Puyang Yingtaiyuan Industry Limited Company, a joint-stock enterprise, was established in 1988 under the verification and the approval of the Ministry of Foreign Trade.we have the certificate of ISO9001 and ISO14001.as a professional chemical factory ,we can offer you the OEM service of DMH.The DMH's production ability is more than 2000 tons per year.and the purity of DMH is more than 99.5%,which is the highest comparing with the other products in China.