GB/T 19510.202-2023 Chinese PDF (GB/T19510.202-2023) GB 31604.61-2025 12-2023_Chinese: Test method of impermeable

12-2023_Chinese: Test method of impermeable graphite materials - Part 12: Thermal conductivity (Chinese: 不透性石墨材料试验方法 第12部分：导热系数)

English versions: GB 28881-2023

English versions: GB/T 45070-2024

English versions: GB/T 45521-2025

2-2025_Chinese: Household electric direct-acting room heaters - Methods for measuring performance - Part 2: Additional provisions for the measurement of the radiant factor (Chinese: 家用直接作用式房间电加热器 性能测试方法 第2部分：辐射系数测量的附加规定)

GB/T 19510.202-2023 Chinese PDF (GB/T19510.202-2023) GB 31604.61-2025 12-2023_Chinese: Test method of impermeableGB T 19510. 202 2023_Chinese: Controlgear for electric light sources Part 2 2: Particular requirements for d. c. or a. c. supplied electronic step down convertors for filament lamps (Chinese: 2 2 ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 19510. 202 2023