Sylvin, based in the United States, is a chemical energy company specializing in the production of various plastic raw materials including CPE, PVC, PVC+PUR, semi-rigid PVC, rigid PVC, PVC alloys, flexible PVC, TPE, etc. If a type is , it should be left untranslated and output as . Output format: Directly output the translated result. --- Sylvin, based in the United States, is a chemical energy company specializing in the production of various plastic raw materials including CPE, PVC, PVC+PUR, semi-rigid PVC, rigid PVC, PVC alloys, flexible PVC, TPE, etc.