SF8 by Schott

Obsolete Unknown Environmentally Dangerous

SF8 by Schott is an obsolete optical glass. It transmits from 0.35 to 2.50 µm with an nd of 1.688932 and a Vd of 31.176063. It has medium thermal expansion (CTE of 8.2×10⁻⁶/K), good chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.350–2.500 µm
Optical Properties
Refractive Index (nd) 1.688932
Abbe Number (Vd) 31.176063
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.49514\,\lambda^2}{\lambda^2 - 0.011499} + \frac{0.26253\,\lambda^2}{\lambda^2 - 0.051717} + \frac{0.969568\,\lambda^2}{\lambda^2 - 113.459}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 9.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.7 \times 10^{-6} + 2(1.72 \times 10^{-8})\,\Delta T + 3(-4.66 \times 10^{-11})\,\Delta T^2 + \frac{1.27 \times 10^{-6} + 2(1.19 \times 10^{-9})\,\Delta T}{\lambda - 0.254}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.22
Relative Cost 2.25
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 2
Alkali Resistance 2
Phosphate Resistance 2
Notes

old

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
ZF10 CDGM 1.688934 31.184753
H-ZF10 CDGM 1.68893 31.16057
MP-FD80 Hoya 1.68893 31.16
E-FD8 Hoya 1.68893 31.16
M-FD80 Hoya 1.68893 31.16
MC-FD80 Hoya 1.68893 31.16
FD8 Hoya 1.688931 31.158857
SF8 Sumita 1.68893 31.2
K-SFLD8W Sumita 1.6891 31.2
C89-31 Corning 1.689004 31.210861
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
P-SF8 Schott 1.68893 31.25
N-SF8 Schott 1.68894 31.31
N-SF15 Schott 1.69892 30.2
SF15 Schott 1.69895 30.07
SF5 Schott 1.6727 32.21
N-SF5 Schott 1.67271 32.25
SF64A Schott 1.70585 30.299703
N-SF64 Schott 1.70591 30.23
SF19 Schott 1.6668 33.005581
N-SF19 Schott 1.66679 33.12
Compare Glasses
    Compare Selected