Three Yuan second grade third rubbers (EPDM) is the ethylene, the propylene and the few non-conjugate diolefin copolymer.
三元
橡胶（EPDM）是
、和少量非共轭二烃的共聚物。
属;二属烃Three Yuan second grade third rubbers (EPDM) is the ethylene, the propylene and the few non-conjugate diolefin copolymer.
三元橡胶（EPDM）是、和少量非共轭二烃的共聚物。
The diolefins and alkenyl aromatics are very unstable components which can give gums by polymerization.In giving olefins and alky aromatics the hydrogenation improves the product quality.
二烃和基芳烃是非
不稳定的组分，
聚合产生凝胶。对于给定烃和烷基芳烃，
以改善产品质量。
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