N-SF2 by Schott

Preferred Unknown Environmentally Friendly

N-SF2 by Schott is a preferred optical glass. It transmits from 0.36 to 2.50 µm with an nd of 1.64769 and a Vd of 33.82. It has medium thermal expansion (CTE of 6.68×10⁻⁶/K), excellent chemical resistance, and low relative cost.

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) 1.64769
Abbe Number (Vd) 33.82
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.47343\,\lambda^2}{\lambda^2 - 0.0109019} + \frac{0.163682\,\lambda^2}{\lambda^2 - 0.0585684} + \frac{1.36921\,\lambda^2}{\lambda^2 - 127.405}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.68
TCE 100/300°C (10-6/K) 7.81
Thermal Conductivity (W/mK) 1.14
Heat Capacity (J/gK) 0.79
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.1 \times 10^{-6} + 2(1.75 \times 10^{-8})\,\Delta T + 3(6.62 \times 10^{-11})\,\Delta T^2 + \frac{7.51 \times 10^{-7} + 2(8.99 \times 10^{-10})\,\Delta T}{\lambda - 0.277}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.718
Relative Cost 1.4
Mechanical Properties
Young's Modulus (GPa) 86.0
Poisson's Ratio 0.23
Knoop Hardness (kgf/mm²) 539.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
FD2 Hoya 1.647693 33.836872
ZF1 CDGM 1.647693 33.836872
PBM22 Ohara 1.647689 33.802937
E-FD2 Hoya 1.64769 33.84
H-ZF1 CDGM 1.64769 33.840317
S-TIM22 Ohara 1.647689 33.792803
H-ZF1A CDGM 1.64769 33.887993
SF2 Sumita 1.64769 33.9
SF12 Sumita 1.64831 33.8
FD12 Hoya 1.648308 33.793909
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
SF2 Schott 1.64769 33.85
SF12 Schott 1.64831 33.841187
SF16 Schott 1.646112 34.049815
SF9 Schott 1.654461 33.651384
F6 Schott 1.636359 35.341176
N-SF19 Schott 1.66679 33.12
SF19 Schott 1.6668 33.005581
BASF2 Schott 1.66446 35.829357
N-BASF2 Schott 1.66446 36.0
BASF56 Schott 1.657149 36.735021
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