Three Yuan second grade third rubbers (EPDM) is the ethylene, the propylene and the few non-conjugate diolefin copolymer.
三元乙丙橡胶（EPDM）是乙
、丙和少量非共轭
烃的共聚物。
;烃Three Yuan second grade third rubbers (EPDM) is the ethylene, the propylene and the few non-conjugate diolefin copolymer.
三元乙丙橡胶（EPDM）是乙、丙和少量非共轭烃的共聚物。
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.
烃和基芳烃是非
不稳定的组
，可聚合产生凝胶。对于给定烃和烷基芳烃，氢化可以改善产品质量。
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