S-FPM4 is an optical glass for polishing lens and effective for secondary chromatic aberration correction in FPM Region.
08.20.2019
S-FPM4 has high partial dispersion ratios θg,F in the FPM region, and is an optical glass for polishing lenses that is effective for secondary chromatic aberration correction. A glass material that can be used in a wide range of applications, such as interchangeable and automotive lenses.
(Advantage)
High partial dispersion ratios θg,F
S-FPM4 | ||
Eco Optical Glass | ○ | |
Refractive Index nd | 1.52841 | |
Abbe Number νd | 76.46 | |
Partial dispersion ratio θg,F | 0.5396 | |
Abnormal dispersibility ⊿θg.F | 0.0218 | |
CTE α (10-7/℃) |
-30~+70℃ | 123 |
+100~+300℃ | 143 | |
Transformation Point Tg(°C) | 488 | |
Yield Point At(°C) | 520 | |
Coloring | λ80 | 340 |
λ5 | – | |
Chemical Resistance | RW(P) | 1 |
RA(P) | 3 | |
W(S) | 1 | |
SR | 51.3 | |
PR | 4.3 | |
Specific Gravity | 3.76 | |
Knoop Hardness Hk | 360〔4〕 | |
Abrasion Aa | 506 | |
Detail Catalog DATA | ||
Available shapes | •pressings •saw cut center-less ground cylindrical blanks •cut blanks |