Home / Standards / GB/T 46904-2026 GB/T 46904-2026 Upcoming Polycarbosilanes 聚碳硅烷 Standard Type GBT ICS 49.025.99 CCS V13 Status 即将实施 Issue Date 2026-01-28 Implementation 2026-08-01 Responsible Dept 国家标准委 Drafting Unit N/A