Home / Standards / GB/T 631-2026 GB/T 631-2026 Upcoming Chemical reagent—Ammonia solution 化学试剂 氨水 Standard Type GBT ICS 71.040.30 CCS G62 Status 即将实施 Issue Date 2026-02-27 Implementation 2026-09-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A