K-SK5 by Sumita

Standard Rare Environmentally Friendly

K-SK5 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.28 to 2.00 µm with an nd of 1.58913 and a Vd of 61.2. It has low thermal expansion (CTE of 5.4×10⁻⁶/K) and good chemical resistance.

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: 0.280–2.000 µm
Optical Properties
Refractive Index (nd) 1.58913
Abbe Number (Vd) 61.2
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.48954 - 0.0113595\,\lambda^2 + 0.0124484\,\lambda^{-2} + 0.000557811\,\lambda^{-4} - 5.05558 \times 10^{-5}\,\lambda^{-6} + 2.86795 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.4
TCE 100/300°C (10-6/K) 6.7
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.52 \times 10^{-6} + 2(1.71 \times 10^{-8})\,\Delta T + 3(-2.45 \times 10^{-10})\,\Delta T^2 + \frac{3.45 \times 10^{-7} + 2(4.68 \times 10^{-10})\,\Delta T}{\lambda - 0.211}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.32
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAL35 Ohara 1.58913 61.182174
B89-61 Corning 1.588998 61.218914
BAL35Y Ohara 1.58913 61.233033
D-ZK3 CDGM 1.58913 61.152901
L-BAL35 Ohara 1.58913 61.152601
M-BACD5N Hoya 1.58913 61.25
MC-BACD5N Hoya 1.58913 61.25
BACD5 Hoya 1.58913 61.25
MP-BACD5N Hoya 1.58913 61.25
P-SK58A Schott 1.58913 61.15
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-SKLD5 Sumita 1.58913 61.2
SK5 Sumita 1.58913 61.2
K-SKLD5(M) Sumita 1.58606 61.0
K-SKLD100 Sumita 1.5911 60.7
K-PSK100 Sumita 1.5917 60.7
P-SK100 Sumita 1.5917 60.7
K-PSK100(M) Sumita 1.58792 60.6
P-SK50 Sumita 1.5938 61.4
K-SKLD100(M) Sumita 1.58773 60.4
P-SK60 Sumita 1.59087 62.3
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