LLF6 by Schott

Obsolete Unknown Environmentally Dangerous

LLF6 by Schott is an obsolete optical glass. It transmits from 0.31 to 2.33 µm with an nd of 1.531719 and a Vd of 48.762595. It has medium thermal expansion (CTE of 7.5×10⁻⁶/K), excellent chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.31–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.31–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.325 µm
Optical Properties
Refractive Index (nd) 1.531719
Abbe Number (Vd) 48.762595
Dispersion Formula Sellmeier
Wavelength Range 0.31 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.20067\,\lambda^2}{\lambda^2 - 0.00851611} + \frac{0.103689\,\lambda^2}{\lambda^2 - 0.0418805} + \frac{0.954739\,\lambda^2}{\lambda^2 - 114.99}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.5
TCE 100/300°C (10-6/K) 8.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.54 \times 10^{-6} + 2(1.84 \times 10^{-8})\,\Delta T + 3(-3.65 \times 10^{-11})\,\Delta T^2 + \frac{5.59 \times 10^{-7} + 2(4.53 \times 10^{-10})\,\Delta T}{\lambda - 0.25}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.81
Relative Cost 2.03
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
QF6 CDGM 1.531719 48.755584
FEL6 Hoya 1.53172 48.837531
H-QF6A CDGM 1.53172 48.839833
E-FEL6 Hoya 1.53172 48.84
S-TIL6 Ohara 1.531717 48.840718
LLF6 Sumita 1.53172 48.9
PBL6 Ohara 1.531717 48.904553
PBL6Y Ohara 1.531717 48.956017
PBL2 Ohara 1.54072 47.23368
H-QF8 CDGM 1.54072 47.230007
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-LLF6 Schott 1.531688 48.895238
LLF6HT Schott 1.531739 48.974492
LLF2 Schott 1.540719 47.171344
KZFN1 Schott 1.551149 49.637723
KZFN2 Schott 1.52944 51.626811
KF9 Schott 1.523412 51.492996
N-KF9 Schott 1.52346 51.54
LLF1HTi Schott 1.54815 45.9
LLF1HT Schott 1.548144 45.888593
N-LLF1 Schott 1.54814 45.851572
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