SAE AMS7601
Rubber: Butyl (IIR) Low Compression Set and Low Moisture/Gas Permeability 65 to 75 Type A Hardness for Seals in Desiccated or Other Systems Requiring Resistance to Gas and/or Water Vapor Permeation
standard by SAE International, 07/18/2019
SAE AMS7338A
Rubber: Butyl (IIR Abbreviation) Phosphate Ester Resistant 65 to 75 Hardness for Seals in Hydraulic Systems, etc. (Stabilized: Jul 2019)
standard by SAE International, 07/18/2019