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Home  > Products and Service  > Optical products  > New Glass Types  > S-LAH63Q
New Glass Types


S-LAH63Q is an optical glass with high refractive indices which has the smallest positive dn/dT at the region of LAH. In the optical system of Automotive camera lenses, it's common that the focal length is fixed. And cars are used in environments where the temperature change is large from below zero (in cold area) to more than 50 C (inside car in summer). So refractive indices fluctuations due to temperature change should be considered for the optical system. LAH glasses generally have positive large dn/dT. By using S-LAH63Q of which the dn/dT is close to zero, it is expected that refractive indices fluctuations due to temperature change can be adjusted efficiently. In addition, S-LAH63Q can be used for not only Automotive camera lenses but also Projectors, Photographic interchangeable lenses and various applications.

1.The smallest positive dn/dT at the region of LAH   (Dline 40℃~60℃) 1.6
2.Equivalent to S-LAH63 for nd and νd Different dn/dT can be selected from glasses with the
    same refractive index. 

(New Product)
(Current Product)
Eco Optical Glass
Refractive Index nd 1.80440 1.80440
Abbe Number νd 39.58 39.59
dn/dT relative
D Line 40~60°C
1.6 7.5
-30~70°C 79 58
+100~300°C 93 70
Transformation Point Tg(°C) 669 607
Yield Point At(°C) 701 630
Coloring λ80 415 410
λ5 345 340
Chemical ResistanceRW(P) 1 1
RA(P) 3 3
W(S) 3 1
SR 51.2 4.2
PR 1.0 1.0
Specific Gravity 4.45 4.34
Knoop Hardness Hk 580[6] 640[6]
Abrasion Aa 121 82
Detail Catalog DATA PDF PDF
Available shapes •pressing
•saw cut center-less
groundcylindrical blanks
•cut blanks
•saw cut center-less
groundcylindrical blanks
•cut blanks
Please consult us about available shapes,dimentions and tolerance.

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