KS M 3333-2020 Plastics piping systems for pressure and non-pressure drainage and sewerage — Glass-reinforced thermosetting plastics(GRP) systems based on unsaturated polyester(UP) resin
2020KS M 3333-2020 Plastics piping systems for pressure and non-pressure drainage and sewerage — Glass-reinforced thermosetting plastics(GRP) systems based on unsaturated polyester(UP) resin
2005KS M 3333-2005 Plastics piping systems for pressure and non-pressure drainage and sewerage-Glass reinforced thermosetting plastics(GRP) systems based on unsaturated polyester(UP) resin
1995KS M 3333-1995 Plastics piping systems for pressure and non-pressure drainage and sewerage-Glass reinforced thermosetting plastics(GRP) systems based on unsaturated polyester(UP) resin