EPDM is ethylene, propylene and non-conjugated diene terpolymer, began commercial production in 1963. Annual worldwide consumption of 80 million tons. EPDM main feature is its excellent resistance to oxidation, ozone and anti-erosion ability. EPDM rubber is the polyolefin family, it has excellent curing characteristics. Among all the rubber, EPDM has the lowest proportion. It can absorb a lot of filler and oil not affect the properties.因此 low-cost production of rubber compounds. EPDM is ethylene, propylene and non-conjugated diene terpolymer. Diene has a special structure, one of only two keys copolymer, unsaturated double bonds mainly as cross-linking at. It does not become another unsaturated polymer main chain, will become the edge side chain. EPDM main polymer chain is completely saturated. This feature makes the EPDM is resistant to heat, light, oxygen, in particular ozone. EPDM is essentially non-polar, polar solvents and chemical resistant, low water absorption, good insulating properties. In the EPDM production process, by varying the amount of three monomer ratio, molecular weight and its distribution and vulcanized ethylene propylene may adjust its properties. EPDM ethylene and propylene as the main raw material synthesis, anti-aging, outstanding electrical insulation properties and ozone resistance. EPDM can be a lot of oil-filled and filling carbon black, lower product prices, good ethylene-propylene rubber, chemical stability, abrasion resistance, flexibility, oil and styrene butadiene rubber closer. Use EPDM is very wide as the tire side, strips and tubes and automotive components, can also be used as wire and cable sheathing and high-pressure, high pressure insulating material. Also manufacturing and shoes, hygiene products and other light products. Performance and Improvement EPDM: 1, low density and high filling: density ethylene-propylene rubber is less of a rubber having a density of 0.87. Coupled to a large number of oil-filled and a filler, which can reduce the cost of rubber products, make up the ethylene-propylene rubber adhesive shortcomings of high prices, and the high Mooney value of ethylene-propylene rubber, a highly filled mechanical energy after a reduction in not. 2, anti-aging: EPDM has excellent resistance to weather, ozone, heat, acid, water vapor, color stability, electrical properties, oil-filled and normal mobility. Ethylene-propylene rubber can be long-term use at 120 ℃, may be short or intermittent use at 150- 200 ℃ in. Adding a suitable antioxidant can improve its operating temperature. In peroxide crosslinking of EPDM rubber can be used under harsh conditions. EPDM rubber in ozone concentration 50pphm, stretching under the condition of 30%, up more than 150h does not crack. 3, corrosion resistance: Because EPDM lack polar, unsaturated low, so the various polar chemicals such as alcohols, acids, alkalis, oxidizing agents, refrigerants, detergents, animal and vegetable oils, ketones and fat etc. It has good resistance to; but in the case of aliphatic and aromatic genus solvents (such as gasoline, benzene, etc.) and mineral oil is less stable. In the long-term effects of concentrated acid also decrease performance. Gathered in ISO / TO 7620 in nearly 400 kinds of corrosive gaseous and liquid chemicals on a variety of information on the role of rubber properties, and provides 1-4 indicates the extent of its effect, on the corrosion properties of rubber chemicals : Level volume swelling ratio /% performance impact on reducing the value of hardness 1 <10 <10 little or no serious 210-2030 4. Water vapor resistance: EPDM has excellent water vapor resistance and heat resistance than estimated . Superheated steam at 230 ℃, no change in appearance after nearly 100h. The fluorine rubber, silicone rubber, fluoro silicone rubber, butyl rubber, nitrile rubber, natural rubber under the same conditions, a relatively short time through the apparent deterioration in the appearance of the phenomenon. 5, resistance to hot water performance: ethylene-propylene rubber resistant to hot water performance is also good, but is closely related to all curing systems. In disulfide morpholino, TMTD as ethylene-propylene rubber vulcanization system, at 125 ℃ superheated water, soak for 15 months after the change in mechanical properties is very small, only 0.3% volume expansion. 6, the electrical properties: EPDM has excellent electrical insulation properties and corona resistance, electrical performance is superior or close to styrene-butadiene rubber, chlorosulfonated polyethylene, polyethylene, and cross-linked polyethylene. 7, Flexible: Because the molecular structure EPDM polar substituents, the molecule can gather low molecular chain flexibility can be maintained over a wide range, second only to natural rubber and butadiene rubber, and at low temperatures can still maintain . 8, adhesion: ethylene-propylene rubber due to the molecular structure of the lack of active groups, the cohesive energy is low, with rubber easy-blooming, self-adhesive and mutual adhesiveness is poor.