LASFN3 by Sumita

Obsolete Very Rare Environmentally Dangerous

LASFN3 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.7995 and a Vd of 42.3. It has good 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: 0.340–2.000 µm
Optical Properties
Refractive Index (nd) 1.7995
Abbe Number (Vd) 42.3
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.15004 - 0.0118823\,\lambda^2 + 0.0300911\,\lambda^{-2} + 0.000538379\,\lambda^{-4} + 1.98434 \times 10^{-5}\,\lambda^{-6} + 1.47171 \times 10^{-6}\,\lambda^{-8}}$$
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) 4.35
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
NBFD12 Hoya 1.7995 42.34
H-LAF54 CDGM 1.799519 42.253294
LAH52 Ohara 1.799516 42.241337
S-LAH52Q Ohara 1.79952 42.239506
N-LAF36 Schott 1.79952 42.37
S-LAH52 Ohara 1.799516 42.225007
D96-43 Corning 1.796195 43.217783
NBFD2 Hoya 1.797199 41.143795
NBFD1 Hoya 1.789004 42.757634
H-ZLAF52A CDGM 1.8061 41.016887
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaSFn3 Sumita 1.7995 42.3
K-VC179 Sumita 1.7989 41.8
K-VC179(M) Sumita 1.79441 41.9
K-VC100(M) Sumita 1.79916 43.5
K-VC100 Sumita 1.804 43.6
K-VC181(M) Sumita 1.80614 41.1
K-VC89(M) Sumita 1.8059 40.9
LASFN1 Sumita 1.806 40.7
K-LaSFn1 Sumita 1.8061 40.7
K-VC181 Sumita 1.81055 41.1
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