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New Glass Types


L-LAH91 is a tantalum-free optical glass recommended for glass molding applications. Located in the same area as S-LAH66, By reducing usage of expensive raw materials, L-LAH91 provides significant cost reduction. In addition, when used in aspherical lens designs that might otherwise utilize S-LAH66 polished lens blanks, L-LAH91 can be used in more than 1 element for products such as interchangeable lenses. We are pleased to introduce L-LAH91 glass with these unique properties to provide advantages in technical design and decreased production costs.

Eco Optical Glass
Refractive Index nd 1.76450
Abbe Number νd 49.09
-30~70°C 57
+100~300°C 71
Transformation Point Tg(°C) 611
Yield Point At(°C) 644
Coloring λ80 365
λ5 275
Chemical ResistanceRW(P) 1
RA(P) 4
W(S) 2
SR 52.2
PR 2
Specific Gravity 4.29
Knoop Hardness Hk 680[7]
Abrasion Aa 50
Detail Catalog DATA PDF
Available shapes •pressing
•saw cut center-less
groundcylindrical blanks
•polished ball
Please consult us about available size and tolerance.
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