Home / Standards / GB/T 37991-2019 GB/T 37991-2019 Active Measuring method for ultra-thin glass reheating line shrinkage—Dilatometer method 超薄玻璃再热线收缩率测试方法 膨胀仪法 Standard Type GBT ICS 81.040.30 CCS Q34 Status 现行 Issue Date 2019-08-30 Implementation 2020-07-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A