1.1 This standard specifies the nomenclature of thermoplastic polyethylene (PS) materials. This nomenclature can be used as the basis for specifications. …
JIS K 6923-1:1997 history
1997JIS K 6923-1:1997 Plastics -- Polystyrene (PS) moulding and extrusion materials -- Part 1: Designation system and basis for specifications