LF6 by Sumita

Obsolete Very Rare Environmentally Dangerous

LF6 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 1.56732 and a Vd of 42.8. 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: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.56732
Abbe Number (Vd) 42.8
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.40479 - 0.00879884\,\lambda^2 + 0.0173707\,\lambda^{-2} + 0.000544226\,\lambda^{-4} - 1.25101 \times 10^{-5}\,\lambda^{-6} + 2.43109 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.1
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) 3.12
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-QF56 CDGM 1.56732 42.810117
S-TIL26 Ohara 1.567322 42.817076
PBL26 Ohara 1.567322 42.831708
E-FL6 Hoya 1.56732 42.84
FL6 Hoya 1.567324 42.843119
LF6HT Schott 1.56732 42.847665
PBL26Y Ohara 1.567322 42.855569
FL1 Hoya 1.573091 42.586108
PBL21 Ohara 1.573092 42.576094
IRG7 Generic IR 1.564424 43.736647
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LF1 Sumita 1.57309 42.7
LF7 Sumita 1.57501 41.3
LF4 Sumita 1.57845 41.7
LF3 Sumita 1.58215 42.0
LLF4 Sumita 1.56138 45.3
LF5 Sumita 1.58144 40.8
LF2 Sumita 1.58921 41.0
LLF7 Sumita 1.54869 45.4
LLF1 Sumita 1.54814 45.9
BAF3 Sumita 1.58267 46.5
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