LLF1 by Sumita

Obsolete Very Rare Environmentally Dangerous

LLF1 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 1.54814 and a Vd of 45.9. 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) 1.54814
Abbe Number (Vd) 45.9
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.34949 - 0.00790271\,\lambda^2 + 0.0164976\,\lambda^{-2} + 0.000181082\,\lambda^{-4} + 2.78888 \times 10^{-5}\,\lambda^{-6} - 9.93141 \times 10^{-8}\,\lambda^{-8}}$$
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) 2.93
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
LLF1HTi Schott 1.54815 45.9
LLF1HT Schott 1.548144 45.888593
QF1 CDGM 1.5481 45.886233
N-LLF1 Schott 1.54814 45.851572
FEL1 Hoya 1.548136 45.822169
H-QF1 CDGM 1.54814 45.820011
E-FEL1 Hoya 1.54814 45.82
S-TIL1 Ohara 1.548141 45.784277
PBL1 Ohara 1.548141 45.781144
LLF1 Schott 1.54814 45.75
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LLF7 Sumita 1.54869 45.4
LLF2 Sumita 1.54072 47.2
LLF4 Sumita 1.56138 45.3
LLF8 Sumita 1.53256 46.0
BAF1 Sumita 1.5569 48.5
LLF6 Sumita 1.53172 48.9
LF6 Sumita 1.56732 42.8
LF1 Sumita 1.57309 42.7
BAF3 Sumita 1.58267 46.5
LF7 Sumita 1.57501 41.3
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