Nutria fibre (hair)

Fibre from the coypu (Myocastor coypus)

Nylon (fibre) (generic name)

A manufactured fibre composed of synthetic linear macromolecules having in the chain recurring amide groups, at least 85% of which are attached to aliphatic or cyclo-aliphatic groups. (See also Classification Table, p.401.)
Note 1: This limited definition was introduced by ISO in 1977 as a consequence of the creation of a separate class for aramid fibres.
Note 2: The tenn polyamide is not used generically in the U.S.A.

Nylon Fiber

A manufactured fiber in which the fiber forming substance is any long chain synthetic polyamide having recurring amide groups (-NH-CO-) as an integral part of the polymer chain (FTC definition). The two principal nylons are nylon 66 which is polyhexamethylenedianime adipamide and nylon 6 which is polycaprolactam. Nylon 66 is so designated because each of the raw materials hexamethylenediamine and adipic acid contains six carbon atoms. In the manufacture of nylon 66 fiber these materials are combined and the resultant monomer is then polymerized. After polymerization the material is hardened into a translucent ivory-white solid that is cut or broken into fine chips flakes or pellets. This material is melted and extruded through a spinneret while in the molten state to form filaments that solidify quickly as they reach the cooler air. The © 2001 Celanese Acetate LLC filaments are then drawn or stretched to orient the long molecules from a random arrangement to an orderly one in the direction of the fiber axis. This drawing process gives elasticity and strength to the filaments. Nylon 6 was developed in Germany where the raw material caprolactam had been known for some time. It was not until nylon 66 was developed in the United States that work was initiated to convert caprolactam into a fiber. The process for nylon 6 is simpler in some respects than that for nylon 66. Although nylon 6 has a much lower melting point than nylon 66 (a disadvantage for a few applications) it has superior resistance to light degradation and better dyeability elastic recovery fatigue resistance and thermal stability. Two other nylons are (1) nylon 11 a polyamide made from 11-amino-undecanoic acid; and (2) nylon 610 made from the condensation product of hexamethylenediamine and sebacic acid. Nylon 610 has a lower melting point than nylon 66 and the materials for its manufacture are not as readily available as those for nylon 66. Experimental work has been conducted on other nylons.

Nytril (fibre) (generic name U.S.A.)

A manufactured fibre containing at least 85% of a long-chain polymer of 1,1-dicyatioetlielle (vinylidene dinitrile) where the vinylidene dinitrile content is no less than every other unit in the polymer chain. (See also Classification Table, p.401.)

Nytril Fiber

A manufactured fiber containing at least 85% by weight of a long chain polymer of vinylidene dinitrile [-CH2-C(CN)2-] and having the vinylidene dinitrile group in no less than every other unit in the polymer chain (FTC definition). Nytril fibers have a low softening point so they are most commonly used in articles that do not require pressing such as sweaters and pile fabrics. They are also blended with wool to improve shrink resistance and shape retention. © 2001 Celanese Acetate LLC O