Secondary pressing blanks of optical glass
Reheated-press blanks are formed by reheated-press process.
Tolerances of outer diameters and thicknesses for RP are shown in Table 16.
Table 16
External diameter of molded blank（mm） | Secondary pressing blank | |
External diatolerance (mm) | Thickness tolerance (mm) | |
＜10 | ±0.10 | +0.6/0 |
10~20 | ±0.10 | +0.5/0 |
20~40 | ±0.15 | +0.5/0 |
40~60 | ±0.20 | +0.5/0 |
60~150 | ±0.30 | +0.6/0 |
＞150 | ±0.50 | +0.8/0 |