SSKN8 by Schott

Obsolete Unknown Environmentally Dangerous

SSKN8 by Schott is an obsolete optical glass. It transmits from 0.35 to 2.33 µm with an nd of 1.61772 and a Vd of 49.771451. It has medium thermal expansion (CTE of 7.1×10⁻⁶/K), good chemical resistance, moderate relative cost, 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: 0.350–2.325 µm
Optical Properties
Refractive Index (nd) 1.61772
Abbe Number (Vd) 49.771451
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.46998\,\lambda^2}{\lambda^2 - 0.00903675} + \frac{0.0963559\,\lambda^2}{\lambda^2 - 0.0450076} + \frac{1.02611\,\lambda^2}{\lambda^2 - 108.329}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.1
TCE 100/300°C (10-6/K) 8.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.27 \times 10^{-7} + 2(1.14 \times 10^{-8})\,\Delta T + 3(-7.72 \times 10^{-12})\,\Delta T^2 + \frac{6.33 \times 10^{-7} + 2(8.35 \times 10^{-10})\,\Delta T}{\lambda - 0.185}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.33
Relative Cost 3.02
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 2
Phosphate Resistance 2
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-BSM28 Ohara 1.617722 49.815052
BSM28 Ohara 1.617722 49.83232
K-SSK9 Sumita 1.62012 49.8
SSK9 Sumita 1.62012 49.8
BACED9 Hoya 1.620119 49.823001
K-SSK3 Sumita 1.61484 51.1
SSK3 Sumita 1.61484 51.1
BACED3 Hoya 1.614838 51.1513
BSM23 Ohara 1.614839 51.172377
BAF5 Hoya 1.607292 49.336899
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-SSK8 Schott 1.61773 49.83
N-SSK20 Schott 1.62568 50.2
SSK3 Schott 1.614837 51.1603
SSK50 Schott 1.617954 52.609086
BAF8 Schott 1.62374 47.000909
N-BAF52 Schott 1.60863 46.6
SSK2 Schott 1.622301 53.154887
BAF52 Schott 1.608589 46.44241
N-SSK2 Schott 1.62229 53.27
KZFS6 Schott 1.591965 48.509579
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