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 |