K-CSK158 by Sumita

Standard Rare Precision Molding Environmentally Friendly

K-CSK158 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.29 to 2.00 µm with an nd of 1.584 and a Vd of 56.9. It has medium thermal expansion (CTE of 9.0×10⁻⁶/K), average chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.290–2.000 µm
Optical Properties
Refractive Index (nd) 1.584
Abbe Number (Vd) 56.9
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.46815 - 0.00874877\,\lambda^2 + 0.0142855\,\lambda^{-2} + 0.000333517\,\lambda^{-4} - 1.33495 \times 10^{-5}\,\lambda^{-6} + 9.38827 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.0
TCE 100/300°C (10-6/K) 11.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.87 \times 10^{-6} + 2(1.28 \times 10^{-8})\,\Delta T + 3(-1.16 \times 10^{-10})\,\Delta T^2 + \frac{5.43 \times 10^{-7} + 2(5.44 \times 10^{-10})\,\Delta T}{\lambda - 0.179}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.06
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
IRGN6 Generic IR 1.589096 56.33564
BAC6 Hoya 1.574441 56.357089
H-BAK8 CDGM 1.5725 57.486797
BAC1 Hoya 1.572497 57.488684
B72-57 Corning 1.572498 57.494511
BAK1 Schott 1.5725 57.54931
N-BAK1 Schott 1.5725 57.55
SK13 Schott 1.591809 58.300621
BACD13 Hoya 1.59181 58.308789
S-BAL11 Ohara 1.572501 57.74298
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-CSK158(M) Sumita 1.58157 56.7
BAK1 Sumita 1.5725 57.5
K-SKLD200(M) Sumita 1.58355 58.8
K-SKLD200 Sumita 1.5866 59.0
BAK4 Sumita 1.56883 56.0
K-CSK120(M) Sumita 1.58445 59.2
SK12 Sumita 1.58313 59.3
K-SKLD120(M) Sumita 1.58401 59.5
CSK12 Sumita 1.5865 59.6
K-CSK120 Sumita 1.587 59.6
Compare Glasses
    Compare Selected