K-VC82(M) by Sumita

Preferred Common Environmentally Friendly

K-VC82(M) by Sumita is a preferred optical glass with a common melt frequency. It transmits from 0.32 to 2.00 µm with an nd of 1.75028 and a Vd of 45.4. It has low thermal expansion (CTE of 5.9×10⁻⁶/K) and 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: 0.320–2.000 µm
Optical Properties
Refractive Index (nd) 1.75028
Abbe Number (Vd) 45.4
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.99149 - 0.0143671\,\lambda^2 + 0.0246506\,\lambda^{-2} + 0.00071568\,\lambda^{-4} - 2.7939 \times 10^{-5}\,\lambda^{-6} + 3.2294 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.9
TCE 100/300°C (10-6/K) 8.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.27 \times 10^{-6} + 2(1.73 \times 10^{-8})\,\Delta T + 3(-7.19 \times 10^{-11})\,\Delta T^2 + \frac{6.68 \times 10^{-7} + 2(9.93 \times 10^{-10})\,\Delta T}{\lambda - 0.203}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.25
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
P-LAF37 Schott 1.7555 45.66
H-LAF3B CDGM 1.744 44.900027
LAF2 Hoya 1.744 44.9
LAF20 Hoya 1.744 44.872914
N-LAF2 Schott 1.74397 44.85
D44-45 Corning 1.744001 44.818533
LAM2 Ohara 1.743997 44.787528
S-LAM2 Ohara 1.743997 44.786431
LAF2 Schott 1.744002 44.719972
H-LAF6LA CDGM 1.757 47.711817
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-VC174 Sumita 1.7485 45.3
K-VC174(M) Sumita 1.74578 45.1
VC81 Sumita 1.75512 45.6
K-VC82 Sumita 1.7555 45.6
LAF2 Sumita 1.744 44.9
K-LaF2 Sumita 1.744 44.9
K-GIR140 Sumita 1.75106 43.1
LAFN8 Sumita 1.756 47.6
K-LaFn5 Sumita 1.743 49.2
LAFN5 Sumita 1.743 49.2
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