Efforts within the Materials Laboratory of the Air Force Wright Aeronautical Laboratories to develop seal materials for a nonflammable aircraft hydraulic fluid are discussed. Candidate materials are identified and the laboratory efforts to compound these materials for optimum performance are reported. Candidate seal performance is summarized from dynamic performance tests conducted at temperatures of 135° C and system pressures of 10.35 MPa in the laboratory’s “Chew Tester” and “Rod Seal Tester.” The drastic effect on long term seal performance caused by slight material formulation changes is noted. The value of performance testing of seal materials data to the material compounder is discussed.

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