P-SF69 by Schott

Preferred Unknown Precision Molding Environmentally Friendly

P-SF69 by Schott is a preferred optical glass. It transmits from 0.36 to 2.50 µm with an nd of 1.7225 and a Vd of 29.23. It has medium thermal expansion (CTE of 8.99×10⁻⁶/K) 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) 1.7225
Abbe Number (Vd) 29.23
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.62595\,\lambda^2}{\lambda^2 - 0.0121697} + \frac{0.235928\,\lambda^2}{\lambda^2 - 0.060071} + \frac{1.67435\,\lambda^2}{\lambda^2 - 145.652}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.99
TCE 100/300°C (10-6/K) 11.13
Thermal Conductivity (W/mK) 1.12
Heat Capacity (J/gK) 0.82
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.55 \times 10^{-6} + 2(5.68 \times 10^{-9})\,\Delta T + 3(-2.85 \times 10^{-11})\,\Delta T^2 + \frac{9.5 \times 10^{-7} + 2(1.54 \times 10^{-9})\,\Delta T}{\lambda - 0.275}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.934
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 95.88
Poisson's Ratio 0.25
Knoop Hardness (kgf/mm²) 612.0
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

suitable for precision molding

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
CD120 Sumita 1.7225 29.2
K-CD120 Sumita 1.7225 29.2
S-TIH18 Ohara 1.721507 29.23233
FD18 Hoya 1.721507 29.243436
PBH18 Ohara 1.721506 29.243262
SF18 Sumita 1.72151 29.3
FD20 Hoya 1.720225 29.300359
SFN1 Sumita 1.72022 29.3
D17-29 Corning 1.717409 29.492751
H-ZF3 CDGM 1.71736 29.49911
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
SF18 Schott 1.72151 29.245495
SF1 Schott 1.71736 29.51
N-SF1 Schott 1.71736 29.62
SF53 Schott 1.728301 28.68667
N-SF10 Schott 1.72828 28.53
SF10 Schott 1.72825 28.41
N-SF64 Schott 1.70591 30.23
SF64A Schott 1.70585 30.299703
SF3 Schott 1.74 28.2
SF54 Schott 1.7408 28.090813
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