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Introducing a new optical glass for polished lenses.
Achieving industry-leading acid resistance [RA(P)] by powder method with ranges, nd: 1.74 or higher and vd: 50-55

We are pleased to announce the release of a new optical glass type named S-LAL61Q which has excellent acid resistance by powder method (nd1.74 or higher and νd50-55) and also maintains the mechanical strength of S-LAL61 which has been used for various applications for many years. This new material has the same optical performance (refractive index and Abbe number) as conventional products and is even easier to handle in lens processing. It also has various lens applications, such as in-vehicle cameras, projectors, and interchangeable lenses for photography.


  • Improved chemical durability (compared to conventional products)
    Acid resistance by powder method: Grade 3
  • Mechanical strength equivalent to S-LAL61
    Knoop hardness: 710[7]

(New product)
(Current Product)
Eco Optical Glass
Refractive index nd 1.74100 1.74100
Abbe number vd 52.60 52.64
(10 -7 K-1)
-30 ~ +70°C 57 57
+100 ~ +300°C 74 70
Transition point Tg (℃) 689 653
Yield point At (℃) 710 688
Coloring degree λ 80 360 365
λ 5 300 365
Chemical durability RW (P) 1 1
RA(P) 3 4
W(S) 3 1~2
SR 51.0 51.0
PR 2.0 2.0
Specific Gravity 4.09 4.04
Knoop hardness Hk 710〔7〕 720〔7〕
Abrasion degree Aa 66 71
Catalog data details Download PDF Download PDF



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