SF3 by Schott

Preferred Unknown Environmentally Dangerous

SF3 by Schott is a preferred optical glass. It transmits from 0.36 to 2.33 µm with an nd of 1.74 and a Vd of 28.2. It has medium thermal expansion (CTE of 8.4×10⁻⁶/K), average chemical resistance, moderate relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.365–2.325 µm
Optical Properties
Refractive Index (nd) 1.74
Abbe Number (Vd) 28.2
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.57231\,\lambda^2}{\lambda^2 - 0.0120382} + \frac{0.339661\,\lambda^2}{\lambda^2 - 0.0531604} + \frac{1.03594\,\lambda^2}{\lambda^2 - 120.005}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.4
TCE 100/300°C (10-6/K) 9.5
Thermal Conductivity (W/mK) 0.71
Heat Capacity (J/gK) 0.423
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.72 \times 10^{-6} + 2(1.74 \times 10^{-8})\,\Delta T + 3(-3.21 \times 10^{-11})\,\Delta T^2 + \frac{1.49 \times 10^{-6} + 2(1.41 \times 10^{-9})\,\Delta T}{\lambda - 0.26}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.64
Relative Cost 4.2
Mechanical Properties
Young's Modulus (GPa) 56.0
Poisson's Ratio 0.24
Knoop Hardness (kgf/mm²) 380.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 2
Acid Resistance 4
Alkali Resistance 2
Phosphate Resistance 2
Notes

lead containing glass type

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SF3 Sumita 1.74 28.2
ZF5 CDGM 1.739999 28.245048
FD3 Hoya 1.739999 28.245048
PBH3 Ohara 1.739998 28.283809
PBH3W Ohara 1.739998 28.287409
H-ZF5 CDGM 1.74 28.295649
S-TIH3 Ohara 1.739998 28.296005
D40-28 Corning 1.740001 28.102623
PBH13 Ohara 1.740769 27.793228
PBH13W Ohara 1.740769 27.793228
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
SF54 Schott 1.7408 28.090813
SF13 Schott 1.740771 27.59998
SF63 Schott 1.7484 27.713565
SF10 Schott 1.72825 28.41
N-SF10 Schott 1.72828 28.53
SF53 Schott 1.728301 28.68667
SF4 Schott 1.7552 27.58
N-SF4 Schott 1.75513 27.38
SFL4 Schott 1.7552 27.206054
P-SF69 Schott 1.7225 29.23
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