... and conforming to the following International Standards:1) American standard (ASTM Sch 40 & Sch 80, SDR 21, SDR 26, SDR41)2) British ... K 6741, JIS K 6743, JIS K 6739)6) National standard (GB 10002, GB 5836, GB 14823, GB 13664)7) ... Stabilizing Compounds from Esteemed Chemical Manufacturers in the field;Experience: Over 40 years of experience in Thermoplastic Extrusion and Injection;Quality Assurance ...