Home / Standards / GB/T 34504-2017 GB/T 34504-2017 Abolished Measurement method for surface metal contamination on sapphire polished substrate wafer 蓝宝石抛光衬底片表面残留金属元素测量方法 Standard Type GBT ICS 77.040 CCS H17 Status 废止 Issue Date 2017-10-14 Implementation 2018-05-01 Responsible Dept 国家标准委 Drafting Unit N/A