(1) Sling identification. Each sling must be marked or coded to show the rated capacities for each type of hitch and type of synthetic web material.

(2) Webbing. Synthetic webbing must be of uniform thickness and width and selvage edges must not be split from the webbing's width.

(3) Fittings must be:

(a) Of a minimum breaking strength equal to that of the sling; and

(b) Free of all sharp edges that could in any way damage the webbing.

(4) Attachment of end fittings to webbing and formation of eyes. Stitching must be the only method used to attach end fittings to webbing and to form eyes. The thread must be in an even pattern and contain a sufficient number of stitches to develop the full breaking strength of the sling.

(5) Sling use. Synthetic web slings illustrated in Figure D-6 must not be used with loads in excess of the rated capacities specified in Tables D-20 through D-22. Slings not included in these tables must be used only in accordance with the manufacturer's recommendations.

(6) Environmental conditions. When synthetic web slings are used, the following precautions must be taken:

(a) Nylon web slings must not be used where fumes, vapors, sprays, mists or liquids of acids or phenolics are present.

(b) Polyester and polypropylene web slings must not be used where fumes, vapors, sprays, mists or liquids of caustics are present.

(c) Web slings with aluminum fittings must not be used where fumes, vapors, sprays, mists or liquids of caustics are present.

(7) Safe operating temperatures. Synthetic web slings of polyester and nylon must not be used at temperatures in excess of 180°F. Polypropylene web slings must not be used at temperatures in excess of 200°F.

(8) Repairs.

(a) Synthetic web slings which are repaired must not be used unless repaired by a sling manufacturer or an equivalent entity.

(b) Each repaired sling must be proof tested by the manufacturer or equivalent entity to twice the rated capacity prior to its return to service. You must retain a certificate of the proof test and make it available for examination.

(c) Slings, including webbing and fittings, which have been repaired in a temporary manner must not be used.

(9) Removal from service. Synthetic web slings must be immediately removed from service if any of the following conditions are present:

(a) Acid or caustic burns;

(b) Melting or charring of any part of the sling surface;

(c) Snags, punctures, tears or cuts;

(d) Broken or worn stitches; or

(e) Distortion of fittings.