H-QF56 by CDGM

Standard Rare Environmentally Friendly

H-QF56 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.35 to 2.40 µm with an nd of 1.56732 and a Vd of 42.810117. It has medium thermal expansion (CTE of 9.4×10⁻⁶/K), excellent chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.350–2.400 µm
Optical Properties
Refractive Index (nd) 1.56732
Abbe Number (Vd) 42.810117
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.01194\,\lambda^2}{\lambda^2 - 116.639} + \frac{0.110712\,\lambda^2}{\lambda^2 - 0.0511037} + \frac{1.29397\,\lambda^2}{\lambda^2 - 0.0092374}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.4
TCE 100/300°C (10-6/K) 11.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.86 \times 10^{-6} + 2(1.38 \times 10^{-8})\,\Delta T + 3(-3.64 \times 10^{-11})\,\Delta T^2 + \frac{7.51 \times 10^{-7} + 2(4.38 \times 10^{-11})\,\Delta T}{\lambda - 0.236}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.62
Relative Cost 4.3
Mechanical Properties
Young's Modulus (GPa) 73.75
Poisson's Ratio 0.235
Knoop Hardness (kgf/mm²) 502.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-TIL26 Ohara 1.567322 42.817076
LF6 Sumita 1.56732 42.8
PBL26 Ohara 1.567322 42.831708
E-FL6 Hoya 1.56732 42.84
FL6 Hoya 1.567324 42.843119
LF6HT Schott 1.56732 42.847665
PBL26Y Ohara 1.567322 42.855569
LF1 Sumita 1.57309 42.7
FL1 Hoya 1.573091 42.586108
PBL21 Ohara 1.573092 42.576094
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-QF3 CDGM 1.57501 41.504715
QF3 CDGM 1.575026 41.29692
QF5 CDGM 1.582153 42.039634
H-QF50 CDGM 1.58144 40.888972
QF50 CDGM 1.58144 40.885954
QF50GTI CDGM 1.58144 40.885954
H-QF50A CDGM 1.58144 40.746424
H-QF1 CDGM 1.54814 45.820011
QF1 CDGM 1.5481 45.886233
BAF4 CDGM 1.582712 46.505886
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