LAK10 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAK10 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.72 and a Vd of 50.3. It has average chemical resistance and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.72
Abbe Number (Vd) 50.3
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.89326 - 0.0102862\,\lambda^2 + 0.0235024\,\lambda^{-2} - 0.000130486\,\lambda^{-4} + 8.2469 \times 10^{-5}\,\lambda^{-6} - 3.97648 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.08
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
D20-50 Corning 1.720003 50.312121
H-LAK8B CDGM 1.72 50.280736
H-LAK8A CDGM 1.72 50.343857
LAL10 Ohara 1.719995 50.254429
LAC10 Hoya 1.72 50.35
S-LAL10 Ohara 1.719995 50.230564
LAK10 Schott 1.72 50.41004
N-LAK10 Schott 1.72003 50.62
H-LAK72 CDGM 1.713 51.80665
TAC4 Hoya 1.734 51.05
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaK10 Sumita 1.72 50.3
LAKN12 Sumita 1.7335 51.2
LAFN7 Sumita 1.735 49.5
LAF3 Sumita 1.717 47.9
LAFN5 Sumita 1.743 49.2
K-LaFn5 Sumita 1.743 49.2
LAFN3 Sumita 1.7 48.0
K-LaFn3 Sumita 1.7 48.0
LAFN2 Sumita 1.697 48.5
K-LaK8 Sumita 1.713 53.9
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