ELASTOMER COMPATIBILITY WITH MIL-L-007808F(USAF) LUBRICATING OILS.
Technical rept. 1 Jun 65-8 Feb 67,
MONSANTO RESEARCH CORP DAYTON OH
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Program objectives were to develop compatibility data relating to test temperatures, procedures, elastomers, and test fluids to aid the Air Force in the selection of standard evaluation conditions. These standard conditions are to be used in MIL-L-7808 and various elastomer seal specifications. Thirteen elastomer formulations and five lubricants MIL-L-7808 were investigated. Immersion temperatures and times were varied according to elastomer composition Viton, Fluorosilicone, Buna N and the effect obtained. Change in hardness, elongation, tensile strength, and volume were determined. The maximum temperatures recommended for future tests are Viton, 347 F Fluorosilicone, 302 F and Buna N, 257 F. Specimens exposed for 72 and 168 hr generally gave results that were approximately of the same order of magnitude. Difficulty was encountered in obtaining valid hardness values for O-ring specimens thus indicating the desirability for an improved test procedure. Current specifications are ambiguous in their definition of test temperature measurement and these should be clarified in future test methods in specifications. Author
- Elastomers and Rubber