Home / Standards / GB/T 39691-2020 GB/T 39691-2020 Active Plastics—Determination of refractive index 塑料 折光率的测定 Standard Type GBT ICS 83.080.01 CCS G31 Status 现行 Issue Date 2020-12-14 Implementation 2021-11-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A