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Development Glass Types
 

S-NPH3

S-NPH3 is a glass material with even higher dispersion than S-NPH2, with which appropriate correction of chromatic aberration is possible.
Its refractive index (nd) exceeds 1.95. We also recommend it as an effective glass material for thinner optical systems.


  S-NPH3 S-NPH2
Eco Optical Glass
Refractive Index nd 1.95906 1.92286
Abbe Number νd 17.5
17.47
18.9
18.90
CTE α
(10-7/°C)
-30~70°C 58 67
+100~300°C 71 83
Transformation Point Tg(°C) 669 650
Yield Point At(°C) 703 676
Coloring λ70 440 440
λ5 400 390
Chemical ResistanceRW(P) 1 1
RA(P) 1 1
W(S) - 1
SR - 1.0
PR - 1.0
Specific Gravity 3.59 3.58
Knoop Hardness Hk 500[5] 450[5]
Abrasion Aa 217 224
Detail Catalog DATA During the data acquisition PDF
Available shapes •pressing
•saw cut center-less
groundcylindrical blanks
•polished ball
•cut blanks
•pressing
•saw cut center-less
groundcylindrical blanks
•polished ball
•cut blanks

Please note that the physical properties may change, since they are data obtained during development.
Please consult us about available size and tolerance.

 
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