Abstract
Abstract NASA-LeRC in-house and contractual experimental programs were conducted to determine the cryogenic flexibility of single and multiple plies of thin polymeric films at −320 and −423°F (77 and 20°K). Results of cryogenic flexibility or “twist-flex” testing showed that thin Mylar films are the most flexible of the films tested. The relation between cryogenic cycle life, film thickness, and the number of plies for Mylar film are reported at −320 and −423°F (77 and 20°K). Results of contractual testing of Mylar, Kapton, and polyethylene film bladders at −423°F (20°K) are summarized. Bladder material combinations showing the lowest helium gas porosity after 25 liquid hydrogen cycles are Mylar and an organic filament-reinforced polyethylene film laminate and Kapton/Nomex-Nylon.
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