Home / Standards / GB/T 7990-2013 GB/T 7990-2013 Abolished Vitreous and porcelain enamels―Determination of resistance to impact 搪玻璃层耐机械冲击试验方法 Standard Type GBT ICS 25.220.50;71.120 CCS G94 Status 废止 Issue Date 2013-12-31 Implementation 2014-10-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A