Ohara Glass Catalog / Technical Information

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Table of Contents

1. Designation of Optical Glass Types

2. Optical Properties

2.1 Refractive Index
2.2 Dispersion
2.3 Dispersion Formula
2.4 Effect of Temperature on Refractive Index (dn/dt)
2.5 Refractive Indices in Ultraviolet and Infrared Range
2.6 Internal Transmittance (Ti)

3. Thermal Properties

3.1 Strain Point (StP)
3.2 Annealing Point (AP)
3.3 Softening Point (SP)
3.4 Transformation Temperature (Tg) and Yield Point (At)
3.5 Linear Coefficient of Thermal Expansion (Alpha)
3.6 Thermal Conductivity (k)

4. Chemical Properties

4.1 Water Resistance RW(p) and Acid Resistance RA(p) (Powder Method)
4.2 Weathering Resistance W(s) (Surface Method)
4.3 ISO Method
4.3.1 Acid Resistance (SR)
4.3.2 Phosphate Resistance (PR)

5. Mechanical Properties

5.1 Modulus of Elasticity
5.2 Knoop Hardness (Hk)
5.3 Abrasion (Aa)
5.4 Photoelastic Constant (Beta)

6. Other Properties

6.1 Bubbles and Inclusions
6.2 Colouring
6.3 Specific Gravity (d)

7. Guarantees of Quality

7.1 Refractive Index and Abbe Number
7.2 Homogeneity
7.3 Stress Birefringence
7.4 Striae
7.5 Bubble Quality
7.6 Colouring

8. Forms of Supply

8.1 Raw Glass
8.1.1 Strip Glass
8.1.2 Slab Glass
8.2 Pressings (Reheat Pressings - RP)
8.3 Cut Blanks
8.4 Saw cut Centre-less Ground Cylindrical Blanks
8.5 Mouldings
8.6 High Homogeneity Glass
8.7 Fine Gob (FG)

9. Table of Recommended Glasses

10. i-Line Glasses

10.1 Internal Transmittance (Ti)
10.2 Solarization
10.3 Optical Homogeneity
10.4 Refractive Index (ni) Variation within one Lot (Sn Standard)
10.5 Refractive Index Tolerance
10.6 Table of i-Line Glasses

11. Low Tg Glasses


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