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. 

How Smithers Supports MIL-PRF-15624

Smithers supports defense manufacturers and suppliers through independent testing and technical assessment for elastomer gasket materials used in demanding defense applications. Our specialists help evaluate material performance, sealing characteristics, environmental durability, fluid compatibility, and long-term reliability to support qualification activities and generate trusted technical evidence for defense applications. 

Explore our Defense Materials and Qualification capabilities to learn more.

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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