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7.1 Strips 

A strip has two cut ends and four naturally formed surfaces. The glass is coarse or fine annealed.

7.2 Pressing blanks 

7.2.1 Direct-press blank (DP)

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                   units: mm

Outer diameter of pressing blanks

  DP products

Tolerance of outer diameter

Tolerance of centre thickness

<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

 

7.2.2 Reheated-press blank (RP)

 Reheated-press blanks are formed by reheated-press process.

Tolerances of outer diameters and thicknesses for RP are shown in Table 16.

      Table 16                    units: mm

Outer diameter of pressing blanks

 RP products

Tolerance of outer diameter

Tolerance of centre thickness

<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

  

7.3 Products cut from round rod 

    These products are cut from a precisely round rod formed on a center less grinding machine or by secondary drawn rod process.

Tolerances of outer diameters and thicknesses for products cut from round rod are shown in Table 17.

7.4 Products with specified shapes 

Products with special shapes (rectangles, prisms, etc.), specified sizes

7.5 Others 

    If any optical glass of special specification or large size is needed, please contact the salesman.

We have listed NHG’s glass types and corresponding types from HOYA, OHARA and SCHOTT. In this comparative table, types in the same line are only same or similar in glass codes, have nothing to do with glass composition.

 

                        

 

 

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