ISO/BS/ASTM/AS PVC Conduit 1)Material: Virgin Grade VCM Resin; ... 80, SDR 21, SDR 26, SDR41)2) British standard (BS 3505, BS 5255, 4515)3) Singaporean standard (SS 141, SS 272, SS ... by the National QualitySupervision Testing Center of Plastic Products. ISO/BS/ASTM/AS PVC Conduit