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ABLATIVE PLASTIC CHARACTERIZATION IN SOLID PROPELLANT EXHAUST. PART 2
Summary rept. 1 Jul 1965-31 Jan 1967
ATLANTIC RESEARCH CORP ALEXANDRIA VA
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The purpose of this program was to characterize ablative plastics for service in the nozzle region of solid propellant motors. Evaluation of specimens provided by the Air Force Materials Laboratory was accomplished by exposure to a realistic chemical, mechanical, and thermal environment in a subscale, high- velocity motor test. This report describes the work of the final nineteen months of a thirty-two month program. The standard test method developed in the previous year AFML TR 65-315 was used for thirteen firing tests. Based on the first two of these firings, flat laminate specimens were chosen as standard because char rate data could be obtained and specimen fabrication was greatly simplified. In the final eleven firing tests, seventeen different resins or resin mixtures were compared with a standard commercial phenolic with either graphite or carbon cloth reinforcement. Two resins naphthalene diol and phenylphenol phenol formaldehyde gave significantly better results than the standard. Several other resins, including a chrome phenolic polyphenyl, polyimide, and 2-7 dihydro-xynaphthalene phenol formaldehyde, showed either similar performance or promise for improved performance.
APPROVED FOR PUBLIC RELEASE