GB/T 13477.21-2022建筑密封材料试验方法第21部分:人工加速气候老化后颜色变化的测定国家标准
英文:Test method for building sealants—Part 21:Determination of color change after laboratory accelerated weathering proce...
英文:Test method for building sealants—Part 21:Determination of color change after laboratory accelerated weathering proce...