3102-04 Stone wool insulation: Manufacturing
Applies to:
Businesses manufacturing mineral wool insulation from siliceous materials.
Materials used include, but are not limited to:
• Glass;
• Rock;
• Slag;
• Other siliceous materials.
Work activities include, but are not limited to:
• Blowing hot air or steam through molten rock or slag in a special furnace.
• Drawing molten glass at high speeds through orifices, then subjecting it to jets of high pressure steam which break the glass filaments into fine fibers to produce fiberglass insulation material.
• Shredding the material into a mass of fine intertwined fibers to form the wool.
• Forming and shipping the final product, such as granules which are bagged, or flat sheets which are cut to size, enclosed in paper or foil, and packaged.
• Incidental rock, slag, and glass crushing.
Exclusions:
• Digging or quarrying of raw materials is classified in the classification appropriate to the work being performed.
• Manufacturing asbestos products is classified in 3104.
[Statutory Authority: RCW
51.04.020 and
51.16.035. WSR 24-23-081, s 296-17A-3102, filed 11/19/24, effective 1/1/25; WSR 20-20-108, § 296-17A-3102, filed 10/6/20, effective 1/1/21. WSR 07-01-014, recodified as § 296-17A-3102, filed 12/8/06, effective 12/8/06. Statutory Authority: RCW
51.16.035. WSR 98-18-042, § 296-17-572, filed 8/28/98, effective 10/1/98; WSR 96-12-039, § 296-17-572, filed 5/31/96, effective 7/1/96. Statutory Authority: RCW
51.04.020(1) and
51.16.035. WSR 93-12-093, § 296-17-572, filed 5/31/93, effective 7/1/93. Statutory Authority: RCW
51.16.035. WSR 85-24-032 (Order 85-33), § 296-17-572, filed 11/27/85, effective 1/1/86; Order 73-22, § 296-17-572, filed 11/9/73, effective 1/1/74.]