Introducing a new optical glass for polished lenses: S-LAL61Q achieves industry-leading acid resistance [RA(P)] by powder method with ranges, nd: 1.74 or higher and vd: 50-55.
01.13.2023
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.
1. Improved chemical durability (compared to conventional products)
Acid resistance by powder method: Grade 3
2. Mechanical strength equivalent to S-LAL61
Knoop hardness: 710[7]
| S-LAL61Q
(New Product) |
S-LAL61
(Current Product) |
||
| Eco Optical Glass | ○ | ○ | |
| Refractive Index nd | 1.74100 | 1.74100 | |
| Abbe Number νd | 52.60 | 52.64 | |
| CTE α
(10-7K-1) |
-30～+70℃ | 57 | 57 |
| +100～+300℃ | 74 | 70 | |
| Transformation Point Tg(°C) | 689 | 653 | |
| Yield Point At(°C) | 710 | 688 | |
| Coloring | λ80 | 360 | 365 |
| λ5 | 300 | 280 | |
| Chemical Resistance | 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 Aa | 66 | 71 | |
| Detail Catalog DATA | |||