SF11 by Schott

Preferred Unknown Environmentally Dangerous

SF11 by Schott is a preferred optical glass. It transmits from 0.39 to 2.50 µm with an nd of 1.78472 and a Vd of 25.76. It has low thermal expansion (CTE of 6.1×10⁻⁶/K), excellent chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.39–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.39–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.390–2.500 µm
Optical Properties
Refractive Index (nd) 1.78472
Abbe Number (Vd) 25.76
Dispersion Formula Sellmeier
Wavelength Range 0.39 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.73848\,\lambda^2}{\lambda^2 - 0.0136069} + \frac{0.311169\,\lambda^2}{\lambda^2 - 0.061596} + \frac{1.17491\,\lambda^2}{\lambda^2 - 121.923}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.1
TCE 100/300°C (10-6/K) 6.8
Thermal Conductivity (W/mK) 0.74
Heat Capacity (J/gK) 0.431
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.12 \times 10^{-5} + 2(1.81 \times 10^{-8})\,\Delta T + 3(-5.03 \times 10^{-11})\,\Delta T^2 + \frac{1.46 \times 10^{-6} + 2(1.58 \times 10^{-9})\,\Delta T}{\lambda - 0.282}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.74
Relative Cost 1.7
Mechanical Properties
Young's Modulus (GPa) 66.0
Poisson's Ratio 0.24
Knoop Hardness (kgf/mm²) 450.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Notes

lead containing

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
ZF13 CDGM 1.784724 25.754051
D85-25 Corning 1.784752 25.799504
H-ZF13 CDGM 1.78472 25.720045
H-ZF13GT CDGM 1.78472 25.720045
FD110 Hoya 1.78472 25.72
PBH11 Ohara 1.784718 25.712726
PBH11W Ohara 1.784718 25.712726
FD11 Hoya 1.784715 25.704276
SF11W Sumita 1.78472 25.7
SF11 Sumita 1.78472 25.7
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-SF11 Schott 1.78472 25.68
SFL56 Schott 1.7847 26.078312
SF56A Schott 1.7847 26.08
N-SF56 Schott 1.7847 26.1
SF6 Schott 1.80518 25.43
SF6HT Schott 1.80518 25.43
SFL6 Schott 1.80518 25.39
N-SF6 Schott 1.80518 25.36
N-SF6HT Schott 1.80518 25.36
N-SF6HTultra Schott 1.80518 25.36
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