This specification covers a synthetic rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. Primarily for packing and sealing joints which come in contact with aircraft fuels, hot petroleum-base lubricating oils, and ethylene glycol from -20 to +220 degrees F (-29 to +104 degrees C) . This material has fair resistance to all fluids listed. Where better resistance to a particular fluid is required, use the AMS for material compounded specifically for good resistance to that fluid.