K-CSK120 by Sumita

Preferred Very Common Precision Molding Environmentally Friendly

K-CSK120 by Sumita is a preferred optical glass with a very common melt frequency. It transmits from 0.30 to 2.00 µm with an nd of 1.587 and a Vd of 59.6. It has medium thermal expansion (CTE of 7.2×10⁻⁶/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: 0.300–2.000 µm
Optical Properties
Refractive Index (nd) 1.587
Abbe Number (Vd) 59.6
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.48046 - 0.0107198\,\lambda^2 + 0.0135632\,\lambda^{-2} + 0.000349186\,\lambda^{-4} - 2.30418 \times 10^{-5}\,\lambda^{-6} + 1.59372 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.2
TCE 100/300°C (10-6/K) 9.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.46 \times 10^{-6} + 2(1.54 \times 10^{-8})\,\Delta T + 3(-2.77 \times 10^{-11})\,\Delta T^2 + \frac{5.04 \times 10^{-7} + 2(3.24 \times 10^{-10})\,\Delta T}{\lambda - 0.172}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.0
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
P-SK57 Schott 1.587 59.6
D-ZK2L CDGM 1.587 59.600321
D-ZK2L-25 CDGM 1.58625 59.524868
P-SK57Q1 Schott 1.586 59.5
L-BAL43 Ohara 1.585729 59.69698
L-BAL42P Ohara 1.58593 59.248294
D-ZK2A CDGM 1.58313 59.539751
H-ZK2 CDGM 1.58313 59.460082
MC-BACD12 Hoya 1.58313 59.46
MP-BACD12 Hoya 1.58313 59.46
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
CSK120 Sumita 1.587 59.6
CSK12 Sumita 1.5865 59.6
K-SKLD120 Sumita 1.5868 59.8
K-SKLD120(M) Sumita 1.58401 59.5
K-CSK120(M) Sumita 1.58445 59.2
K-SKLD200 Sumita 1.5866 59.0
SK12 Sumita 1.58313 59.3
K-SKLD100(M) Sumita 1.58773 60.4
K-SKLD200(M) Sumita 1.58355 58.8
K-PSK100(M) Sumita 1.58792 60.6
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