H-ZF88GT by CDGM

Preferred Very Common Environmentally Friendly

H-ZF88GT by CDGM is a preferred optical glass with a very common melt frequency. It transmits from 0.39 to 2.40 µm with an nd of 1.94595 and a Vd of 17.941964. It has low thermal expansion (CTE of 6.0×10⁻⁶/K), excellent chemical resistance, and high relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.4047–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.4047–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.390–2.400 µm
Optical Properties
Refractive Index (nd) 1.94595
Abbe Number (Vd) 17.941964
Dispersion Formula Sellmeier
Wavelength Range 0.4047 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{2.04275\,\lambda^2}{\lambda^2 - 0.0169743} + \frac{1.98276\,\lambda^2}{\lambda^2 - 109.068} + \frac{0.504268\,\lambda^2}{\lambda^2 - 0.0751711}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.0
TCE 100/300°C (10-6/K) 7.3
Thermal Conductivity (W/mK) 0.887
Heat Capacity (J/gK) 0.577
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.58 \times 10^{-6} + 2(1.75 \times 10^{-8})\,\Delta T + 3(-4.67 \times 10^{-11})\,\Delta T^2 + \frac{1.18 \times 10^{-6} + 2(1.91 \times 10^{-9})\,\Delta T}{\lambda - 0.33}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.52
Relative Cost 15.9
Mechanical Properties
Young's Modulus (GPa) 108.81
Poisson's Ratio 0.243
Knoop Hardness (kgf/mm²) 520.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
FDS18-W Hoya 1.94595 17.98
FDS18 Hoya 1.94595 17.98
S-NPH3 Ohara 1.95906 17.471252
SF59 Schott 1.952497 20.363706
S-NPH2 Ohara 1.92286 18.896912
M-FDS1 Hoya 1.92286 20.88
SF66 Schott 1.92286 20.88
N-SF66 Schott 1.92286 20.88
E-FDS1-W Hoya 1.92286 20.88
MP-FDS1 Hoya 1.92286 20.88
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-ZF88 CDGM 1.94595 17.941964
H-ZF73 CDGM 1.95906 17.472434
H-ZF73GT CDGM 1.95906 17.472434
H-ZF72A CDGM 1.92286 18.895887
H-ZF72AGT CDGM 1.92286 18.895887
H-ZF62 CDGM 1.92286 20.879915
H-ZF62GT CDGM 1.92286 20.879915
D-ZF93-25 CDGM 1.9998 20.686444
D-ZF93 CDGM 2.0017 20.700195
H-ZLAF90 CDGM 2.00069 25.425752
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