Performance
1. Low density and high filling
The density of ethylene propylene rubber is a low rubber, its density is 0.87. In addition, a large amount of oil and filler can be added, thus reducing the cost of rubber products, making up for the high price of ethylene propylene rubber raw rubber, and for ethylene propylene rubber with high Mooney value, the reduction of physical mechanical energy after high filling is not large.
2. Aging resistance
Ethylene propylene rubber has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, oil filling and room temperature fluidity. Ethylene propylene rubber products can be used for a long time at 120 ℃, and can be used temporarily or intermittently at 150- 200 ℃. Adding suitable antioxidant can increase its use temperature. EPDM rubber crosslinked with peroxide can be used under harsh conditions. EPDM rubber can reach more than 150h without cracking under the conditions of ozone concentration of 50pphm and stretching of 30%.
3. Corrosion resistance
Due to the lack of polarity and low unsaturation of ethylene-propylene rubber, it has good resistance to various polar chemicals such as alcohols, acids, alkalis, oxidants, refrigerants, detergents, animal and vegetable oils, ketones and fats. However, it has poor stability in aliphatic and aromatic solvents (such as gasoline, benzene, etc.) and mineral oil. Under the long-term action of concentrated acid, the performance will also decrease.
4. Water and steam resistance
Ethylene propylene rubber has excellent water vapor resistance and is estimated to be superior to its heat resistance. In superheated steam at 230 ℃, the appearance has no change after nearly 100h. Fluororubber, silicone rubber, fluorosilicone rubber, butyl rubber, nitrile rubber, natural rubber, under the same conditions, the appearance of a relatively short period of time significantly deteriorated.
5. Resistance to superheated water
Ethylene-propylene rubber resistance to overheated water is also good, but is closely related to all vulcanization systems. The mechanical properties of ethylene-propylene rubber with dimorpholine disulfide and TMTD as vulcanization system changed little and the volume expansion rate was only 0.3% after immersion in superheated water at 125 ℃ for 15 months.
6. Electrical performance
Ethylene-propylene rubber has excellent electrical insulation properties and corona resistance, and its electrical properties are better than or close to those of styrene-butadiene rubber, chlorosulfonated polyethylene, polyethylene and cross-linked polyethylene.
7. Elasticity
Due to the non-polar substituents in the molecular structure of ethylene-propylene rubber, the molecular cohesion energy is low, and the molecular chain can maintain flexibility in a wide range, second only to natural rubber and butadiene rubber, and can still be maintained at low temperatures.
8. Adhesion
Ethylene propylene rubber due to the molecular structure of the lack of active groups, low cohesive energy, plus the rubber is easy to spray frost, self-adhesion and mutual adhesion is very poor.

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