EPDM中文名：三元乙丙橡胶。

三元乙丙橡胶是乙烯、丙烯以及非共轭二烯烃的三元共聚物，1963年开始商业化生产。每年全世界的消费量是80万吨。EPDM最主要的特性就是其优越的耐氧化、抗臭氧和抗侵蚀的能力。由于三元乙丙橡胶属于聚烯烃家族，它具有极好的硫化特性。在所有橡胶当中，EPDM具有最低的比重。它能吸收大量的填料和油而影响特性不大。因此可以制作成本低廉的橡胶化合物。

三元乙丙是乙烯、丙烯和非共轭二烯烃的三元共聚物。二烯烃具有特殊的结构，只有两键之一的才能共聚，不饱和的双键主要是作为交链处。另一个不饱和的不会成为聚合物主链，只会成为边侧链。三元乙丙的主要聚合物链是完全饱和的。这个特性使得三元乙丙可以抵抗热，光，氧气，尤其是臭氧。三元乙丙本质上是无极性的，对极性溶液和化学物具有抗性，吸水率低，具有良好的绝缘特性。

在三元乙丙生产过程中，通过改变三单体的数量，乙烯丙烯比，分子量及其分布以及硫化的方法可以调整其特性。

Chinese name of EPDM: EPDM rubber.

EPDM is a terpolymer of ethylene, propylene and non-conjugated diolefins that began commercial production in 1963.It is consumed worldwide at 800,000 tons per year.The most important characteristic of EPDM is its superior resistance to oxidation, ozone and erosion.Since EPDM rubber belongs to the polyolefin family, it has excellent vulcanization properties.EPDM has the lowest specific gravity of all rubbers. It can absorb a large amount of filler and oil without affecting the characteristics much. As a result, low-cost rubber compounds can be made.

EPDM is a terpolymer of ethylene, propylene and non-conjugated diolefins.Diolefins have a special structure, only one of the two bonds can be copolymerized, and the unsaturated double bond is mainly used as a cross-chain. The other unsaturated one will not become the polymer backbone, but only the side chain.The main polymer chains of EPDM are fully saturated. This property makes EPDM resistant to heat, light, oxygen and especially ozone.EPDM is essentially non-polar, resistant to polar solutions and chemicals, has low water absorption, and has good insulating properties.

In the EPDM production process, its characteristics can be adjusted by varying the number of trimers, ethylene-propylene ratio, molecular weight and its distribution, and the method of vulcanization.

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