LAK18 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAK18 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.29 to 2.00 µm with an nd of 1.72916 and a Vd of 54.7. 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: 0.290–2.000 µm
Optical Properties
Refractive Index (nd) 1.72916
Abbe Number (Vd) 54.7
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.93265 - 0.014636\,\lambda^2 + 0.0207833\,\lambda^{-2} + 0.000221712\,\lambda^{-4} + 1.54042 \times 10^{-5}\,\lambda^{-6} - 3.06689 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 7.1
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
H-LAK52 CDGM 1.72916 54.684737
LAL18 Ohara 1.729157 54.683134
S-LAL18 Ohara 1.729157 54.680013
TAC8 Hoya 1.72916 54.67
TAC8P Hoya 1.72916 54.54
N-LAK34 Schott 1.72916 54.5
S-LAL19 Ohara 1.72916 54.095223
MP-TAC80-60 Hoya 1.72963 54.07
M-TAC80 Hoya 1.72903 54.04
D-LAK52 CDGM 1.7305 53.944268
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaK18 Sumita 1.72916 54.7
K-LaK8 Sumita 1.713 53.9
LAK8 Sumita 1.713 53.9
LAKN14 Sumita 1.741 52.7
K-LaKn14 Sumita 1.741 52.7
LAKN12 Sumita 1.7335 51.2
LASKN1 Sumita 1.755 52.4
K-LaSKn1 Sumita 1.755 52.4
LAK14 Sumita 1.6968 55.6
K-LaK14 Sumita 1.6968 55.6
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