SF4 by Schott

Preferred Unknown Environmentally Dangerous

SF4 by Schott is a preferred optical glass. It transmits from 0.36 to 2.50 µm with an nd of 1.7552 and a Vd of 27.58. It has medium thermal expansion (CTE of 8.0×10⁻⁶/K), average chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.365–2.500 µm
Optical Properties
Refractive Index (nd) 1.7552
Abbe Number (Vd) 27.58
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.61958\,\lambda^2}{\lambda^2 - 0.0125502} + \frac{0.339493\,\lambda^2}{\lambda^2 - 0.054456} + \frac{1.02567\,\lambda^2}{\lambda^2 - 117.652}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.0
TCE 100/300°C (10-6/K) 8.9
Thermal Conductivity (W/mK) 0.65
Heat Capacity (J/gK) 0.41
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.6 \times 10^{-6} + 2(1.7 \times 10^{-8})\,\Delta T + 3(-5.27 \times 10^{-11})\,\Delta T^2 + \frac{1.54 \times 10^{-6} + 2(1.46 \times 10^{-9})\,\Delta T}{\lambda - 0.266}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.79
Relative Cost 1.9
Mechanical Properties
Young's Modulus (GPa) 56.0
Poisson's Ratio 0.24
Knoop Hardness (kgf/mm²) 390.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 2
Acid Resistance 4
Alkali Resistance 2
Phosphate Resistance 3
Notes

lead containing glass type

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
D56-27 Corning 1.755203 27.591377
ZF6 CDGM 1.755205 27.546239
FD4 Hoya 1.755199 27.530242
H-ZF6 CDGM 1.7552 27.530047
E-FD4L Hoya 1.7552 27.53
E-FD4 Hoya 1.7552 27.53
PBH4W Ohara 1.755199 27.512146
PBH4 Ohara 1.755199 27.512146
S-TIH4 Ohara 1.755199 27.512089
SF4 Sumita 1.7552 27.5
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-SF4 Schott 1.75513 27.38
SFL4 Schott 1.7552 27.206054
SF63 Schott 1.7484 27.713565
SF55 Schott 1.7618 26.950177
SF14 Schott 1.76182 26.53
N-SF14 Schott 1.76182 26.53
SF13 Schott 1.740771 27.59998
SF54 Schott 1.7408 28.090813
SF3 Schott 1.74 28.2
SF10 Schott 1.72825 28.41
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