LAFN9 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAFN9 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.35 to 2.00 µm with an nd of 1.764 and a Vd of 40.3. 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: 0.350–2.000 µm
Optical Properties
Refractive Index (nd) 1.764
Abbe Number (Vd) 40.3
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.03287 - 0.0138693\,\lambda^2 + 0.0235549\,\lambda^{-2} + 0.00242261\,\lambda^{-4} - 0.000255768\,\lambda^{-6} + 1.79122 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.8
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) 4.26
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
NBFD5 Hoya 1.762001 40.263213
H-LAF55 CDGM 1.762 40.105472
LAM55 Ohara 1.762001 40.100947
S-LAM55 Ohara 1.762001 40.100176
LAF13 Schott 1.775507 37.836043
H-LAFL5 CDGM 1.75367 37.491665
LAF22A Schott 1.781791 37.196288
H-LAF7 CDGM 1.78179 37.092107
NBFD6 Hoya 1.756702 36.345258
LAFN8 Schott 1.735197 41.590899
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-GIR140 Sumita 1.75106 43.1
K-VC179(M) Sumita 1.79441 41.9
K-LaSFn4 Sumita 1.785 43.7
LASFN4 Sumita 1.785 43.7
K-VC179 Sumita 1.7989 41.8
LASFN3 Sumita 1.7995 42.3
K-LaSFn3 Sumita 1.7995 42.3
LAF2 Sumita 1.744 44.9
K-LaF2 Sumita 1.744 44.9
K-VC174(M) Sumita 1.74578 45.1
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