1.1 These test methods cover the testing of rubber intended for use in applications in which the rubber will be subjected to compressive stresses in air or liquid media. They are applicable particularly to the rubber used in machinery mountings, vibration dampers, and seals. Three test methods are covered as follows: Test Method Section A—Compression Set Under Constant Force in Air 8 – 11 B—Compression Set Under Constant Deflection in Air 12 – 15 C—Compression Set Under