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S-NBH59 is an optical glass for polishing lens and effective for secondary chromatic aberration correction.


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.

1. Comparing with S-NBH51, θg, F is lower side: θg, F = 0.5792
2. The refractive index is higher than S-NBH51: nd = 1.76634



(New Product)

Eco Optical Glass Environmentally safe
Refractive Index nd 1.76634
Abbe Number νd 35.82
ΔnT relative
D line 40~60℃    (10-6 K-1)
Partial dispersion ratio θg,F 0.5792
Abnormal dispersibility ⊿θg.F -0.0043

(10-7 K-1)

-30~70℃ 82
+100~300℃ 103
Transformation Point Tg  Tg(℃) 526
Yield Point At At(℃) 572
Coloring λ80 395
λ5 325
Chemical Resistance 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 Aa 135
Detail Catalog DATA PDF

(Please consult us about product form of supply, available shapes, sizes and tolerances.)