Aramid Fibers

Properties

Aramid fibers are a class of heat-resistant and extremely strong synthetic fibers. They are formed from completely aromatic polyamides. They are fibers in which the fiber-forming substance is a long-chain synthetic polyamide in which at least 85% of the amide linkages are attached directly to two aromatic rings.

Aramid fibers are produced by spinning a solid fiber from a liquid chemical blend. They are rather expensive and difficult to manufacture, but unlike high molecular weight HDPE, aramid is polar and has a much higher glass transition temperature and no melting point.

Aramid fibers have an outstanding strength-to-weight ratio, even better than carbon, excellent dimensional stability due to the high young's modulus (stiffness & low elongation at break), and outstanding abrasion resistance and tenacity (difficult to cut or fray).

Due to the aromatic structure, aramid fibers have very low flammability, excellent heat resistance and good chemical resistance to most organic solvents, but are sensitive to salt (chlorine), and to some acids and bases, and to degradation from ultraviolet radiation.

 

COMMERCIAL Aramid Fibers

Major manufacturers and suppliers of aramid fibers are DuPont, Toyobo, Aramid HPM and Teijin.

 

Applications

Aramid fibers are used for very demanding applications. They are used for ballistic-protective / stab resistant products, like bulletproof vests; heat resistant garments, like safety gloves, firerfighting uniforms; rubber and plastic reinforcements for hoses and belts; high performance sporting goods; optical fibers; heat-resistant filters; and various civil engineering materials.

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