Isobutylene is colorless gas, can form explosive mixtures with air, soluble in organic solvent, explosion limit of 1.7% ~ 1.7%, easily be aggregated, constitutional formula CH3=C(CH3)2.
Isobutylene is an important chemical raw material, mainly used for the preparation of butyl rubber, polyisobutylene, methacrylonitrile, antioxidants, tertiary butyl phenol, tert-butyl ether, etc.