Zibo Dongda Chem.Ind. Stock Co.,Ltd. and Zibo Dongda Hongfang Chemical Co., Ltd . is engaged in research, production, and sale over 50years. It is the key enterprises in ion exchange resin industry, with the capacity of 50,000 tons which was listed as the top of nation. The company has advanced technology and abundant experiences on waste water treatment, and established the first national ion exchanged resin institute. The company has developed more than 100 kinds of 9 series, such as strong acid, weak acid, strong base, wake base, chelating resin, catalyzing resin, chromatographic separation resin, special resin, etc......