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Direct pressing blanks of optical glass

Direct-press blanks are directly dropped and pressed from melted glass.

Tolerances of outer diameters and thicknesses for DP are shown in  Table 15.

Table 15

 

External diameter of molded blank
(mm)

Direct pressing blank

External diatolerance
(mm)

Thickness tolerance
(mm)

<12

±0.10

±0.20

12~40

±0.15

±0.20

41~60

±0.20

±0.20

61~90

±0.30

±0.30

91~150

±0.40

±0.40

>150

±0.50

±0.50



 

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