1.1 This standard specifies the nomenclature for the thermoplastic material polybutene (PB). This nomenclature can be used as the basis for specifications. …
JIS K 6925-1:1997 history
1997JIS K 6925-1:1997 Plastics -- Polybutene (PB) moulding and extrusion materials -- Part 1: Designation system and basis for specifications