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New Glass Types


S-NPH4 is an optical glass featuring high dispersion similar to S-NPH2 and high transmittance similar to S-NPH1. S-NPH4 can be used to provide secondary color correction in products such as interchangeable lenses or zoom lenses. We are pleased to introduce S-NPH4 optical glass with these unique properties.

Eco Optical Glass
Refractive Index nd 1.89286 1.92286
Abbe Number νd 20.36 18.90
-30~70°C 73 67
+100~300°C 88 83
Transformation Point Tg(°C) 638 650
Yield Point At(°C) 668 676
Coloring λ70 410 440
λ5 380 390
Chemical ResistanceRW(P) 1 1
RA(P) 1 1
W(S) 1 1
SR 1.0 1.0
PR 1.0 1.0
Specific Gravity 3.61 3.58
Knoop Hardness Hk 440[4] 450[5]
Abrasion Aa 213 224
Detail Catalog DATA PDF PDF
Available shapes •pressing
•saw cut center-less
groundcylindrical blanks
•cut blanks
•saw cut center-less
groundcylindrical blanks
•polished ball
•cut blanks

Please consult us about available size and tolerance.

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