3,3’,4,4’-benzophenonetetracarboxylic dianhydride(btda)
shandong huaxia shenzhou new material co., ltd.
domestic sales office：0533-8519966
e-mail：15553327277@huaxiashenzhou.com
foreign sales office：0533-8521777
e-mail：wakiezhou@huaxiashenzhou.com
