Home / Standards / GB/T 35470-2017 GB/T 35470-2017 Active Natural sodium bentonite geosynthetic clay liner for rail transportation 轨道交通工程用天然钠基膨润土防水毯 Standard Type GBT ICS 91.120.30 CCS Q17 Status 现行 Issue Date 2017-12-29 Implementation 2018-11-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A