Why Twin???. TOP 10 Chemical enterprises in China . Over 12 years of experience . Wholly owned production plant (48500 square meters). Sales to more than 76 countries . 10 main products with competitive prices. High quality products with perfect service Twin International Co., Limited is a modern enterprise for production,sale, export and trade of chemicals.Twin International,one of the biggest manufacturer and exporter of water treatment chemicals and pharmaceutical intermediates such as: Aluminum Chlorohydrate(ACH), Amino acids, Potassium Bromide(KBR),PBTC,SMFP,ATMP,SAP,Ammonium Bromide,,Plant extract oils(TTO),etc.