SSK4 by Sumita

Obsolete Very Rare Environmentally Dangerous

SSK4 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.61765 and a Vd of 55.1. It has average 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: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.61765
Abbe Number (Vd) 55.1
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.56822 - 0.00806861\,\lambda^2 + 0.0180627\,\lambda^{-2} - 0.00035372\,\lambda^{-4} + 9.68788 \times 10^{-5}\,\lambda^{-6} - 4.99689 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 7.3
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) 3.63
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
C17-55 Corning 1.617605 55.123455
SSK4A Schott 1.61765 55.141867
BSM24 Ohara 1.617646 55.049782
BACED4 Hoya 1.617652 55.15751
H-ZK8 CDGM 1.61405 55.116283
BACD9 Hoya 1.614047 55.118097
S-BSM9 Ohara 1.614047 54.990097
BSM9 Ohara 1.614047 54.971106
S-BSM21 Ohara 1.617195 54.062144
BSM21 Ohara 1.617196 54.040511
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-SSK4 Sumita 1.61765 55.1
SK9 Sumita 1.61405 55.1
K-SSK1 Sumita 1.6172 54.0
SSK1 Sumita 1.6172 54.0
SK1 Sumita 1.61025 56.5
SK10 Sumita 1.6228 56.9
SSK2 Sumita 1.6223 53.1
SK2 Sumita 1.60738 56.7
K-VC79(M) Sumita 1.60737 57.2
K-SK18RH Sumita 1.63854 55.5
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