技术规格:

材料.....................................................................见下表

外径公差......................................................+0/-0.10mm

厚度公差..........................................................±0.20mm

有效孔径................................................80% of diameter

平行度......................................................<3 arc minutes

光洁度............................................60–40 scratch and dig

镀膜...............单面镀保护银膜,Ravg≥95% (400nm–20mm)