NF T53-040-1*NF EN ISO 21970-1:2019 Plastics - Polyketone (PK) moulding and extrusion materials - Part 1 : designation system and basis for specifications
2019NF T53-040-1*NF EN ISO 21970-1:2019 Plastics - Polyketone (PK) moulding and extrusion materials - Part 1 : designation system and basis for specifications