BALLISTIC PROTECTIVE BUOYANY MATERIALS
Quarterly rept. no. 12, 1 Oct-31 Dec 1962
CARNEGIE-MELLON UNIV PITTSBURGH PA MELLON INST OF SCIENCE
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An increase of approximately 50 in the buoyancies of hydrophobed needled felts has been made possible by the use of the compartmentation technique. It was determined that the buoyancy of a submerged hydrophobed batting increased as its angle to the water surface approached zero. A comparison of carded battings prepared from crimped and straight hydrophobed fine fibers has shown that those containing the crimped staples have superior buoyant and ballistic properties. In the preparation of needled batts, an increase in the amount of needling is generally accompanied by a decrease in buoyant and ballistic effectiveness. Carded batts are definitely superior to needled batts in body armors. Although 1.0 dpf Acrilan and 1.25 dpf Dacron fibers have approximately equal diameters, the Acrilan staple is more effective as a buoyant and ballistic filler.