Accession Number : AD0697029

Title :   EXPOSURE OF ELASTOMERS TO HYDRAZINE AND AIR, WATER VAPOR, OR CARBON DIOXIDE,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF SYSTEMS ENGINEERING OPERATIONS

Personal Author(s) : Takimoto,Hideyo H. ; Denault,Genevieve C. ; Marsh,Peter A.

Report Date : 01 JUL 1969

Pagination or Media Count : 10

Abstract : Specimens of Stillman Rubber (SR) 721-P80 and SR 724-90 (forms of ethylene-propylene rubber) potential elastomers for valve seat applications in hydrazine monopropellant systems, were alternately exposed to hydrazine and either air, water vapor, or carbon dioxide. The weight changes of the elastomers were determined during these cyclic exposures, and periodic checks of the thickness changes were made. The weight change for SR 724 leveled off at 2 to 3 percent, while that of SR 721 continued to increase with the number of cycles (for hydrazine and vapor, 26 percent after 40 cycles). SR 724 is superior to SR 721 in terms of its swelling characteristic with hydrazine where periodic exposures to air are encountered. (Author)

Descriptors :   (*ELASTOMERS, ENVIRONMENTAL TESTS), (*HYDRAZINE, ELASTOMERS), (*LIQUID ROCKET PROPELLANTS, *PLASTIC SEALS), TEST METHODS, CARBON DIOXIDE, AIR, WATER VAPOR, VALVES

Subject Categories : Elastomers and Rubber
      Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE