Home / Standards / GB/T 20831 GB/T 20831 Active Method of test for the thermal endurance of surface insulation coatings of electrical sheet and strip 电工钢带(片)绝缘涂层热耐久性测试方法 Standard Type GBT ICS 77.040.99 CCS H21 Status 现行 Issue Date 2025-08-29 Implementation 2026-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit 中国钢铁工业协会