H-TF29 by CDGM

Preferred Rare Environmentally Friendly

H-TF29 by CDGM is a preferred optical glass with a rare melt frequency. It transmits from 0.34 to 2.40 µm with an nd of 1.77047 and a Vd of 29.806014. It has medium thermal expansion (CTE of 7.8×10⁻⁶/K), excellent chemical resistance, and very high 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: 0.340–2.400 µm
Optical Properties
Refractive Index (nd) 1.77047
Abbe Number (Vd) 29.806014
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.311396\,\lambda^2}{\lambda^2 - 0.053507} + \frac{1.70917\,\lambda^2}{\lambda^2 - 0.0119663} + \frac{2.21766\,\lambda^2}{\lambda^2 - 170.99}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.8
TCE 100/300°C (10-6/K) 10.0
Thermal Conductivity (W/mK) 0.972
Heat Capacity (J/gK) 0.643
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.75 \times 10^{-7} + 2(1.1 \times 10^{-8})\,\Delta T + 3(-3.29 \times 10^{-11})\,\Delta T^2 + \frac{9.44 \times 10^{-7} + 2(9.65 \times 10^{-10})\,\Delta T}{\lambda - 0.259}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.31
Relative Cost 27.8
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) 597.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
NBFD29 Hoya 1.77047 29.74
PBF2 Generic IR 1.766591 28.390315
LAF11A Schott 1.756927 31.702906
LAFN12 Sumita 1.7569 31.7
NBFD9 Hoya 1.756898 31.798532
S-NBH58 Ohara 1.7888 28.42865
PBH25W Ohara 1.761797 27.107726
PBH25 Ohara 1.761797 27.107724
D56-27 Corning 1.755203 27.591377
SF4 Schott 1.7552 27.58
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
ZF6 CDGM 1.755205 27.546239
H-ZF6 CDGM 1.7552 27.530047
H-ZF12 CDGM 1.76182 26.607986
ZF12 CDGM 1.761822 26.555686
ZF51 CDGM 1.784701 26.075871
H-ZF5 CDGM 1.74 28.295649
ZF5 CDGM 1.739999 28.245048
ZF13 CDGM 1.784724 25.754051
ZF50 CDGM 1.74077 27.76788
H-ZF50 CDGM 1.74077 27.760063
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