LLF2 by Sumita

Obsolete Very Rare Environmentally Dangerous

LLF2 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 1.54072 and a Vd of 47.2. 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: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.54072
Abbe Number (Vd) 47.2
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.33034 - 0.0088935\,\lambda^2 + 0.0148778\,\lambda^{-2} + 0.000426696\,\lambda^{-4} - 1.00884 \times 10^{-5}\,\lambda^{-6} + 1.67264 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.3
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) 2.87
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
E-FEL2 Hoya 1.54072 47.2
FEL2 Hoya 1.540718 47.198247
QF8 CDGM 1.540718 47.198243
S-TIL2 Ohara 1.54072 47.227127
LLF2 Schott 1.540719 47.171344
H-QF8 CDGM 1.54072 47.230007
PBL2 Ohara 1.54072 47.23368
QF70GFI CDGM 1.547 48.161896
LLF1HTi Schott 1.54815 45.9
QF1 CDGM 1.5481 45.886233
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LLF8 Sumita 1.53256 46.0
LLF1 Sumita 1.54814 45.9
LLF6 Sumita 1.53172 48.9
LLF7 Sumita 1.54869 45.4
BAF1 Sumita 1.5569 48.5
LLF4 Sumita 1.56138 45.3
KF2 Sumita 1.5263 51.0
KF5 Sumita 1.5231 50.9
KF4 Sumita 1.53358 51.6
KZF2 Sumita 1.52944 51.8
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