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Optical glass type S-LAL61Q: excellent acid resistance and maintains the mechanical strength of S-LAL61.
| Type | Code | nc | nd | nF | ng | vd | s.g. | Coloring |
|---|---|---|---|---|---|---|---|---|
| S-LAL61Q | 741526 | 1.73673 | 1.74100 | 1.75082 | 1.75854 | 52.60 | 4.09 | 360/300 |
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.
| S-LAL61Q (New product) | S-LAL61 (Current Product) | ||
| Eco Optical Glass | 〇 | 〇 | |
| Refractive index nd | 1.74100 | 1.74100 | |
| Abbe number vd | 52.60 | 52.64 | |
| CTE α (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 | |
Ohara Corporation Western Office
23141 Arroyo Vista, Suite 200
Rancho Santa Margarita, CA 92688
TEL: (949) 858-5700
FAX: (949) 585-5455
Ohara Corporation Eastern Office
50 Columbia Road, Branchburg
New Jersey 08876-3519
TEL: (908) 218-0100
FAX: (908) 218-1685
