Profile: Zhangjiagang Gangda Chemical Co., Ltd. manufactures fine chemicals. We also produce bisphenol S series and its ramification, amino-triazole series, intermediates of dyestuff, medicine and pesticide, and acid nylonfix series. We are an ISO 9001:2000 certified company. Our 4,4'-dihydroxydiphenyl sulfone can dissolve in alcohol, acetonitrile, dimethyl sulfoxide, basic solution, heated water, and slightly dissolve in cool water. It is widely used as the raw material of polycarbonate, epoxy resin, polyether sulfone, and thermal material.