qingdao zhong yi da chemical co..ltd
we are one of the importers of dichloroethane,raw propylene,c4 raffinate-1 or 3,mixed c4 nad isobutane,if you have these products ,plz dont hesited to contact us or send me email to :qdzydhg@163.com ; sdyonghui@163.com. or call :+86 18669882266