P-SF8 by Schott

Preferred Unknown Precision Molding Environmentally Friendly

P-SF8 by Schott is a preferred optical glass. It transmits from 0.36 to 2.50 µm with an nd of 1.68893 and a Vd of 31.25. It has medium thermal expansion (CTE of 9.41×10⁻⁶/K), excellent chemical resistance, and precision molding compatibility.

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) 1.68893
Abbe Number (Vd) 31.25
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.5537\,\lambda^2}{\lambda^2 - 0.0116583} + \frac{0.206333\,\lambda^2}{\lambda^2 - 0.0582088} + \frac{1.39709\,\lambda^2}{\lambda^2 - 130.748}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.41
TCE 100/300°C (10-6/K) 11.1
Thermal Conductivity (W/mK) 1.02
Heat Capacity (J/gK) 0.79
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.27 \times 10^{-6} + 2(8.16 \times 10^{-9})\,\Delta T + 3(-2 \times 10^{-11})\,\Delta T^2 + \frac{9.02 \times 10^{-7} + 2(1.22 \times 10^{-9})\,\Delta T}{\lambda - 0.272}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.898
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 86.06
Poisson's Ratio 0.25
Knoop Hardness (kgf/mm²) 533.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Notes

suitable for precision molding

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
C89-31 Corning 1.689004 31.210861
SF8 Sumita 1.68893 31.2
K-SFLD8W Sumita 1.6891 31.2
ZF10 CDGM 1.688934 31.184753
H-ZF10 CDGM 1.68893 31.16057
MC-FD80 Hoya 1.68893 31.16
M-FD80 Hoya 1.68893 31.16
E-FD8 Hoya 1.68893 31.16
MP-FD80 Hoya 1.68893 31.16
FD8 Hoya 1.688931 31.158857
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-SF8 Schott 1.68894 31.31
SF8 Schott 1.688932 31.176063
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
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