Home / Standards / GB/T 5019.4-2025 GB/T 5019.4-2025 Active Insulating materials based on mica—Part 4:Mica paper 以云母为基的绝缘材料 第4部分:云母纸 Standard Type GBT ICS 29.035.50 CCS K15 Status 现行 Issue Date 2025-08-01 Implementation 2026-02-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A