LASFN19 by Sumita

Obsolete Very Rare Environmentally Dangerous

LASFN19 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.33 to 2.00 µm with an nd of 1.795 and a Vd of 45.2. 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: 0.330–2.000 µm
Optical Properties
Refractive Index (nd) 1.795
Abbe Number (Vd) 45.2
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.14319 - 0.014183\,\lambda^2 + 0.0263851\,\lambda^{-2} + 0.00100261\,\lambda^{-4} - 5.9284 \times 10^{-5}\,\lambda^{-6} + 4.58663 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 7.7
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) 4.57
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
S-LAH67 Ohara 1.794997 45.293967
LAH67 Ohara 1.794997 45.293967
TAF2 Hoya 1.7945 45.39
N-LAF32 Schott 1.79457 45.53
E00-46 Corning 1.800001 45.608618
M-TAF31 Hoya 1.80139 45.45
MP-TAF31-15 Hoya 1.80154 45.47
MC-TAF31-15 Hoya 1.80154 45.47
D-ZLAF50-25 CDGM 1.80225 45.452746
D-ZLAF50 CDGM 1.80337 45.491557
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-VC100(M) Sumita 1.79916 43.5
LASFN6 Sumita 1.80235 46.7
K-LaSFn6 Sumita 1.804 46.6
K-VC100 Sumita 1.804 43.6
LASFN4 Sumita 1.785 43.7
K-LaSFn4 Sumita 1.785 43.7
K-LaSFn16 Sumita 1.7883 47.4
LASFN16 Sumita 1.7883 47.4
K-LaSFn10 Sumita 1.8155 44.4
LASFN10 Sumita 1.8155 44.4
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