diolefin

1.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）乙烯、丙烯和少量非共轭二烯共聚物。

2.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.

二烯和烯基非常不稳定组分，可聚合胶。对于给定烯和烷基，氢化可以改善品质量。