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EFFECT OF LOW PRESSURE AT ELEVATED TEMPERATURES ON SPACE VEHICLE MATERIALS
MARTIN CO BALTIMORE MD
Pagination or Media Count:
Forty-one selected nonmetals were exposed to vacua of 0.001 to 10 to the -6th power mm Hg at elevated temperatures for periods of 1.5 to 6 hr. These materials included plastics, elastomers, greases, potting compounds, sealants, adhesives and electrical insulation. The pressures at which the materials were tested corresponded to simulated altitudes of 50 to 100 mi. Selected physical, chemical and electrical testing of the before and after variety was conducted. No in vacuo testing was performed. Test data obtained from the vacuum exposed samples was compared with similar data obtained on samples exposed to the same temperatures at atmospheric pressure. Some of the materials tested were significantly affected by the high vacuum exposure. Among these were the neoprene and Buna-N elastomers, phenolic 91LD-Fiberglas laminate, Epon potting compound, Sealants PR 1422 and EC 801, and Greases MIL-G10924, MIL-G-3278 and MIL-G-7118. Author
APPROVED FOR PUBLIC RELEASE