Abstract
Fibers formed from poly(1,3,4)-benzimidazole (PBI) have been spun, using the cotton system, into yarns and woven into a series of plain- and twill-weave fabrics. The high moisture regain (10-13%), good abrasion resistance, and high degree of heat-blocking, in addition to nonflammability in air, has resulted in PBI being considered for Air Force personnel protection systems. Laboratory and field evaluation of PBI fabrics in protection system configurations compared to currently used fabrics demonstrated the superior nonflammability of PBI. Based on data obtained, extensive wear testing of flight coveralls is to be initiated.
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