all Engineered plastic Optical raw material Alloy General purpose Others General purpose Others PVC PVC PS polystyrene PP polypropylene PE polyethylene ASA Acrylonitrile Styrene Acrylate AS Acrylonitrile styrene AES Acrylonitrile Ethylene Styrene PET polyethylene terephthalate TPE Thermoplastic elastomer ABS Acrylonitrile butadiene styrene