LF2 by Sumita

Obsolete Very Rare Environmentally Dangerous

LF2 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.32 to 2.00 µm with an nd of 1.58921 and a Vd of 41.0. It has excellent 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: 0.320–2.000 µm
Optical Properties
Refractive Index (nd) 1.58921
Abbe Number (Vd) 41.0
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.46786 - 0.00843003\,\lambda^2 + 0.0194144\,\lambda^{-2} + 0.000484939\,\lambda^{-4} + 9.38677 \times 10^{-6}\,\lambda^{-6} + 1.44741 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 10.4
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) 3.29
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
PBL22 Ohara 1.589206 41.07921
LF5G15 Schott 1.58397 40.83
PBL35Y Ohara 1.581591 40.855991
LF5HT Schott 1.581483 40.913786
LF5HTi Schott 1.58144 40.89
E-FL5 Hoya 1.58144 40.89
H-QF50 CDGM 1.58144 40.888972
QF50GTI CDGM 1.58144 40.885954
QF50 CDGM 1.58144 40.885954
FL5 Hoya 1.581437 40.887611
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LF5 Sumita 1.58144 40.8
LF3 Sumita 1.58215 42.0
LF4 Sumita 1.57845 41.7
LF7 Sumita 1.57501 41.3
F8 Sumita 1.59551 39.2
K-BaSF5 Sumita 1.60323 42.5
BASF5 Sumita 1.60323 42.5
BASF3 Sumita 1.60717 40.2
LF1 Sumita 1.57309 42.7
LF6 Sumita 1.56732 42.8
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