MIL-PRF-32287 is a performance specification covering O-ring packing joints destined for shipboard use. Specifically, the O-ring packings covered by MIL-PRF-32287 are made from synthetic rubbers that are resistant to petroleum-based hydraulic fluids that conform to MIL-PRF-87257 and MIL-PRF-83282.

MIL-PRF-32287 details the required physical properties of O-ring packings, including specific gravity, hardness, tensile strength and stress, elongation, temperature retraction, and corrosion adhesion. The spec also details physical property requirements after accelerated aging, including:
  • Changes in hardness and volume
  • Decreases in tensile strength and elongation
  • Compression set
  • Temperature retraction.
MIL-PRF-32287 also describes dynamic cycling testing for O-rings and careful examination for defects and workmanship. The spec either provides detailed instructions for conducting each of the required tests or lists where to find them.

MIL-PRF-32287 is a detailed specification for validating the performance of synthetic rubber O-ring packing joints. The spec ensures reliable performance of these components, even when exposed to hydraulic fluids while in service. 
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