F4 by Schott

Obsolete Rare Environmentally Dangerous

F4 by Schott is an obsolete optical glass with a rare melt frequency. It transmits from 0.32 to 2.50 µm with an nd of 1.616592 and a Vd of 36.628072. It has medium thermal expansion (CTE of 8.3×10⁻⁶/K), good chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.32–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.32–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–2.500 µm
Optical Properties
Refractive Index (nd) 1.616592
Abbe Number (Vd) 36.628072
Dispersion Formula Sellmeier
Wavelength Range 0.32 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.33906\,\lambda^2}{\lambda^2 - 0.0099222} + \frac{0.205224\,\lambda^2}{\lambda^2 - 0.0470001} + \frac{0.89786\,\lambda^2}{\lambda^2 - 107.937}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.3
TCE 100/300°C (10-6/K) 9.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.02 \times 10^{-6} + 2(1.97 \times 10^{-8})\,\Delta T + 3(-3.87 \times 10^{-11})\,\Delta T^2 + \frac{7.05 \times 10^{-7} + 2(4.36 \times 10^{-10})\,\Delta T}{\lambda - 0.289}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.58
Relative Cost 2.5
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 2
Phosphate Resistance 2
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
F3 CDGM 1.616592 36.627394
PBM4 Ohara 1.616588 36.632973
F4 Hoya 1.616589 36.615561
H-F3 CDGM 1.61659 36.651688
F4 Sumita 1.61659 36.6
F4GTI CDGM 1.62005 36.430327
F4 CDGM 1.620047 36.35673
H-F4 CDGM 1.62005 36.345886
F3 Sumita 1.61293 36.9
C20-36 Corning 1.62001 36.30126
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-F2 Schott 1.62005 36.43
F2HTi Schott 1.62004 36.37
F2 Schott 1.62004 36.37
F2HT Schott 1.62004 36.37
F2G12 Schott 1.62072 36.56
F3 Schott 1.612931 37.038954
FN11 Schott 1.620962 36.179463
F13 Schott 1.622372 36.043399
F9 Schott 1.620451 38.080601
F1 Schott 1.625882 35.700495
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