QF3 by CDGM

Obsolete Rare Environmentally Dangerous

QF3 by CDGM is an obsolete optical glass with a rare melt frequency. It transmits from 0.32 to 2.40 µm with an nd of 1.575026 and a Vd of 41.29692. It has medium thermal expansion (CTE of 9.3×10⁻⁶/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: 0.320–2.400 µm
Optical Properties
Refractive Index (nd) 1.575026
Abbe Number (Vd) 41.29692
Dispersion Formula Schott
Wavelength Range 0.365 — 0.7065 µm
$$n(\lambda) = \sqrt{2.42455 - 0.00797141\,\lambda^2 + 0.0191499\,\lambda^{-2} + 0.000355051\,\lambda^{-4} + 1.39419 \times 10^{-5}\,\lambda^{-6} + 1.70577 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.3
TCE 100/300°C (10-6/K) 11.4
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) 3.18
Relative Cost 4.0
Mechanical Properties
Young's Modulus (GPa) 56.54
Poisson's Ratio 0.206
Knoop Hardness (kgf/mm²) 410.0
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LF7 Sumita 1.57501 41.3
FL57 Hoya 1.576163 41.39334
LF7 Schott 1.575011 41.490793
PBL27 Ohara 1.575006 41.491052
S-TIL27 Ohara 1.575006 41.505207
FL7 Hoya 1.57501 41.509668
LF4 Sumita 1.57845 41.7
FL4 Hoya 1.578447 41.707529
LF5HT Schott 1.581483 40.913786
LF5HTi Schott 1.58144 40.89
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-QF3 CDGM 1.57501 41.504715
H-QF50 CDGM 1.58144 40.888972
QF50GTI CDGM 1.58144 40.885954
QF50 CDGM 1.58144 40.885954
H-QF50A CDGM 1.58144 40.746424
QF5 CDGM 1.582153 42.039634
H-QF56 CDGM 1.56732 42.810117
H-QF14 CDGM 1.59551 39.222748
H-BAF5 CDGM 1.60562 43.875621
BAF5 CDGM 1.605623 43.890292
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