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Kevlar (para-aramid) [2] is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora.Developed by Stephanie Kwolek at DuPont in 1965, [3] [2] [4] the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.
Polybenzimidazole (PBI, short for poly[2,2’-(m-phenylen)-5,5’-bisbenzimidazole]) fiber is a synthetic fiber with a very high decomposition temperature. It does not exhibit a melting point , it has exceptional thermal and chemical stability, and it does not readily ignite. [ 1 ]
The starting point for this development were the ballistic-only offerings of that time using NIJ Level 2A, 2, and 3A or HOSDB HG 1 and 2, with compliant ballistic vest products being manufactured with areal densities of between 5.5 and 6 kg/m 2 (1.1 and 1.2 lb/ft 2 or 18 and 20 oz/ft 2). However police forces were evaluating their "street ...
Excellent thermal stability at temperature extremes, water repellency, chemical stability and resistance to petroleum products have made Kevlar KM2 an indispensable asset to the military personnel who use it every day." [1] "Kevlar KM2 fiber is a transversely isotropic material. Its tensile stress–strain response in the axial direction is ...
The VPAM scale as of 2009 runs from 1 to 14, with 1-5 being soft armor, and 6-14 being hard armor. [1] Tested armor must withstand three hits, spaced 120 mm (4.7 inches) apart, of the designated test threat with no more than 25 mm (0.98 inches) of back-face deformation in order to pass.
It was introduced in 1972, [3] accepted in 1974 by the Federal Trade Commission of the USA as the name of a generic category of fiber distinct from nylon, [4] [5] and adopted by the International Standards Organisation in 1977. [citation needed] Aromatic in the longer name refers to the presence of aromatic rings of six carbon atoms.
Liquid armour is a material under research by defense institutions and universities around the world including the United States Army Research Laboratory (ARL). [1] [2] [3] Some of the earliest research in this area was performed at Massachusetts Institute of Technology [4] and University of Delaware [5] in 2003.
[5] Most pilots and aircrew wear a flight helmet for protection from aviation-related hazards (such as an integrated oxygen mask), but typically offers little ballistic protection. The Pith helmet is worn not for ballistic protection, but to identify weapons range coaches and other range personnel. Marine wears a M50 mask Other armor
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