N-SK2 by Schott

Preferred Unknown Environmentally Friendly

N-SK2 by Schott is a preferred optical glass. It transmits from 0.31 to 2.50 µm with an nd of 1.60738 and a Vd of 56.65. It has low thermal expansion (CTE of 6.0×10⁻⁶/K), good chemical resistance, and low relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.31–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.31–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.500 µm
Optical Properties
Refractive Index (nd) 1.60738
Abbe Number (Vd) 56.65
Dispersion Formula Sellmeier
Wavelength Range 0.31 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.28189\,\lambda^2}{\lambda^2 - 0.00727192} + \frac{0.257738\,\lambda^2}{\lambda^2 - 0.0242824} + \frac{0.968186\,\lambda^2}{\lambda^2 - 110.378}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.0
TCE 100/300°C (10-6/K) 7.1
Thermal Conductivity (W/mK) 0.78
Heat Capacity (J/gK) 0.595
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.8 \times 10^{-6} + 2(1.41 \times 10^{-8})\,\Delta T + 3(2.28 \times 10^{-11})\,\Delta T^2 + \frac{6.44 \times 10^{-7} + 2(8.03 \times 10^{-11})\,\Delta T}{\lambda - 0.108}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.55
Relative Cost 1.2
Mechanical Properties
Young's Modulus (GPa) 78.0
Poisson's Ratio 0.26
Knoop Hardness (kgf/mm²) 550.0
Chemical Resistance
Climatic Resistance 2
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 1
Phosphate Resistance 2
Notes

step 0.5 available

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-ZK50GT CDGM 1.60738 56.654511
H-ZK50 CDGM 1.60738 56.654511
C07-57 Corning 1.607504 56.610495
SK2 Sumita 1.60738 56.7
BACD2 Hoya 1.60738 56.72
BSM2 Ohara 1.607379 56.815789
S-BSM2 Ohara 1.607379 56.816076
BACD1 Hoya 1.610248 56.650958
SK1 Sumita 1.61025 56.5
K-VC79(M) Sumita 1.60737 57.2
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-SK2HT Schott 1.60738 56.65
SK2 Schott 1.607381 56.650108
SK1 Schott 1.61025 56.712386
SK8 Schott 1.611171 55.917724
SK6 Schott 1.61375 56.397311
P-SK60 Schott 1.61035 57.9
SSK4A Schott 1.61765 55.141867
SK10 Schott 1.622801 56.903777
SK4 Schott 1.61272 58.629829
N-SK4 Schott 1.61272 58.63
Compare Glasses
    Compare Selected