LF5 by Schott

Preferred Unknown Environmentally Dangerous

LF5 by Schott is a preferred optical glass. It transmits from 0.32 to 2.33 µm with an nd of 1.58144 and a Vd of 40.85. It has medium thermal expansion (CTE of 9.1×10⁻⁶/K), good chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.32–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.32–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–2.325 µm
Optical Properties
Refractive Index (nd) 1.58144
Abbe Number (Vd) 40.85
Dispersion Formula Sellmeier
Wavelength Range 0.32 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.28036\,\lambda^2}{\lambda^2 - 0.00929854} + \frac{0.163506\,\lambda^2}{\lambda^2 - 0.0449136} + \frac{0.89393\,\lambda^2}{\lambda^2 - 110.494}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.1
TCE 100/300°C (10-6/K) 10.6
Thermal Conductivity (W/mK) 0.87
Heat Capacity (J/gK) 0.657
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.27 \times 10^{-6} + 2(9.71 \times 10^{-9})\,\Delta T + 3(-2.83 \times 10^{-11})\,\Delta T^2 + \frac{8.36 \times 10^{-7} + 2(9.95 \times 10^{-10})\,\Delta T}{\lambda - 0.228}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.22
Relative Cost 2.1
Mechanical Properties
Young's Modulus (GPa) 59.0
Poisson's Ratio 0.22
Knoop Hardness (kgf/mm²) 450.0
Chemical Resistance
Climatic Resistance 2
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 2
Phosphate Resistance 2
Notes

lead containing glass type

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
PBL35Y Ohara 1.581591 40.855991
B81-41 Corning 1.581396 40.816116
QF50 CDGM 1.58144 40.885954
QF50GTI CDGM 1.58144 40.885954
FL5 Hoya 1.581437 40.887611
H-QF50 CDGM 1.58144 40.888972
E-FL5 Hoya 1.58144 40.89
LF5 Sumita 1.58144 40.8
PBL25Y Ohara 1.581439 40.768047
PBL25 Ohara 1.581439 40.753351
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-LF5 Schott 1.58144 40.848909
LF5HTi Schott 1.58144 40.89
LF5HT Schott 1.581483 40.913786
LF5G15 Schott 1.58397 40.83
LF7 Schott 1.575011 41.490793
LF5G19 Schott 1.59655 39.89
F8HT Schott 1.59551 39.179444
F8 Schott 1.59551 39.179444
LF6HT Schott 1.56732 42.847665
LF8 Schott 1.564435 43.75028
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