MIL-PRF-15624 covers three classes of synthetic rubbers:
  • Class I: Oil resistant, usually chloroprene rubber.
  • Class II: Non-oil resistant, usually butadiene-styrene rubber.
  • Class III: Fuel resistant, usually butadiene-acrylonitrile rubber.
The spec includes instructions on how to prepare samples from sheets, strips, and cut, molded, and extruded shapes.

MIL-PRF-15624 dictates that synthetic rubber materials are tested for tensile strength, ultimate elongation, hardness, specific gravity, and sealing pressure before undergoing any aging, to establish a baseline. Samples are tested again after oven aging, light aging, low temperature aging, and liquid immersion, to determine the effects of environmental conditions on the material. 

MIL-PRF-15624 is a valuable specification for validating the properties of synthetic rubber materials after environmental conditioning, a critical step to ensuring the quality of rubber gaskets.
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