H-F4 by CDGM

Preferred Very Common Environmentally Friendly

H-F4 by CDGM is a preferred optical glass with a very common melt frequency. It transmits from 0.36 to 2.40 µm with an nd of 1.62005 and a Vd of 36.345886. It has medium thermal expansion (CTE of 7.6×10⁻⁶/K), excellent chemical resistance, and low 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: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.62005
Abbe Number (Vd) 36.345886
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.131899\,\lambda^2}{\lambda^2 - 0.057932} + \frac{1.42442\,\lambda^2}{\lambda^2 - 0.010627} + \frac{1.21746\,\lambda^2}{\lambda^2 - 117.377}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.6
TCE 100/300°C (10-6/K) 9.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-5.06 \times 10^{-7} + 2(1.71 \times 10^{-8})\,\Delta T + 3(-6.38 \times 10^{-11})\,\Delta T^2 + \frac{7.53 \times 10^{-7} + 2(6.73 \times 10^{-10})\,\Delta T}{\lambda - 0.266}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.67
Relative Cost 1.3
Mechanical Properties
Young's Modulus (GPa) 83.44
Poisson's Ratio 0.229
Knoop Hardness (kgf/mm²) 607.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
F2 Schott 1.62004 36.37
F2HT Schott 1.62004 36.37
F2HTi Schott 1.62004 36.37
F2 Hoya 1.62004 36.303385
C20-36 Corning 1.62001 36.30126
E-F2 Hoya 1.62004 36.3
F2 Sumita 1.62004 36.3
PBM2Y Ohara 1.620041 36.269263
S-TIM2 Ohara 1.620041 36.263378
N-F2 Schott 1.62005 36.43
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
F4 CDGM 1.620047 36.35673
F4GTI CDGM 1.62005 36.430327
F3 CDGM 1.616592 36.627394
H-F3 CDGM 1.61659 36.651688
F5 CDGM 1.624353 35.938411
H-F5 CDGM 1.62435 35.923444
H-F6 CDGM 1.62495 35.585173
F13 CDGM 1.625884 35.713679
F6 CDGM 1.624954 35.577816
H-F13 CDGM 1.62588 35.698971
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