Home / Standards / GB/T 21283.5-2008 GB/T 21283.5-2008 Active Rotary shaft lip-type seals incorporating thermoplastic sealing elements - Part 5: Identification of visual imperfections 密封元件为热塑性材料的旋转轴唇形密封圈 第5部分 外观缺陷的识别 Standard Type GBT ICS 83.140.50;23.100.60 CCS G43 Status 现行 Issue Date 2008-05-14 Implementation 2008-10-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A