K-SKLD120 by Sumita

Standard Rare Precision Molding Environmentally Friendly

K-SKLD120 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.27 to 2.00 µm with an nd of 1.5868 and a Vd of 59.8. It has low thermal expansion (CTE of 6.4×10⁻⁶/K), good 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: 0.270–2.000 µm
Optical Properties
Refractive Index (nd) 1.5868
Abbe Number (Vd) 59.8
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.48093 - 0.0117638\,\lambda^2 + 0.0133095\,\lambda^{-2} + 0.000325456\,\lambda^{-4} - 9.96431 \times 10^{-6}\,\lambda^{-6} + 2.07909 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.4
TCE 100/300°C (10-6/K) 8.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.57 \times 10^{-6} + 2(1.39 \times 10^{-8})\,\Delta T + 3(-1.08 \times 10^{-10})\,\Delta T^2 + \frac{5.35 \times 10^{-7} + 2(5.99 \times 10^{-10})\,\Delta T}{\lambda - 0.138}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.64
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
L-BAL43 Ohara 1.585729 59.69698
D-ZK2L CDGM 1.587 59.600321
P-SK57 Schott 1.587 59.6
D-ZK2L-25 CDGM 1.58625 59.524868
P-SK57Q1 Schott 1.586 59.5
D-ZK2A CDGM 1.58313 59.539751
L-BAL42P Ohara 1.58593 59.248294
H-ZK2 CDGM 1.58313 59.460082
M-BACD12 Hoya 1.58313 59.46
MC-BACD12 Hoya 1.58313 59.46
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
CSK120 Sumita 1.587 59.6
K-CSK120 Sumita 1.587 59.6
CSK12 Sumita 1.5865 59.6
K-SKLD120(M) Sumita 1.58401 59.5
K-SKLD100(M) Sumita 1.58773 60.4
K-CSK120(M) Sumita 1.58445 59.2
SK12 Sumita 1.58313 59.3
K-SKLD200 Sumita 1.5866 59.0
K-PSK100(M) Sumita 1.58792 60.6
K-SKLD100 Sumita 1.5911 60.7
Compare Glasses
    Compare Selected