TIANJIN CHENGYI INTERNATIONAL TRADING CO.,LIMITED is a professional chemical manufacturer, Our sister company Shanxi Yuanping, who is one of the leading professional manufacturer. We produce full series Oxalic Acid, Oxalate Salt and Oxalate Ester. Formic acid ,Formate Salt. Sulfamic Acid and Sulfamate Salt etc. We started chemical producing from 1975 year. Our own products have REACH registration.A professional chemical exporter, who have more than 20 years experiences, service our customers fro...