The main chain of EPDM rubber is composed of chemically stable saturated hydrocarbons and contains only unsaturated double bonds in the side chain, so it is basically a kind of saturated rubber. Because there are no polar substituents in the molecular structure and the intermolecular cohesive energy is low, the flexibility of the molecular chain can be maintained in a wide temperature range. The chemical structure of ethylene-propylene rubber (EPR) gives its vulcanized products unique properties.
EPDM extrusion rubber is a low density rubber with a density of 0.87. In addition, a large amount of oil and fillers can be added, thus reducing the cost of rubber products, making up for the high price of raw EPDM rubber, and for High Mooney value EPDM rubber, the decrease of physical and mechanical properties is small after high filling.
The Ethylene propylene rubber has excellent weather resistance, ozone resistance, heat resistance, acid and Alkali Resistance, water vapor resistance, color stability, electrical properties, oil resistance and room temperature fluidity. EPDM rubber products can be used for a long time at 120 °C, between 150 °C and 200 °C. C can be used temporarily or intermittently. The application temperature can be raised by adding suitable anti-aging agent. EPDM rubber crosslinked with peroxide can be used under more stringent conditions. When the concentration of ozone is 50 ~ 10, the tensile strength of EPDM rubber is 30% , and it can not crack for more than 150h.
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