N-SF64 by Schott

Obsolete Unknown Environmentally Friendly

N-SF64 by Schott is an obsolete optical glass. It transmits from 0.37 to 2.50 µm with an nd of 1.70591 and a Vd of 30.23. It has medium thermal expansion (CTE of 8.48×10⁻⁶/K) and excellent chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.37–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.37–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.370–2.500 µm
Optical Properties
Refractive Index (nd) 1.70591
Abbe Number (Vd) 30.23
Dispersion Formula Sellmeier
Wavelength Range 0.37 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.59164\,\lambda^2}{\lambda^2 - 0.0118623} + \frac{0.219908\,\lambda^2}{\lambda^2 - 0.0594585} + \frac{1.46929\,\lambda^2}{\lambda^2 - 133.311}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.48
TCE 100/300°C (10-6/K) 9.78
Thermal Conductivity (W/mK) 0.98
Heat Capacity (J/gK) 0.75
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.06 \times 10^{-6} + 2(9.78 \times 10^{-9})\,\Delta T + 3(-1.67 \times 10^{-11})\,\Delta T^2 + \frac{8.67 \times 10^{-7} + 2(1.23 \times 10^{-9})\,\Delta T}{\lambda - 0.279}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.989
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 88.0
Poisson's Ratio 0.25
Knoop Hardness (kgf/mm²) 620.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-TIH20 Ohara 1.70585 30.244176
C99-30 Corning 1.699002 30.107427
S-TIM35 Ohara 1.698947 30.127865
PBM35 Ohara 1.698947 30.121211
ZF11 CDGM 1.698949 30.065686
E-FD15L Hoya 1.69895 30.05
E-FD15 Hoya 1.69895 30.05
FD15 Hoya 1.698945 30.050548
H-ZF11 CDGM 1.69894 30.05045
SF15 Sumita 1.69895 30.0
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
SF64A Schott 1.70585 30.299703
N-SF15 Schott 1.69892 30.2
SF15 Schott 1.69895 30.07
N-SF1 Schott 1.71736 29.62
SF1 Schott 1.71736 29.51
SF18 Schott 1.72151 29.245495
P-SF69 Schott 1.7225 29.23
SF8 Schott 1.688932 31.176063
P-SF8 Schott 1.68893 31.25
N-SF8 Schott 1.68894 31.31
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