As a leading manufacturer, the main products of Hangzhou Haichem Co., Ltd. cover hair dyes, active pharmaceutical ingredients and special intermediates like derivatives of pyridine, pyrazole, and indole. We have two production bases and one R&D center with experienced chemists. By handling hydrogenation, chlorination, ethoxylation, acetylation, alkylation, amination (substitution), diazotization, nitration, nitrosation, cyclization, sulphonation, esterification, etherification, salt ...