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.

How Smithers Supports MIL-PRF-32287

Smithers provides independent testing and technical assessment for elastomer sealing materials used in demanding defense applications. Our specialists support material qualification, fluid compatibility assessment, accelerated aging studies, and performance evaluation to help organizations generate trusted technical evidence for qualification and long-term service performance.

Explore our Defense Materials and Qualification capabilities to learn more.

MIL-PRF-32287 provides a comprehensive framework for qualifying synthetic rubber O-ring packing joints used in demanding shipboard environments. The specification supports reliable sealing performance, material qualification, and long-term service durability in hydraulic applications.

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