Yarn and Tape Tensile Properties in Vacuum.
Technical rept. May 68-Nov 69,
FABRIC RESEARCH LABS INC DEDHAM MA
Pagination or Media Count:
The tensile properties of nylon, Dacron, Nomex, PBI polybenzimidazole,X-101 aromatic polyamide, PRD-14 polyimide, and fiberglass yarn were determined in vacuum at 70 F after 7-10 day and 45 day vacuum exposures. The tensile strengths of 9 l6 inch wide nylon, Dacron and Nomex tape were also measured in vacuum after 7 day exposures. With several notable exceptions, long term exposures gen-erally do not have a large effect on the tensile proper-ties of polymeric yarns. The tensile modulus of nylon and X-101 yarn, the rupture elongation of Nomex yarn, and the modulus and rupture elongation of Dacron and PRD-14 yarn in vacuum differ by 10 to 25 from their properties in 14.7psia, 70 F, 65 RH in air. The othertensile properties of these yarns and the properties of PBI yarn in vacuum differ from the properties in air by less than 10 and in most instances by less than 5. The tensile strength of fiberglass yarn in vacuum is as much as 39 greater and the rupture elongation, 25 greater than in air. The rupture load of the 916 inch nylon, Dacron and Nomex tapes are 2 to 7 12 GREATER IN VACUUM THAN IN AIR. Author-PL