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S-FPM5 is an optical glass for polished lenses with a Δn/ΔT that is close to zero.


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.

(New Product)
Classification of environmental measures Environmentally safe
Refractive Index nd 1.55200
Abbe Number νd 70.70
ΔnT relative
D line 40~60℃
Partial dispersion ratio θg,F 0.5421
Abnormal dispersibility ⊿θg,F 0.015


-30~+70℃ 109
+100~+300℃ 129
Transformation Point Tg(℃) 474
Yield Point At(℃) 503
Coloring λ80 345
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 PDF
Available shapes ・Pressings
・Polished Preforms
・Polished Lenses
・Aspherical Glass Mold Lenses

(Please consult us about product form of supply, available shapes, sizes and tolerances.)