Adipic Acid, Propylene Glycol, Maleic Anhydride manufacturer / supplier in China, offering High Purity Deta (Diethylenetriamine) Epoxy Resin Hardener & Chemical Intermediate, Deta 99.5% for Epoxy Resin Harder and Polyamide Production Diethelenetriamine, Factory high Purity 99% Diethylenetriamine Deta for Epoxy Curing Agent & Chelating Agent and so on.