K-SK14 by Sumita

Standard Rare Environmentally Friendly

K-SK14 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 1.60311 and a Vd of 60.7. It has low thermal expansion (CTE of 5.7×10⁻⁶/K) and below average 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) 1.60311
Abbe Number (Vd) 60.7
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.53139 - 0.0109563\,\lambda^2 + 0.0138035\,\lambda^{-2} + 0.000298039\,\lambda^{-4} - 6.2452 \times 10^{-6}\,\lambda^{-6} + 2.5686 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.7
TCE 100/300°C (10-6/K) 7.3
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.63 \times 10^{-7} + 2(2.16 \times 10^{-8})\,\Delta T + 3(-8.94 \times 10^{-11})\,\Delta T^2 + \frac{4.28 \times 10^{-7} + 2(2.18 \times 10^{-10})\,\Delta T}{\lambda - 0.16}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.44
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 3
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BACD14 Hoya 1.60311 60.7
BSM14 Ohara 1.603112 60.704896
BSM51Y Ohara 1.603109 60.651225
S-BSM14 Ohara 1.603112 60.64108
H-ZK14 CDGM 1.60311 60.603787
N-SK14 Schott 1.60311 60.6
SK14 Schott 1.60311 60.596819
FCD600 Hoya 1.5941 60.47
BACD7 Hoya 1.607292 59.474776
H-ZK7 CDGM 1.613095 60.614383
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SK14 Sumita 1.60311 60.7
SK7 Sumita 1.60729 59.5
K-SK7 Sumita 1.60729 59.5
P-SK50 Sumita 1.5938 61.4
P-SK100 Sumita 1.5917 60.7
K-PSK100 Sumita 1.5917 60.7
K-SKLD100 Sumita 1.5911 60.7
SK3 Sumita 1.60881 58.9
K-SK5 Sumita 1.58913 61.2
SK5 Sumita 1.58913 61.2
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