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SAE AMS7272 Revision G, April 1, 2013
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Rubber: Butadiene-Acrylonitrile (NBR) Synthetic Lubricant Resistant 65 – 75 Hardness For Seals in Synthetic Lubricant Systems
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AIA/NAS Aerospace Standards

This specification covers a butadiene-acrylonitrile (NBR) rubber in the form of molded rings, compression seals, o-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications.


These products have been used typically as sealing rings in contact with diester synthetic lubricants in service up 275 °F (135 °C), but usage is not limited to such applications. These products may not be suitable for use in high temperature stabilized, "HTS", engine oils (those conforming to MIL-PRF-23699 Class HTS, MIL-PRF-7808 Grade 4 and AS5780 Class HPC). The cross-section of such rings is usually not over 0.275 inch (6.98 mm) in diameter or thickness.

Safety - Hazardous Materials

While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.