FEL7 by Hoya

Obsolete Unknown Environmentally Dangerous

FEL7 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.54883 and a Vd of 45.439785. It has dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength

No transmission data available.

Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.54883
Abbe Number (Vd) 45.439785
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{2.35282 - 0.00862098\,\lambda^2 + 0.0153062\,\lambda^{-2} + 0.000648274\,\lambda^{-4} - 4.09059 \times 10^{-5}\,\lambda^{-6} + 3.57657 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) —
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LLF7 Schott 1.548831 45.40834
LLF7 Sumita 1.54869 45.4
PBL7 Ohara 1.548689 45.555746
B48-46 Corning 1.548098 45.718533
PBL1Y Ohara 1.548141 45.733282
LLF1 Schott 1.54814 45.75
PBL1 Ohara 1.548141 45.781144
S-TIL1 Ohara 1.548141 45.784277
H-QF1 CDGM 1.54814 45.820011
N-LLF1 Schott 1.54814 45.851572
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
E-FEL1 Hoya 1.54814 45.82
FEL1 Hoya 1.548136 45.822169
FEL4 Hoya 1.561379 45.226718
FEL2 Hoya 1.540718 47.198247
E-FEL2 Hoya 1.54072 47.2
FEL3 Hoya 1.560125 47.090971
FF2 Hoya 1.532561 45.942878
FL6 Hoya 1.567324 42.843119
E-FL6 Hoya 1.56732 42.84
SBF1 Hoya 1.551151 49.517289
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