SK1 by Schott

Obsolete Unknown Environmentally Dangerous

SK1 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.61025 and a Vd of 56.712386. It has low thermal expansion (CTE of 6.1×10⁻⁶/K) and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.61025
Abbe Number (Vd) 56.712386
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.23998\,\lambda^2}{\lambda^2 - 0.00676461} + \frac{0.30883\,\lambda^2}{\lambda^2 - 0.0233831} + \frac{1.03366\,\lambda^2}{\lambda^2 - 114.586}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.1
TCE 100/300°C (10-6/K) 7.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.93 \times 10^{-6} + 2(1.6 \times 10^{-8})\,\Delta T + 3(-9.64 \times 10^{-11})\,\Delta T^2 + \frac{5.38 \times 10^{-7} + 2(5.24 \times 10^{-10})\,\Delta T}{\lambda - 0.175}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.56
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BACD1 Hoya 1.610248 56.650958
SK1 Sumita 1.61025 56.5
C07-57 Corning 1.607504 56.610495
BACD2 Hoya 1.60738 56.72
SK2 Sumita 1.60738 56.7
H-ZK50 CDGM 1.60738 56.654511
H-ZK50GT CDGM 1.60738 56.654511
BSM2 Ohara 1.607379 56.815789
S-BSM2 Ohara 1.607379 56.816076
C13-56 Corning 1.613498 56.417725
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
SK2 Schott 1.607381 56.650108
N-SK2HT Schott 1.60738 56.65
N-SK2 Schott 1.60738 56.65
SK6 Schott 1.61375 56.397311
SK8 Schott 1.611171 55.917724
P-SK60 Schott 1.61035 57.9
SK10 Schott 1.622801 56.903777
N-SK10 Schott 1.62278 56.98
SSK4A Schott 1.61765 55.141867
SK4 Schott 1.61272 58.629829
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