F4 by Sumita

Obsolete Very Rare Environmentally Dangerous

F4 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.61659 and a Vd of 36.6. It has excellent chemical resistance and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.61659
Abbe Number (Vd) 36.6
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.54469 - 0.0085741\,\lambda^2 + 0.022583\,\lambda^{-2} + 0.000730272\,\lambda^{-4} - 6.57153 \times 10^{-6}\,\lambda^{-6} + 3.57291 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.57
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
F4 Hoya 1.616589 36.615561
F3 CDGM 1.616592 36.627394
F4 Schott 1.616592 36.628072
PBM4 Ohara 1.616588 36.632973
H-F3 CDGM 1.61659 36.651688
F4GTI CDGM 1.62005 36.430327
N-F2 Schott 1.62005 36.43
F2 Schott 1.62004 36.37
F2HT Schott 1.62004 36.37
F2HTi Schott 1.62004 36.37
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
F2 Sumita 1.62004 36.3
F3 Sumita 1.61293 36.9
F9 Sumita 1.62045 38.0
F1 Sumita 1.62588 35.6
F5 Sumita 1.60342 38.0
BASF1 Sumita 1.62606 39.1
F6 Sumita 1.63636 35.4
SF7 Sumita 1.6398 34.6
BASF3 Sumita 1.60717 40.2
F8 Sumita 1.59551 39.2
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