| Agent Name |
Aramid fibers |
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| CAS Number |
24938-64-5 |
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| Formula |
(C14-H10-N2-O2)mult- |
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| Major Category |
Plastics & Rubber |
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| Synonyms |
Aramica; Aramid fibers; Aramika; Kevlar 149; Kevlar 29; Kevlar 49; Poly(imino-p-phenyleneiminoterephthaloyl); Poly(p-phenylene terephthalamide); Kevlar 49; Poly(imino-1,4-phenyleneiminocarbonyl-1,4-phenylenecarbonyl); [ChemIDplus] |
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| Category |
Plastic & Rubber Dusts/Fumes |
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| Sources/Uses |
Chemical and fire resistant, high strength synthetic fiber used to make advanced composite materials; derived from p-phenylenediamine and terephthaloyl chloride; [Hawley] Used to reinforce composite materials for aerospace and sports equipment and to make woven protective apparel and automotive brake pads and gaskets; [IARC] Introduced by DuPont in the early 1970s under the trademark Kevlar, a condensation product of p-phenylenediamine and terephthalic acid; Other aramid fibers are Enka from the Netherlands and Teijin from Japan; Used in tires, ropes, cables, ballistic protection, coated fabrics, tapes, friction products, gaskets, and reinforced plastics; [Ullmann] |
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| Comments |
Highest occupational exposures produced during processing of shorter fibers in yarn; Rats exposed for 2 years to para-aramid fibrils have minimal pulmonary fibrosis; Studies in rats show that the fibrils are biodegradable in the lungs; Rats had increased incidence of pulmonary keratinizing cysts; "The biological significance ot these lesions is unclear." [IARC] |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
Not evaluated |
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| Adverse Effects |
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| IARC Carcinogen |
Not Classifiable |
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| Links to Other NLM Databases |
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