ---- ---- ---- 0.2 0.35 ----
Morpholine 110-91-8 20 70 30 105 ---- ---- X
Naled 300-76-5 ---- 3.0 ---- ---- ---- ---- X
Naphtha (Coal tar) 8030-30-6 100 400 ---- ---- ---- ---- X
Naphthalene 91-20-3 10 50 15 75 ---- ---- ----
alpha-Naphthylamine

(see WAC 296-62-073)

 134-32-7 ---- ---- ---- ---- ---- ---- ----
beta-Naphthylamine

(see WAC 296-62-073)

 91-59-8 ---- ---- ---- ---- ---- ---- ----
Neon 7440-01-9 Simple Asphyxiant ---- ---- ---- ---- ----
Nickel carbonyl (as Ni) 13463-39-3 0.001 0.007 ---- ---- ---- ---- ----
((Nickle,)) Nickel (as Ni) 7440-02-0
Metal and insoluble

compounds

 ---- 1.0 ---- ---- ---- ---- ----
Soluble compounds ---- 0.1 ---- ---- ---- ---- ----
Nicotine 54-11-5 ---- 0.5 ---- ---- ---- ---- X
Nitrapyrin

(see 2-Chloro-6

trichloromethyl pyridine)

 1929-82-4 ---- ---- ---- ---- ---- ---- ----
Total dust ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- 5.0k ---- ---- ---- ---- ----
Nitric acid 7697-37-2 2.0 5.0 4.0 10 ---- ---- ----
Nitric oxide 10102-43-9 25 30 ---- ---- ---- ---- ----
p-Nitroaniline 100-01-6 ---- 3.0 ---- ---- ---- ---- X
Nitrobenzene 98-95-3 1.0 5.0 ---- ---- ---- ---- X
4-Nitrobiphenyl

(see WAC 296-62-073)

 92-93-3 ---- ---- ---- ---- ---- ---- ----
p-Nitrochlorobenzene 100-00-5 ---- 0.5 ---- ---- ---- ---- X
4-Nitrodiphenyl

(see WAC 296-62-073)

 ---- ---- ---- ---- ---- ---- ---- ----
Nitroethane 79-24-3 100 310 ---- ---- ---- ---- ----
Nitrogen 7727-37-9 Simple Asphyxiant ---- ---- ---- ---- ----
Nitrogen dioxide 10102-44-0 ---- ---- 1.0 1.8 ---- ---- ----
Nitrogen trifluoride 7783-54-2 10 29 ---- ---- ---- ---- ----
Nitroglycerin 55-63-0 ---- ---- ---- 0.1 ---- ---- X
Nitromethane 75-52-5 100 250 ---- ---- ---- ---- ----
1-Nitropropane 108-03-2 25 90 ---- ---- ---- ---- ----
2-Nitropropane 79-46-9 10 35 ---- ---- ---- ---- ----
N-Nitrosodimethylamine

(see WAC 296-62-073)

 62-75-9 ---- ---- ---- ---- ---- ---- ----
Nitrotoluene((:))
o-isomer 88-72-2 2.0 11 ---- ---- ---- ---- X
m-isomer 98-08-2 2.0 11 ---- ---- ---- ---- X
p-isomer 99-99-0 2.0 11 ---- ---- ---- ---- X
Nitrotirchloromethane

(see Chloropicrin)

 ---- ---- ---- ---- ---- ---- ---- ----
Nitrous Oxide

(Nitrogen oxide)

 10024-97-2 50 90 ---- ---- ---- ---- ----
Nonane 111-84-2 200 1,050 ---- ---- ---- ---- ----
Octachloronaphthalene 2234-13-1 ---- 0.1 ---- 0.3 ---- ---- X
Octane 111-65-9 300 1,450 375 1,800 ---- ---- ----
Oil mist, mineral (particulate) 8012-95-1 ---- 5.0 ---- ---- ---- ---- ----
Osmium tetroxide (as Os) 20816-12-0 0.0002 0.002 0.0006 0.006 ---- ---- ----
Oxalic acid 144-62-7 ---- 1.0 ---- 2.0 ---- ---- ----
Oxygen difluoride 7783-41-7 ---- ---- ---- ---- 0.05 0.1 ----
Ozone 10028-15-6 0.1 0.2 0.3 0.6 ---- ---- ----
Paraffin wax fume 8002-74-2 ---- 2.0 ---- ---- ---- ---- ----
Paraquat (Respirable dust) 4685-14-7 ---- 0.1k ---- ---- ---- ---- X
1910-42-5
2074-50-2
Parathion 56-38-2 ---- 0.1 ---- ---- ---- ---- X
Particulate polycyclic

aromatic hydrocarbons

(see coal tar pitch volatiles)

 ---- ---- ---- ---- ---- ---- ---- ----
Particulates not otherwise

regulated (see WAC

296-62-07510)

 ((---- ---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Pentaborane 19624-22-7 0.005 0.01 0.015 0.03 ---- ---- ----
Pentachloronaphthalene 1321-64-8 ---- 0.5 ---- ---- ---- ---- X
Pentachlorophenol 87-86-5 ---- 0.5 ---- ---- ---- ---- X
Pentaerythritol 115-77-5 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Pentane 109-66-0 600 1,800 750 2,250 ---- ---- ----
2-Pentanone

(methyl propyl ketone)

 107-87-9 200 700 250 875 ---- ---- ----
Perchloroethylene

(tetrachloroethylene)

 127-18-4 25 170 ---- ---- ---- ---- ----
Perchloromethyl mercaptan 594-42-3 0.1 0.8 ---- ---- ---- ---- ----
Perchloryl fluoride 7616-94-6 3.0 14 6.0 28 ---- ---- ----
Perlite ((---- ---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Petroleum distillates

(Naptha) (Rubber Solvent)

 ---- 100 400 ---- ---- ---- ---- ----
Phenol 108-95-2 5.0 19 ---- ---- ---- ---- X
Phenothiazine 92-84-2 ---- 5.0 ---- ---- ---- ---- X
p-Phenylene diamine 106-50-3 ---- 0.1 ---- ---- ---- ---- X
Phenyl ether (vapor) 101-84-8 1.0 7.0 ---- ---- ---- ---- ----
Phenyl ether-diphenyl

mixture (vapor)

 ---- 1.0 7.0 ---- ---- ---- ---- ----
Phenylethylene((,)) (see Styrene) ---- ---- ---- ---- ---- ---- ---- ----
Phenyl glycidyl ether (PGE) 122-60-1 1.0 6.0 ---- ---- ---- ---- ----
Phenylhydrazine 100-63-0 5.0 20 10 45 ---- ---- X
Phenyl mercaptan 108-98-5 0.5 2.0 ---- ---- ---- ---- ----
Phenylphosphine 638-21-1 ---- ---- ---- ---- 0.05 0.25 ----
Phorate 298-02-2 ---- 0.05 ---- 0.2 ---- ---- X
Phosdrin (Mevinphos) 7786-34-7 0.01 0.1 0.03 0.3 ---- ---- X
Phosgene (carbonyl chloride) 75-44-5 0.1 0.4 ---- ---- ---- ---- ----
Phosphine 7803-51-2 0.3 0.4 1.0 1.0 ---- ---- ----
Phosphoric acid 7664-38-2 ---- 1.0 ---- 3.0 ---- ---- ----
Phosphorus (yellow) 7723-14-0 ---- 0.1 ---- ---- ---- ---- ----
Phosphorous oxychloride 10025-87-3 0.1 0.6 ---- ---- ---- ---- ----
Phosphorus pentachloride 10026-13-8 0.1 1.0 ---- ---- ---- ---- ----
Phosphorus pentasulfide 1314-80-3 ---- 1.0 ---- 3.0 ---- ---- ----
Phosphorus trichloride 7719-12-2 0.2 1.5 0.5 3.0 ---- ---- ----
Phthalic anhydride 85-44-9 1.0 6.0 ---- ---- ---- ---- ----
m-Phthalodinitrile 626-17-5 ---- 5.0 ---- ---- ---- ---- ----
Picloram 1918-02-1 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Picric acid 88-89-1 ---- 0.1 ---- ---- ---- ---- X
Pindone (((see Pival)))

(2-Pivalyl-1, 3-indandione)

 83-26-1 ---- 0.1 ---- ---- ---- ---- ----
Piperazine dihydrochloride 142-64-3 ---- 5.0 ---- ---- ---- ---- ----
Pival (see Pindone) ---- ---- ---- ---- ---- ---- ---- ----
Plaster of Paris 26499-65-0 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Platinum (as Pt) 7440-06-4 ((---- ---- ---- ---- ---- ---- ----))
Metal ---- ---- 1.0 ---- ---- ---- ---- ----
Soluble salts ---- ---- 0.002 ---- ---- ---- ---- ----
Polychlorobiphenyls

(see Chlorodiphenyls)

 ---- ---- ---- ---- ---- ---- ---- ----
Portland cement 65997-15-1 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Potassium hydroxide 1310-58-3 ---- ---- ---- ---- ---- 2.0 ----
Propane 74-98-6 1,000 1,800 ---- ---- ---- ---- ----
Propargyl alcohol 107-19-7 1.0 2.0 ---- ---- ---- ---- X
beta-Propiolactone

(see WAC 296-62-073)

 57-57-8 ---- ---- ---- ---- ---- ---- ----
Propionic acid 79-09-4 10 30 ---- ---- ---- ---- ----
Propoxur (Baygon) 114-26-1 ---- 0.5 ---- ---- ---- ---- ----
n-Propyl acetate 109-60-4 200 840 250 1,050 ---- ---- ----
n-Propyl alcohol 71-23-8 200 500 250 625 ---- ---- X
n-Propyl nitrate 627-13-4 25 105 40 170 ---- ---- ----
Propylene ---- Simple Asphyxiant ---- ---- ---- ---- ----
Propylene dichloride

(1, 2-Dichloropropane)

 78-87-5 75 350 110 510 ---- ---- ----
Propylene glycol dinitrate 6423-43-4 0.05 0.3 ---- ---- ---- ---- X
Propylene glycol

monomethyl ether

 107-98-2 100 360 150 540 ---- ---- ----
Propylene imine 75-55-8 2.0 5.0 ---- ---- ---- ---- X
Propylene oxide 75-56-9 20 50 ---- ---- ---- ---- ----
Propyne((,)) (see Methyl acetylene) ---- ---- ---- ---- ---- ---- ---- ----
Pyrethrum 8003-34-7 ---- 5.0 ---- ---- ---- ---- ----
Pyridine 110-86-1 5.0 15 ---- ---- ---- ---- ----
Quinone 106-51-4 0.1 0.4 ---- ---- ---- ---- ----
RDX (see Cyclonite) ---- ---- 1.5 ---- ---- ---- ---- X
Resorcinol 108-46-3 10 45 20 90 ---- ---- ----
Rhodium (as Rh) 7440-16-6
Insoluble compounds,

Metal fumes and dusts

 ---- ---- ---- 0.1 ---- ---- ---- ----
Soluble compounds, salts ---- ---- 0.001 ---- ---- ---- ---- ----
Ronnel 299-84-3 ---- 10 ---- ---- ---- ---- ----
Rosin core solder, pyrolysis

products (as formaldehyde)

 ---- ---- 0.1 ---- ---- ---- ---- ----
Rotenone 83-79-4 ---- 5.0 ---- ---- ---- ---- ----
Rouge
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Rubber solvent (naphtha) 8002-05-9 100 400 ---- ---- ---- ---- ----
Selenium compounds (as Se) 7782-49-2 ---- 0.2 ---- ---- ---- ---- ----
Selenium hexafluoride (as Se) 7783-79-1 0.05 0.2 ---- ---- ---- ---- ----
Sesone (see Crag herbicide) ---- ---- ---- ---- ---- ---- ---- ----
Silane (see Silicon tetrahydride) ---- ---- ---- ---- ---- ---- ---- ----
Silica, amorphous, precipitated

and gel

 112926-00-8 ---- 6.0 ---- ---- ---- ---- ----
Silica, amorphous, diatomaceous

earth, containing less than 1% crystalline silica

 61790-53-2 ((---- 6.0 ---- ---- ---- ---- ----))
Total dust ---- ---- 6.0 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 3.0k ---- ---- ---- ---- ----
Silica, crystalline

cristobalite, respirable dust

 14464-46-1 ---- 0.05k ---- ---- ---- ---- ----
Silica, crystalline

quartz, respirable dust

 14808-60-7 ---- 0.1 ((g/ h/)) k ---- ---- ---- ---- ----
Silica, crystalline

tripoli (as quartz),

respirable dust

 1317-95-9 ---- 0.1k ---- ---- ---- ---- ----
Silica, crystalline

tridymite,

respirable dust

 15468-32-3 ---- 0.05k ---- ---- ---- ---- ----
Silica, fused, respirable dust 60676-86-0 ---- 0.1k ---- ---- ---- ---- ----
Silicates (less than 1% crystalline silica((:)) )
Mica (Respirable dust) 12001-26-2 ---- 3.0k ---- ---- ---- ---- ----
Soapstone, Total dust ---- ---- 6.0 ---- ---- ---- ---- ----
Soapstone, Respirable dust ---- ---- 3.0k ---- ---- ---- ---- ----
Talc (containing asbestos):

use asbestos limit (see

WAC ((296-62-07517))

296-62-07705)

 ---- ---- ---- ---- ---- ---- ---- ----
Talc (containing no

asbestos), Respirable dust

 14807-96-6 ---- 2.0k ---- ---- ---- ---- ----
Tremolite

(see WAC ((296-62-07517))

296-62-07705)

 ---- ---- ---- ---- ---- ---- ---- ----
Silicon 7440-21-3
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Silicon Carbide 409-21-2
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Silicon tetrahydride 7803-62-5 5.0 7.0 ---- ---- ---- ---- ----
Silver, metal dust and soluble

compounds (as Ag)

 7440-22-4 ---- 0.01 ---- ---- ---- ---- ----
Soapstone (see Silicates) ---- ---- ---- ---- ---- ---- ---- ----
Sodium azide 26628-22-8 ((---- ---- ---- ---- ---- ---- ----))
(as HN3) ---- ---- ---- ---- ---- 0.1 0.3 X
(as NaN3) ---- ---- ---- ---- ---- 0.1 0.3 X
Sodium bisulfite 7631-90-5 ---- 5.0 ---- ---- ---- ---- ----
Sodium-2,

4-dichlorophenoxyethyl

sulfate (see Crag herbicide)

 ---- ---- ---- ---- ---- ---- ---- ----
Sodium fluoroacetate 62-74-8 ---- 0.05 ---- 0.15 ---- ---- X
Sodium hydroxide 1310-73-2 ---- ---- ---- ---- ---- 2.0 ----
Sodium metabisulfite 7681-57-4 ---- 5.0 ---- ---- ---- ---- ----
Starch 9005-25-8 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Stibine 7803-52-3 0.1 0.5 ---- ---- ---- ---- ----
Stoddard solvent 8052-41-3 100 525 ---- ---- ---- ---- ----
Strychnine 57-24-9 ---- 0.15 ---- ---- ---- ---- ----
Styrene 100-42-5 50 215 100 425 ---- ---- ----
Subtilisins 9014-01-1 ---- ---- ---- 0.00006 ---- ---- ----
(60min.)

((j/)) i

 ((----))
Sucrose 57-50-1 ((---- ---- ---- ----- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Sulfotep (see TEDP) ---- ---- ---- ---- ---- ---- ---- X
Sulfur dioxide 7446-09-5 2.0 5.0 5.0 13 ---- ---- ----
Sulfur hexafluoride 2551-62-4 1,000 6,000 ---- ---- ---- ---- ----
Sulfuric acid 7664-93-9 ---- 1.0 ---- ---- ---- ---- ----
Sulfur monochloride 10025-67-9 ---- ---- ---- ---- 1.0 6.0 ----
Sulfur pentafluoride 5714-22-1 ---- ---- ---- ---- 0.01 0.1 ----
Sulfur tetrafluoride 7783-60-0 ---- ---- ---- ---- 0.1 0.4 ----
Sulfuryl fluoride 2699-79-8 5.0 20 10 40 ---- ---- ----
Sulprofos 35400-43-2 ---- 1.0 ---- ---- ---- ---- ----
Systox (see Demeton) ---- ---- ---- ---- ---- ---- ---- ----
2, 4, 5-T 93-76-5 ---- 10 ---- ---- ---- ---- ----
Talc (see Silicates) ---- ---- ---- ---- ---- ---- ---- ----
Tantalum

Metal and oxide dusts

 7440-25-7 ---- 5.0 ---- ---- ---- ---- ----
TEDP (Sulfotep) 3689-24-5 ---- 0.2 ---- ---- ---- ---- X
Tellurium and compounds (as Te) 13494-80-9 ---- 0.1 ---- ---- ---- ---- ----
Tellurium hexafluoride (as Te) 7783-80-4 0.02 0.2 ---- ---- ---- ---- ----
Temephos 3383-96-8 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
TEPP 107-49-3 0.004 0.05 ---- ---- ---- ---- X
Terphenyls 26140-60-3 ---- ---- ---- ---- 0.5 5.0 ----
1, 1, 1, 2-Tetrachloro-2,

2-difluoroethane

 76-11-0 500 4,170 ---- ---- ---- ---- ----
1, 1, 2, 2-Tetrachloro-1,

2-difluoroethane

 76-12-0 500 4,170 ---- ---- ---- ---- ----
1, 1, 2, 2-Tetrachloroethane 79-34-5 1.0 7.0 ---- ---- ---- ---- X
Tetrachloroethylene

(see Perchloroethylene)

 ---- ---- ---- ---- ---- ---- ---- ----
Tetrachloromethane

(see Carbon tetrachloride)

 ---- ---- ---- ---- ---- ---- ---- ----
Tetrachloronaphhalene 1335-88-2 ---- 2.0 ---- ---- ---- ---- X
Tetraethyl lead (as Pb) 78-00-2 ---- 0.075 ---- ---- ---- ---- X
Tetrahydrofuan 109-99-9 200 590 250 735 ---- ---- ----
Tetramethyl lead (as Pb) 75-74-1 ---- 0.075 ---- ---- ---- ---- X
Tetramethyl succinonitrile 3333-52-6 0.5 3.0 ---- ---- ---- ---- X
Tetranitromethane 509-14-8 1.0 8.0 ---- ---- ---- ---- ----
Tetrasodium pyrophosphate 7722-88-5 ---- 5.0 ---- ---- ---- ---- ----
Tetryl (2, 4, 6-trinitrophenyl-

methylnitramine)

 479-45-8 ---- 1.5 ---- ---- ---- ---- X
Thallium (soluble compounds)

(as Tl)

 7440-28-0 ---- 0.1 ---- ---- ---- ---- X
4, 4-Thiobis

(6-tert-butyl-m-cresol)

 96-69-5 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Thioglycolic acid 68-11-1 1.0 4.0 ---- ---- ---- ---- X
Thionyl chloride 7719-09-7 ---- ---- ---- ---- 1.0 5.0 ----
Thiram

(see WAC 296-62-07519)

 137-26-8 ---- 5.0 ---- ---- ---- ---- ----
Tin (as Sn)

Inorganic compounds (except oxides)

 7440-31-5 ---- 2.0 ---- ---- ---- ---- ----
Tin, Organic compounds (as Sn) 7440-31-5 ---- 0.1 ---- ---- ---- ---- X
Tin Oxide (as Sn) 21651-19-4 ---- 2.0 ---- ---- ---- ---- ----
Titanium dioxide 13463-67-7 ((---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Toulene 108-88-3 100 375 150 560 ---- ---- ----
Toluene-2, 4-diisocyanate (TDI) 584-84-9 0.005 0.04 0.02 0.15 ---- ---- ----
m-Toluidine 108-44-1 2.0 9.0 ---- ---- ---- ---- X
o-Toluidine 95-53-4 2.0 9.0 ---- ---- ---- ---- X
p-Toluidine 106-49-0 2.0 9.0 ---- ---- ---- ---- X
Toxaphene

(see Chlorinated camphene)

 ---- ---- ---- ---- ---- ---- ---- ----
Tremolite (see Silicates) ---- ---- ---- ---- ---- ---- ---- ----
Tributyl phosphate 126-73-8 0.2 2.5 ---- ---- ---- ---- ----
Trichloroacetic acid 76-03-9 1.0 7.0 ---- ---- ---- ---- ----
1, 2, 4-Trichlorobenzene 120-82-1 ---- ---- ---- ---- 5.0 40 ----
1, 1, 1-Trichloroethane

(see Methyl chloroform)

 ---- ---- ---- ---- ---- ---- ---- ----
1, 1, 2-Trichloroethane 79-00-5 10 45 ---- ---- ---- ---- ----
Trichloroethylene 79-01-6 50 270 200 1,080 ---- ---- ----
Trichlorofluoromethane 75-69-4 ---- ---- ---- ---- 1,000 5,600 ----
Trichloromethane

(see Chloroform)

 ---- ---- ---- ---- ---- ---- ---- ----
Trichloronaphthalene 1321-65-9 ---- 5.0 ---- ---- ---- ---- X
1, 2, 3-Trichloropropane 96-18-4 10 60 ---- ---- ---- ---- X
1, 1, 2-Trichloro-1, 2,

2-trifluoroethane

 76-13-1 1,000 7,600 1,250 9,500 ---- ---- ----
Tricyclohexyltin hydroxide

(see Cyhexatin)

 ---- ---- ---- ---- ---- ---- ---- ----
Triethylamine 121-44-8 10 40 15 60 ---- ---- ----
Trifluorobromomethane 75-63-8 1,000 6,100 ---- ---- ---- ---- ----
Trimellitic anhydride 552-30-7 0.005 0.04 ---- ---- ---- ---- ----
Trimethylamine 75-50-3 10 24 15 36 ---- ---- ----
Trimethyl benzene 25551-13-7 25 125 ---- ---- ---- ---- ----
Trimethyl phosphite 121-45-9 2.0 10 ---- ---- ---- ---- ----
2, 4, 6-Trinitrophenol

(see Picric acid)

 ---- ---- ---- ---- ---- ---- ---- ----
2, 4, 6-Trinitrophenyl-

methylnitramine

(see Tetryl)

 ---- ---- ---- ---- ---- ---- ---- ----
2, 4, 6-Trinitrotoluene (TNT) 118-96-7 ---- 0.5 ---- ---- ---- ---- X
Triorthocresyl phosphate 78-30-8 ---- 0.1 ---- ---- ---- ---- X
Triphenyl amine 603-34-9 ---- 5.0 ---- ---- ---- ---- ----
Triphenyl phosphate 115-86-6 ---- 3.0 ---- ---- ---- ---- ----
Tungsten (as W) 7440-33-7 ((---- ---- ---- ---- ---- ---- ----))
Soluble compounds ---- ---- 1.0 ---- 3.0 ---- ---- ----
Insoluble compounds ---- ---- 5.0 ---- 10 ---- ---- ----
Turpentine 8006-64-2 100 560 ---- ---- ---- ---- ----
Uranium (as U) 7440-61-1 ((---- ---- ---- ---- ---- ---- ----))
Soluble compounds ---- ---- 0.05 ---- ---- ---- ---- ----
Insoluble compounds ---- ---- 0.2 ---- 0.6 ---- ---- ----
n-Valeraldehyde 110-62-3 50 175 ---- ---- ---- ---- ----
Vanadium (as V2O5) 1314-62-1 ---- 0.05 ---- ---- ---- ---- ----
Respirable dust and fume
Vegetable oil mist ((---- ---- ---- ---- ---- ---- ---- ----))
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Vinyl acetate 108-05-1 10 30 20 60 ---- ---- ----
Vinyl benzene (see Styrene) ---- ---- ---- ---- ---- ---- ---- ----
Vinyl bromide 593-60-2 5.0 20 ---- ---- ---- ---- ----
Vinyl chloride

(see WAC 296-62-07329)

 75-01-4 ---- ---- ---- ---- ---- ---- ----
Vinyl cyanide

(see Acrylonitrile)

 ---- ---- ---- ---- ---- ---- ---- ----
Vinyl cyclohexene dioxide 106-87-6 10 60 ---- ---- ---- ---- X
Vinyl toluene 25013-15-4 50 240 ---- ---- ---- ---- ----
Vinylidene chloride

(1, 1-Dichloroethylene)

 75-35-4 1.0 4.0 ---- ---- ---- ---- ----
VM & P Naphtha 8032-32-4 300 1,350 400 1,800 ---- ---- ----
Warfarin 81-81-2 ---- 0.1 ---- ---- ---- ---- ----
Welding fumes ((f/)) f

(total particulate)

 ---- ---- 5.0 ---- ---- ---- ---- ----
Wood dust((: ---- ---- ---- ---- ---- ---- ---- ----))
Nonallergenic;

All soft woods and hard

woods except allergenics

 ---- ---- 5.0 ---- 10 ---- ---- ----
Allergenics; (e.g. cedar,

mahogany and teak)

 ---- ---- 2.5 ---- ---- ---- ---- ----
Xylenes (Xylol)

(o-, m-, p-isomers)

 1330-20-7 100 435 150 655 ---- ---- ----
m-Xylene alpha, alpha-diamine 1477-55-0 ---- ---- ---- ---- ---- 0.1 X
Xylidine 1300-73-8 2.0 10 ---- ---- ---- ---- X
Yttrium 7440-65-5 ---- 1.0 ---- ---- ---- ---- ----
Zinc chloride fume 7646-85-7 ---- 1.0 ---- 2.0 ---- ---- ----
Zinc chromate (as Cr03) Varies ((w/)) with Compound ---- 0.05 ---- ---- ---- 0.1 ----
Zinc oxide 1314-13-2
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Zinc oxide fume 1314-13-2 ---- 5.0 ---- 10 ---- ---- ----
Zinc stearate 557-05-1
Total dust ---- ---- 10 ---- ---- ---- ---- ----
Respirable fraction ---- ---- 5.0k ---- ---- ---- ---- ----
Zirconium compounds (as Zr) 7440-67-2 ---- 5.0 ---- 10 ---- ---- ----

Notes: a((/)) Parts of vapor or gas per million parts of contaminated air by volume at 25((')) degrees C and 760 mm((.)) Hg((.)) pressure (torr((.))).

b((/)) Milligrams of substance per cubic meter of air. When a numerical entry for a substance is in the mg/m3 column and not in the ppm column, then the number in the mg/m3 column is exact. When numerical entries for a substance are in both the ppm and mg/m3 columns, then the number in the ppm column is exact and the number in the mg/m3 column may be rounded off.

c((/)) Duration is for 15 minutes, unless otherwise noted.

d((/)) The final benzene standard in WAC 296-62-07523 applies to all occupational exposures to benzene except some sub-segments of industry where exposures are consistently under the action level (i.e., distribution and sale of fuels, sealed containers and pipelines, coke production, oil and gas drilling and production, natural gas processing, and the percentage exclusion for liquid mixtures).

e((/)) This 8-hour TWA applies to respirable dust as measured by a vertical elutriator cotton dust sampler or equivalent instrument. The time-weighted average applies to the cotton waste processing operations of waste recycling (sorting, blending, cleaning, and willowing) and garretting. See also WAC 296-62-14533 for cotton dust limits applicable to other sectors.

f((/)) As determined from breathing-zone air samples.

g((/ Total dust formula for Silica (as quartz) is:



30mg/m3

% SiO2 + 3

h/)) Both concentration and percent quartz for the application of this limit are to be determined from the fraction passing a size-selector with the following characterstics:
Aerodynamic diameter

(unit_density_sphere)

 Percent_passing_selector
((2 90
2.5 75
3.5 50
5.0 25
10 0))
1 97
2 91
3 74
4 50
5 30
6 17
7 9
8 5
10 1


((Notes: i/)) h The CAS number is for information only. Enforcement is based on the substance name. For an entry covering more than one metal compound measured as the metal, the CAS number for the metal is given -- not CAS numbers for the individual compounds.

((j/)) i Compliance with the subtilisins PEL is assessed by sampling with a high volume sampler (600-800 liters per minute) for at least 60 minutes.

((m/)) j Sampling for the carbon monoxide ceiling shall be averaged over 5 minutes but an instantaneous reading over 1500 ppm shall not be exceeded.

k The concentration of respirable particulate for the application of this limit is determined from the fraction passing a size-selector with the following characteristics.

Aerodynamic diameter

(unit density sphere)



Percent passing selector
1 97
2 91
3 74
4 50
5 30
6 17
7 9
8 5
10 1




[Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. 97-19-014, § 296-62-07515, filed 9/5/97, effective 11/5/97. Statutory Authority: Chapter 49.17 RCW. 96-17-056, § 296-62-07515, filed 8/20/96, effective 10/15/96; 93-01-067 (Order 92-15), § 296-62-07515, filed 12/11/92, effective 1/15/93; 91-11-070 (Order 91-01), § 296-62-07515, filed 5/20/91, effective 6/20/91; 90-03-029 (Order 89-20), § 296-62-07515, filed 1/11/90, effective 2/26/90; 89-15-002 (Order 89-06), § 296-62-07515, filed 7/6/89, effective 8/7/89; 88-14-108 (Order 88-11), § 296-62-07515, filed 7/6/88; 87-24-051 (Order 87-24), § 296-62-07515, filed 11/30/87. Statutory Authority: RCW 49.17.040 and 49.17.050. 86-16-009 (Order 86-28), § 296-62-07515, filed 7/25/86; 85-01-022 (Order 84-24), § 296-62-07515, filed 12/11/84; 82-13-045 (Order 82-22), § 296-62-07515, filed 6/11/82. Statutory Authority: RCW 49.17.040, 49.17.050 and 49.17.240. 81-16-015 (Order 81-20), § 296-62-07515, filed 7/27/81; 80-11-010 (Order 80-14), § 296-62-07515, filed 8/8/80. Statutory Authority: RCW 49.17.040, 49.17.150 and 49.17.240. 79-08-115 (Order 79-9), § 296-62-07515, filed 7/31/79; Order 73-3, § 296-62-07515, filed 5/7/73.]
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