Abstract： The C5 Fraction derived from ethylene steamcracker contains some very useful components, isoprene, cyclopentadiene and piperylene.

摘 要： 来自裂解乙烯的C5馏份含有非常有用的化工原料——烯、烯、间烯。

There is no isoprene rubber production industry in China at present which shows properous business opportunity in isoprene rubber production.

目前国内尚没有橡胶生产企业，橡胶产品商机无限。