S-LAL7Q which has improved on chemical durability and in processability of lens polishing.
08.31.2018
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.
(Advantages)
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
| S-LAL7Q (New Product) |
S-LAL7 (Current Product) |
||
|---|---|---|---|
| Eco Optical Glass | ○ | ○ | |
| Refractive Index nd | 1.65160 | 1.65160 | |
| Abbe Number νd | 58.54 | 58.55 | |
| CTE α (10-7/℃) |
-30～70℃ | 55 | 67 |
| +100～300℃ | 70 | 81 | |
| Transformation Point Tg(°C) | 620 | 617 | |
| Yield Point At(°C) | 646 | 658 | |
| Coloring | λ80 | 365 | 345 |
| λ5 | – | 275 | |
| Chemical Resistance | RW(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 | |||
| Available shapes |
•pressing
•saw cut center-less groundcylindrical blanks •cut blanks |
•pressing
•saw cut center-less groundcylindrical blanks •cut blanks |
|