N-SF56 by Schott

Obsolete Unknown Environmentally Friendly

N-SF56 by Schott is an obsolete optical glass. It transmits from 0.38 to 2.50 µm with an nd of 1.7847 and a Vd of 26.1. It has medium thermal expansion (CTE of 8.7×10⁻⁶/K) and excellent chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.38–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.38–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.380–2.500 µm
Optical Properties
Refractive Index (nd) 1.7847
Abbe Number (Vd) 26.1
Dispersion Formula Sellmeier
Wavelength Range 0.38 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.73562\,\lambda^2}{\lambda^2 - 0.0129625} + \frac{0.317487\,\lambda^2}{\lambda^2 - 0.0612884} + \frac{1.95398\,\lambda^2}{\lambda^2 - 161.559}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.7
TCE 100/300°C (10-6/K) 10.0
Thermal Conductivity (W/mK) 0.94
Heat Capacity (J/gK) 0.7
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.13 \times 10^{-6} + 2(7.65 \times 10^{-9})\,\Delta T + 3(-1.12 \times 10^{-11})\,\Delta T^2 + \frac{9.9 \times 10^{-7} + 2(1.57 \times 10^{-9})\,\Delta T}{\lambda - 0.287}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.28
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 91.0
Poisson's Ratio 0.26
Knoop Hardness (kgf/mm²) 560.0
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
FDS30 Hoya 1.784701 26.102957
ZF51 CDGM 1.784701 26.075871
FDS3 Hoya 1.7847 26.057653
SFS3 Sumita 1.7847 26.2
PBH23 Ohara 1.784702 26.216753
PBH23W Ohara 1.784702 26.216753
S-TIH23 Ohara 1.784696 26.291221
TIH23 Ohara 1.784696 26.29817
SFLD11 Sumita 1.78472 25.9
K-SFLD11 Sumita 1.78472 25.9
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
SF56A Schott 1.7847 26.08
SFL56 Schott 1.7847 26.078312
SF11 Schott 1.78472 25.76
N-SF11 Schott 1.78472 25.68
LAF9 Schott 1.79504 28.393185
SF6 Schott 1.80518 25.43
SF6HT Schott 1.80518 25.43
SFL6 Schott 1.80518 25.39
N-SF6 Schott 1.80518 25.36
N-SF6HT Schott 1.80518 25.36
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