Nomex fiber

International Union of Biochemistry and Microbiology, 17 402 Nomenclature of Inorganic Chemistry (IUPAC), 17 392-393, 399 Nomex, 10 211, 212 Nomex aramid, 13 372 Nomex fiber, 13 373 Nominal mass, 15 649, 650 Nonaaquaneodymium(III), 7 578t Nonaborane(15), 4 186... 

Nomex fiber has excellent fire resistance and is frequently used in applications requiring resistance to fire Nomex and Kevlar fibers, individually or in a blend, are used to make fire protection garments. They are also used extensively in electrical insulation, thermal liners and moisture barriers. 

Figure 9-30. SEM pictures of Nomex fibers after exposition in diluted H2SO4.

Property Nylon-6,6 IxeffHigh-lmpact Grade) Trogamid T Nomex (Fiber) Kevlar... 

Bags of Nomex fiber can withstand a continuous operating temperature of 400° F (204°C). Additionally the fiber remains dimensionally stable at this temperature—neither growing nor shrinking more than 1%. The common felt in the industry is a 14 oz/yd felt made of 2 dpf fibers. 

Aromatic polyamides were introduced early on because of their superior heat resistance. The early versions of these polymers were produced from isophthaloyl chloride and m-phenylenediamine. These are known as Nomex fibers. The general structure is as follows ... 

Fiber Structure. An extensive description of the structure of PPTA (Kevlar) fibers has been provided in a 1993 book (47), including a description of the crystal lattice (48), estimates of apparent crystallite size and percent ciys-tallinity, a description of fibrillar and pleat structure, and evidence of a skin-core structure. Crystal lattice structure and dimensions for PBA and MPDI (Nomex) fibers are also included, as shown in Table 3. The structure of Twaron is essentially the same (10), while the crystal structure ofTeijinconex is nearly identical to the MPDI fiber in Table 3. PPTA fibers are highly crystalline, ranging from 68 to 95% crystalline depending on the heat treatment of the fiber and the crystallinity measurement technique. MPDI fibers are also highly crystalline, although the crystal lattice is quite different from that of PPTA (30). 

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