Resistance of Various Samples of 'Fiberglas' to Perforation by Fragment-Simulating Projectiles
Partial rept. no. 2
WATERTOWN ARSENAL LABS MA
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As part of a program of development of improved body armor components, requested by the Office, Chief of Ordnance, and in response to a specific directive from this office, several types of Fiberglas, furnished by the Owens-Corning Fiberglas Corporation and varying in weave, weight and texture, have been tested ballistically at this arsenal. The resistance of these samples to perforation by cal. .45 steel-jacketed ball projectiles and by cal. .22 fragment-simulating projectiles seems to reflect the characteristics of the yarn and the closeness of their texture, since those showing greatest resistance were closely woven and made of fine-fibred, multi-stranded, high-twist yarn while the affording lowest resistance were less closely woven and made of yarn with coarser fibres and a lower number of strands, Theresistance of the best sample to perforation by cal. .45 ball projectiles compares favorably with that of an equivalent weight of 17 12 ounce nylon duck, which has exhibited the greatest resistance of any fabric tested here, but underthe impact of the cal. . 22 fragment-simulating projectile, G-2, it was considerably inferior. However, the resistance of Hadfield manganese steel of equal weight is much greater than either of these fabrics.