LF5 by Sumita

Obsolete Very Rare Environmentally Dangerous

LF5 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.58144 and a Vd of 40.8. 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: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.58144
Abbe Number (Vd) 40.8
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.44487 - 0.00877157\,\lambda^2 + 0.0185443\,\lambda^{-2} + 0.000681993\,\lambda^{-4} - 2.35052 \times 10^{-5}\,\lambda^{-6} + 3.39178 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 10.0
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) 3.23
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
B81-41 Corning 1.581396 40.816116
PBL25Y Ohara 1.581439 40.768047
PBL25 Ohara 1.581439 40.753351
N-LF5 Schott 1.58144 40.848909
LF5 Schott 1.58144 40.85
S-TIL25 Ohara 1.581439 40.747566
H-QF50A CDGM 1.58144 40.746424
PBL35Y Ohara 1.581591 40.855991
QF50GTI CDGM 1.58144 40.885954
QF50 CDGM 1.58144 40.885954
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LF4 Sumita 1.57845 41.7
LF7 Sumita 1.57501 41.3
LF2 Sumita 1.58921 41.0
LF3 Sumita 1.58215 42.0
LF1 Sumita 1.57309 42.7
F8 Sumita 1.59551 39.2
LF6 Sumita 1.56732 42.8
K-BaSF5 Sumita 1.60323 42.5
BASF5 Sumita 1.60323 42.5
BASF3 Sumita 1.60717 40.2
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