Abstract

A 1.1 oz/yd2 parachute fabric has been developed based on a new 55 denier Kevlar** aramid fiber. This fabric, Style 172, has 3X the strength of nylon at the same weight and thickness and is nonmelting. Fabric construction is a 72x72, 2x2 twill weave and air permeability is adjustable from 50 to 150 CFM/FT depending on end-use. Yarn twist, fabric construction, and finishing are all critical in meeting weight, thickness, and air permeability requirements. The primary application under development is nonmelting cockpit ejection chutes for the Navy and Air Force to reduce death and injuries from fireball situations. Laboratory flammability testy show that 5-172 fabric exposed to the 2 cal/cm sec heat flux generated in a jet fuel fireball retains sufficient strength after at least

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