S-FPM5 is an optical glass for polished lenses with a Δn/ΔT that is close to zero.
11.30.2020
S-FPM5 is a glass material with a Δn / ΔT closer to zero than conventional FP-based glass materials and is expected to effectively correct refractive index fluctuations (temperature drift) due to temperature changes. In addition, it has a high partial dispersion ratio θg, F, which is a characteristic of FP-based glass materials and is effective for correcting secondary chromatic aberration. This glass material can be used, not only for in-vehicle camera lenses, but also for other applications such as projector and interchangeable lenses.
| S-FPM5 (New Product) |
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| Classification of environmental measures | Environmentally safe | |
| Refractive Index nd | 1.55200 | |
| Abbe Number νd | 70.70 | |
| Δn/ΔT relative D line 40～60℃ |
-2.8 | |
| Partial dispersion ratio θg,F | 0.5421 | |
| Abnormal dispersibility ⊿θg,F | 0.015 | |
| CTE α
(10-7/℃) |
-30～+70℃ | 109 |
| +100～+300℃ | 129 | |
| Transformation Point Tg(℃) | 474 | |
| Yield Point At(℃) | 503 | |
| Coloring | λ80 | 345 |
| λ5 | – | |
| Chemical Resistance | RW(P) | 1 |
| RA(P) | 2 | |
| W(S) | 1 | |
| SR | 52.1 | |
| PR | 4.0 | |
| Specific Gravity | 3.74 | |
| Knoop Hardness Hk | 410〔4〕 | |
| Abrasion Aa | 413 | |
| Detail Catalog DATA | ||
| Available shapes | ・Pressings ・Polished Preforms ・Polished Lenses ・Aspherical Glass Mold Lenses |
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(Please consult us about product form of supply, available shapes, sizes and tolerances.)