P-SF68 by Schott

Preferred Unknown Precision Molding Environmentally Friendly
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.42–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.42–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.420–2.500 µm
Optical Properties
Refractive Index (nd) 2.0052
Abbe Number (Vd) 21.0
Dispersion Formula Sellmeier
Wavelength Range 0.42 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{2.33301\,\lambda^2}{\lambda^2 - 0.0168838} + \frac{0.452961\,\lambda^2}{\lambda^2 - 0.0716086} + \frac{1.25172\,\lambda^2}{\lambda^2 - 118.707}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.43
TCE 100/300°C (10-6/K) 9.67
Thermal Conductivity (W/mK) 0.65
Heat Capacity (J/gK) 0.37
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.55 \times 10^{-5} + 2(2.3 \times 10^{-8})\,\Delta T + 3(-3.46 \times 10^{-11})\,\Delta T^2 + \frac{2.76 \times 10^{-6} + 2(2.93 \times 10^{-9})\,\Delta T}{\lambda - 0.297}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 6.194
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 79.04
Poisson's Ratio 0.28
Knoop Hardness (kgf/mm²) 404.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 5
Acid Resistance 53
Alkali Resistance 2
Phosphate Resistance 2
Notes

suitable for precision molding

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