QF6 by CDGM

Obsolete Rare Environmentally Dangerous

QF6 by CDGM is an obsolete optical glass with a rare melt frequency. It transmits from 0.31 to 2.40 µm with an nd of 1.531719 and a Vd of 48.755584. It has medium thermal expansion (CTE of 8.2×10⁻⁶/K), moderate relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–0.7065 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–0.7065 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.400 µm
Optical Properties
Refractive Index (nd) 1.531719
Abbe Number (Vd) 48.755584
Dispersion Formula Schott
Wavelength Range 0.365 — 0.7065 µm
$$n(\lambda) = \sqrt{2.30449 - 0.00837823\,\lambda^2 + 0.0144243\,\lambda^{-2} + 0.000333743\,\lambda^{-4} - 4.46575 \times 10^{-6}\,\lambda^{-6} + 1.33499 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 9.8
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) 2.78
Relative Cost 4.6
Mechanical Properties
Young's Modulus (GPa) 62.37
Poisson's Ratio 0.21
Knoop Hardness (kgf/mm²) 400.0
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LLF6 Schott 1.531719 48.762595
FEL6 Hoya 1.53172 48.837531
E-FEL6 Hoya 1.53172 48.84
S-TIL6 Ohara 1.531717 48.840718
N-LLF6 Schott 1.531688 48.895238
LLF6 Sumita 1.53172 48.9
PBL6 Ohara 1.531717 48.904553
PBL6Y Ohara 1.531717 48.956017
LLF6HT Schott 1.531739 48.974492
PBL2 Ohara 1.54072 47.23368
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-QF6A CDGM 1.53172 48.839833
H-QF8 CDGM 1.54072 47.230007
QF8 CDGM 1.540718 47.198243
QF70GFI CDGM 1.547 48.161896
QF1 CDGM 1.5481 45.886233
H-QF1 CDGM 1.54814 45.820011
H-KF6 CDGM 1.51742 52.149249
BAF2 CDGM 1.569703 49.435926
H-BAF2 CDGM 1.5697 49.452646
H-K12 CDGM 1.533589 55.469983
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