LAFN4 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAFN4 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 1.72 and a Vd of 43.7. 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: 0.350–2.000 µm
Optical Properties
Refractive Index (nd) 1.72
Abbe Number (Vd) 43.7
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.88557 - 0.0102797\,\lambda^2 + 0.0247924\,\lambda^{-2} + 0.000493143\,\lambda^{-4} + 1.13915 \times 10^{-5}\,\lambda^{-6} + 1.95598 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.0
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) 4.12
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
LAM52 Ohara 1.72 43.705625
S-LAM52 Ohara 1.72 43.689812
H-LAF62 CDGM 1.72 43.680739
LAFL5 Hoya 1.719998 43.903303
LAFL4 Hoya 1.712704 43.295113
LAFL6 Hoya 1.72 42.016239
LAM58 Ohara 1.72 41.989859
S-LAM58 Ohara 1.72 41.978463
S-LAM61 Ohara 1.720002 46.024571
LAM61 Ohara 1.720002 46.035166
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LAFN10 Sumita 1.72016 42.1
K-LaFn11 Sumita 1.72013 46.0
LAFN11 Sumita 1.72013 46.0
LAF2 Sumita 1.744 44.9
K-LaF2 Sumita 1.744 44.9
BASF7 Sumita 1.70154 41.1
K-VC174(M) Sumita 1.74578 45.1
K-VC174 Sumita 1.7485 45.3
LAF3 Sumita 1.717 47.9
K-GIR140 Sumita 1.75106 43.1
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