120 KS M ISO 7391-1-2006 2006-06-08 Korean Plastics - Polycarbonate(PC) moulding and extrusion materials - Part 1: Designation system and basis for specifications 121 KS M ISO 1163-1-2006 2006-06-08 Korean Plastics - Unplasticized poly(vinyl chloride)(PVC-U) moulding and extrusion material...