1999NF T53-036-1:1999 Plastics. Styrene/acrylonitrile (SAN) moulding and extrusion materials. Part 1 : designation system and basis for specifications.
1991NF T53-036-1:1991 PLASTICS. STYRENE/ACRYLONITRILE (SAN) COPOLYMER MOULDING AND EXTRUSION MATERIALS. PART 1 : DESIGNATION.