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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.


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


  S-FPM5 (New product)
Classification of environmental measures Environmentally safe
Refractive index nd 1.76634
Abbe number vd 35.82
ΔnT relative
D line 40~60℃
Partial dispersion ratio θg,F 0.5792
Abnormal dispersibility ⊿θg,F -0.0043
(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
Catalog data details Download PDF
Available Shapes

Please contact us about product form of supply, available shapes, sizes and tolerances.


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