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Kevlar® is a  para-aramid fiber which displays excellent dimensional stability over a wide  range of temperatures for prolonged periods. Even at temperatures of 320°  F (160° C) Kevlar® shows essentially no embrittlement or strength loss.  Kevlar® fiber also has excellent dimensional stability with a slightly  negative coefficient of thermal expansion (-1.1 X 10-6/° F or -0.2 X 10-6/°  C). Kevlar ® fiber does not melt or support combustion but will start to  decompose at about 800° F (427° C).

Kevlar® 29 & 129 are tough yarns  which are better suited for ballistic protection and are used both in soft  body armor applications such as personal protection ballistic vests, and as  robust reinforcements for a variety of hard armor applications, racing  helmets, ballistic helmets, spall panels, ballistic blankets and electronic  housing protection.  This Style Kevlar has also been used in many  industrial type applications.    
Kevlar ® KM2, made in 400 denier, 600  denier and 850 denier, is a high performance product variant specially  designed for use in Military ballistic applications. These yarns are used in  both soft and hard military products to defeat multiple threats.
Kevlar® LT is a new yarn that’s used in  the development of the lightest weight body armor products on the market  today. This new yarn is mainly used in the civilian police products to  provide comfortable, high level protection.
Kevlar® K-159 was developed for correctional  institutions as the first stab resistant fabric. This new Kevlar® fiber, which is  4 times thinner than typical ballistic yarns, is used for an ultra-dense weave  but still maintains a strength value that is five times stronger than steel on  an equal weight basis.