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New Glass Types


We are pleased to introduce S-LAL7Q as an optical glass which has improved on chemical durability desired in the region of LAL. S-LAL7Q has the same Refractive Indices and Abbe Number as S-LAL7. In addition, the processability of lens polishing of S-LAL7Q is better than S-LAL7.

1. Improved chemical durability compared to S-LAL7
    Powder method Acid resistance is improved to Class 4 from Class 5
    Powder method Water resistance is improved to Class 2 from Class 3
2.Lower Specific Gravity compared to S-LAL7
    Specific Gravity 3.24 from 3.73

(New Product)
(Current Product)
Eco Optical Glass
Refractive Index nd 1.65160 1.65160
Abbe Number νd 58.54 58.55
-30~70°C 55 67
+100~300°C 70 81
Transformation Point Tg(°C) 620 617
Yield Point At(°C) 646 658
Coloring λ80 365 345
λ5 - 275
Chemical ResistanceRW(P) 2 3
RA(P) 4 5
W(S) 3 2~3
SR 52.0 53.0
PR 4.0 4.0
Specific Gravity 3.24 3.73
Knoop Hardness Hk 680〔7〕 560[6]
Abrasion Aa 75 136
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 size and tolerance.

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