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1926.251(e) Synthetic Webbing (Nylon, Polyester, and Polypropylene)
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The employer shall have each synthetic web sling marked or coded to show:
Name or trademark of manufacturer.
Type of material
Rated capacities for the type of hitch.
Rated capacity shall not be exceeded.
Synthetic webbing shall be of uniform thickness and width and selvage edges shall not be split from the webbing's width.
Fittings shall be:
Of a minimum breaking strength equal to that of the sling; and
Free of all sharp edges that could in any way damage the webbing.
Stitching shall be the only method used to attach end fittings to webbing and to form eyes. The thread shall be in an even pattern and contain a sufficient number of stitches to develop the full breaking strength of the sling.
When synthetic web slings are used, the following precautions shall be taken:
Nylon web slings shall not be used where fumes, vapors, sprays, mists or liquids of acids or phenolics are present.
Web slings with aluminum fittings shall not be used where fumes, vapors, sprays, mists or liquids of caustics are present.
Polyester and polypropylene web slings shall not be used where fumes, vapors, sprays, mists or liquids of caustics are present.
Synthetic web slings of polyester and nylon shall not be used at temperatures in excess of 180 °F (82.2 °C). Polypropylene web slings shall not be used at temperatures in excess of 200 °F (93.33 °C).
Synthetic web slings shall be immediately removed from service if any of the following conditions are present:
Acid or caustic burns;
Snags, punctures, tears or cuts;
Broken or worn stitches; or
Melting or charring of any part of the sling surface;