... material, adding a small amount of antioxidants, anti-UV absorbers and pigments.15 years of OEM experience, with CE, ISO9001, ... ISO14001 certificates, high quality and competitive price.product quality refers to ISO4427, DIN 8074, ASTM ... toxic, does not scale. it is not easy to form dirt, and avoids secondary pollution of drinking water3.Excellent wear resistanceits ...