MIL-PRF-25732 is a performance specification covering acrylonitrile-butadiene rubber, also called NBR rubber for aerospace and aeronautical applications. Specifically, this spec covers molding rings, molded compression seals and O-ring cord, and molded-in-place gaskets made of 100% virgin NBR rubber.

The NBR rubber covered by MIL-PRF-25732 is resistant to petroleum-based hydraulic fluids and can handle temperatures ranging from -65°F (-54°C) to 250°F (121°C). Specific design requirements or exposure to other fluids while in service may impact the material’s temperature range. Users should consider the unique conditions of the intended service environment when determining whether this material will meet their needs.

MIL-PRF-25732 details the physical property requirements of applicable NBR rubber rings, seals, and gaskets, including specific gravity, tensile strength and stress, corrosion and adhesion resistance, hardness durometer, temperature retraction, volume change, compression set, and others. The spec includes requirements for both batch and acceptance lot tests.

MIL-PRF-25732 is a highly detailed specification designed to test the quality of NBR rubber rings, seals, O-rings cord, and gaskets. This spec is a valuable tool for ensuring performance of critical aerospace and aeronautical components.
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