Home / Standards / GB/T 34213-2017 GB/T 34213-2017 Abolished High purity alumina for sapphire substrate 蓝宝石衬底用高纯氧化铝 Standard Type GBT ICS 77.120.10 CCS H61 Status 废止 Issue Date 2017-09-07 Implementation 2018-06-01 Responsible Dept 国家标准委 Drafting Unit N/A