Home / Standards / GB/T 3781.9-2025 GB/T 3781.9-2025 Active Acetylene black—Part 9:Determination of resistivity 乙炔炭黑 第9部分:电阻率的测定 Standard Type GBT ICS 83.040.20 CCS G 49 Status 现行 Issue Date 2025-08-29 Implementation 2026-03-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A