Home / Standards / GB/T 30857-2014 GB/T 30857-2014 Active Standard test method for thickness and thickness variation on sapphire substrates 蓝宝石衬底片厚度及厚度变化测试方法 Standard Type GBT ICS 77.040 CCS H21 Status 现行 Issue Date 2014-07-24 Implementation 2015-04-01 Responsible Dept 国家标准委 Drafting Unit N/A