SK2 by Sumita

Obsolete Very Rare Environmentally Dangerous

SK2 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.29 to 2.00 µm with an nd of 1.60738 and a Vd of 56.7. It has good chemical resistance and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.290–2.000 µm
Optical Properties
Refractive Index (nd) 1.60738
Abbe Number (Vd) 56.7
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.54095 - 0.00969683\,\lambda^2 + 0.0148143\,\lambda^{-2} + 0.000432516\,\lambda^{-4} - 2.40286 \times 10^{-5}\,\lambda^{-6} + 1.52382 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 6.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.53
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BACD2 Hoya 1.60738 56.72
H-ZK50GT CDGM 1.60738 56.654511
H-ZK50 CDGM 1.60738 56.654511
SK2 Schott 1.607381 56.650108
N-SK2 Schott 1.60738 56.65
N-SK2HT Schott 1.60738 56.65
C07-57 Corning 1.607504 56.610495
BSM2 Ohara 1.607379 56.815789
S-BSM2 Ohara 1.607379 56.816076
SK1 Schott 1.61025 56.712386
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SK1 Sumita 1.61025 56.5
K-VC79(M) Sumita 1.60737 57.2
VC79 Sumita 1.6097 57.8
K-VC79 Sumita 1.61035 57.9
SK9 Sumita 1.61405 55.1
K-SK4 Sumita 1.61272 58.6
SK4 Sumita 1.61272 58.6
SK10 Sumita 1.6228 56.9
K-SSK4 Sumita 1.61765 55.1
SSK4 Sumita 1.61765 55.1
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