K-VC181 by Sumita

Preferred Common Precision Molding Environmentally Friendly

K-VC181 by Sumita is a preferred optical glass with a common melt frequency. It transmits from 0.33 to 2.00 µm with an nd of 1.81055 and a Vd of 41.1. It has low thermal expansion (CTE of 5.7×10⁻⁶/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: 0.330–2.000 µm
Optical Properties
Refractive Index (nd) 1.81055
Abbe Number (Vd) 41.1
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{3.18869 - 0.0138205\,\lambda^2 + 0.0296316\,\lambda^{-2} + 0.00106595\,\lambda^{-4} - 3.77951 \times 10^{-5}\,\lambda^{-6} + 4.39666 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.7
TCE 100/300°C (10-6/K) 7.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.99 \times 10^{-6} + 2(2.24 \times 10^{-8})\,\Delta T + 3(-2.94 \times 10^{-10})\,\Delta T^2 + \frac{8.37 \times 10^{-7} + 2(3.41 \times 10^{-10})\,\Delta T}{\lambda - 0.213}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.71
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
D-ZLAF52LA CDGM 1.81 40.992863
P-LASF51 Schott 1.81 40.93
D-ZLAF81 CDGM 1.8088 40.999441
D-ZLAF52LA-25 CDGM 1.80882 40.970313
MC-NBFD135 Hoya 1.80834 40.92
D-ZLAF81-25 CDGM 1.80757 40.97334
LASF3 Schott 1.808009 40.610164
H-ZLAF52A CDGM 1.8061 41.016887
L-LAH53 Ohara 1.806249 40.907302
LAH53 Ohara 1.806098 40.948508
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-VC89 Sumita 1.81 41.0
K-VC181(M) Sumita 1.80614 41.1
K-VC89(M) Sumita 1.8059 40.9
K-LaSFn1 Sumita 1.8061 40.7
LASFN1 Sumita 1.806 40.7
K-LaSFn2 Sumita 1.805 39.6
LASFN2 Sumita 1.805 39.6
K-VC179 Sumita 1.7989 41.8
K-LaSFn3 Sumita 1.7995 42.3
LASFN3 Sumita 1.7995 42.3
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