H-ZF7LA by CDGM

Preferred Very Common Environmentally Friendly

H-ZF7LA 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 1.80518 and a Vd of 25.456256. It has medium thermal expansion (CTE of 9.0×10⁻⁶/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: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.80518
Abbe Number (Vd) 25.456256
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.65846\,\lambda^2}{\lambda^2 - 144.875} + \frac{0.298796\,\lambda^2}{\lambda^2 - 0.0635425} + \frac{1.81848\,\lambda^2}{\lambda^2 - 0.0141908}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.0
TCE 100/300°C (10-6/K) 11.3
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-7.91 \times 10^{-6} + 2(1.24 \times 10^{-8})\,\Delta T + 3(-3.12 \times 10^{-11})\,\Delta T^2 + \frac{1.09 \times 10^{-6} + 2(1.48 \times 10^{-9})\,\Delta T}{\lambda - 0.281}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.35
Relative Cost 4.6
Mechanical Properties
Young's Modulus (GPa) 89.94
Poisson's Ratio 0.265
Knoop Hardness (kgf/mm²) 513.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
FD60-W Hoya 1.80518 25.46
FD60 Hoya 1.80518 25.46
FD6 Hoya 1.805184 25.465194
PBH6W Ohara 1.805177 25.435012
PBH6 Ohara 1.805177 25.435012
TIH6 Ohara 1.805181 25.432057
SF6 Schott 1.80518 25.43
SF6HT Schott 1.80518 25.43
S-TIH6 Ohara 1.805181 25.425363
SF6W Sumita 1.80518 25.5
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-ZF7LAGT CDGM 1.80518 25.456256
ZF7L CDGM 1.80519 25.471232
ZF7LGT CDGM 1.80519 25.471232
ZF7LTT CDGM 1.80519 25.471232
ZF7 CDGM 1.806277 25.380144
H-ZF71GT CDGM 1.8081 22.698087
H-ZF71 CDGM 1.8081 22.698087
H-ZF13GT CDGM 1.78472 25.720045
H-ZF13 CDGM 1.78472 25.720045
ZF13 CDGM 1.784724 25.754051
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