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 AMS7601

This specification covers a butyl rubber in the form of molded rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications. For sheet, strip, tubing, extrusions, and molded shapes use AMS3941 specification.