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Optical glass type S-NBH59: higher refractive index and smaller partial dispersion ratio compared to S-NBH51.
| Type | Code | nc | nd | nF | ng | vd | s.g. | Coloring |
|---|---|---|---|---|---|---|---|---|
| S-NBH59 | 766358 | 1.76004 | 1.76634 | 1.78143 | 1.79382 | 35.82 | 3.47 | 395/325 |
S-NBH59 is an optical glass for polishing lenses that has a higher refractive index than the S-NBH51 and has a smaller partial dispersion ratio of θg and F.
These features are effective in reducing the thickness of optical lenses and correcting secondary chromatic aberration.
This glass material that can be used in a wide range of applications, such as interchangeable and projector lenses. We propose S-NBH59, which is effective for improving the performance of your products.
| S-NBH59 (New Product) | ||
| Classification of environmental measures | Environmentally safe | |
| Refractive index nd | 1.76634 | |
| Abbe number vd | 35.82 | |
| Δn/ΔT relative D line 40～60℃ | 3.9 | |
| Partial dispersion ratio θg,F | 0.5792 | |
| Abnormal dispersibility ⊿θg,F | -0.0043 | |
| CTE α (10 -7 /℃) | -30 ~ +70°C | 82 |
| +100 ~ +300°C | 103 | |
| Transition point Tg (℃) | 526 | |
| Yield point At (℃) | 572 | |
| Coloring degree | λ 80 | 395 |
| λ 5 | 325 | |
| Chemical durability | RW(P) | 1 |
| RA(P) | 1 | |
| W(S) | 3 | |
| SR | 1.0 | |
| PR | 1.0 | |
| Specific Gravity | 3.47 | |
| Knoop hardness Hk | 610 (6) | |
| Abrasion degree Aa | 135 | |
| Available Shapes | Please contact us about product form of supply, available shapes, sizes and tolerances. | |
Ohara Corporation Western Office
23141 Arroyo Vista, Suite 200
Rancho Santa Margarita, CA 92688
TEL: (949) 858-5700
FAX: (949) 585-5455
Ohara Corporation Eastern Office
50 Columbia Road, Branchburg
New Jersey 08876-3519
TEL: (908) 218-0100
FAX: (908) 218-1685
