shanghai greatsun industry co., ltd. one of the leading manufactory of maleic anhydride and fumaric acid in china.we have productions base in shanxi province.shanxi province is rich in coal resources,coal used to produce benzene as raw materials for maleic anhydride. and our manufactory have ISO9002 certificate,our output of maleic anhydride is fifty thousand ton per year,up to now maleic anhydride export is more than ten thousand ton per year, annual export turn-over around USD15,000,000
