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New Glass Types
 

S-NBH57

S-NBH57 is an optical glass with both high index and high dispersion. (Nd 1.85025; Vd 30.0)
S-NBH57 also has a higher index and lower partial dispersion ratio θ g,F when compared to S-NBH55. By combining it with anomalous dispersion glasses having both low refractive index and low dispersion, S-NBH57 can be effective for correcting chromatic aberration. We are pleased to introduce S-NBH57 optical glass with these unique properties to provide advantages in technical design.


  S-NBH57
Eco Optical Glass
Refractive Index nd 1.85025
Abbe Number νd 30.05
CTE α
(10-7/°C)
-30~70°C 77
+100~300°C 92
Transformation Point Tg(°C) 625
Yield Point At(°C) 679
Coloring λ70 410
λ5 355
Chemical ResistanceRW(P) 1
RA(P) 1
W(S) 1
SR 3.0
PR 1.0
Specific Gravity 4.00
Knoop Hardness Hk 560 [6]
Abrasion Aa 140
Detail Catalog DATA PDF

Available shape are pressing, saw cut center-less ground cylindrical blanks, cut blanks.
Please consult us about available size and tolerance.


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