Optical glass type S-LAL12Q: improved chemical durability and lower specific gravity than S-LAL12.
| Type | Code | nc | nd | nF | ng | vd | s.g. | Coloring |
|---|---|---|---|---|---|---|---|---|
| S-LAL12Q | 678553 | 1.67417 | 1.67790 | 1.68642 | 1.69307 | 55.35 | 3.59 | 380/- |
S-LAL12Q is an optical glass with improved workability and durability, which can be an issue for glasses in the S-LAL family. With the same optical performance (refractive index and Abbe number) as S-LAL12, the new S-LAL12Q offers improved properties for lens fabrication processes. S-LAL12Q is ideal for use various applications, such as in-vehicle camera lenses, projectors, and interchangeable lenses for photography.
| COMPARISON | S-LAL12Q (New product) | S-LAL12 (Conventional product) | |
| Environmental measures category | ○ | ○ | |
| Refractive index nd | 1.67790 | 1.67790 | |
| Abbe number vd | 55.35 | 55.34 | |
| Linear expansion coefficient α (10 -7 /℃) | -30 ~ +70°C | 49 | 72 |
| +100 ~ +300°C | 59 | 86 | |
| Transition point Tg (℃) | 689 | 652 | |
| Yield point At (℃) | 717 | 679 | |
| Coloring degree | λ 80 | 380 | 360 |
| λ 5 | 310 | 285 | |
| Chemical durability | RW (P) | 1 | 2 |
| RA(P) | 3 | Five | |
| W(S) | 2 | 2 | |
| SR | 51.0 | 53.0 | |
| PR | 3.0 | 4.2 | |
| Specific Gravity | 3.59 | 4.01 | |
| Knoop hardness Hk | 700 (7) | 560 (6) | |
| Abrasion degree Aa | 62 | 166 | |
| Product supply form | ・Pressed products ・Round bar cut product ・Cut/rounded products | ・Pressed products ・Round bar cut product ・Cut/rounded products | |
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