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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).