... ringHas excellent heat resistance, cold resistance, smelly itch, anti-air aging properties. There are good insulating property. Poor tensile ... -55 °C ~ 120 °C.IIR (butyl rubber) sealsExcellent air tightness, heat resistance, sunlight resistance, smelly itchy, good insulation properties; ... strength and elongation. But easy to aging in the air, when heated, becomes sticky, and easy expansion and ...