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Polyprene thermoplastic compound rubber. Withstands a wide variety of temperature extremes: remains stable and keeps it shape from -76°F to 250°F. Soft good low temperature flexibility. More wear resistant than Silicone rubber. Low compression set – outstanding memory for consistent long-term sealing pressure. Unaffected by sunlight, ozone and ultraviolet rays. Fatigue resistance – unsurpassed flex fatigue resistance.