Home / Standards / GB/T 6509 GB/T 6509 Active Determination of caprolactam and oligomers content in polycaprolactam (PA6) chip and fibre 聚己内酰胺（PA6）切片和纤维中己内酰胺及低聚物含量的测定 Standard Type GBT ICS 59.060.20 CCS W50 Status 现行 Issue Date 2025-08-29 Implementation 2026-03-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委