ZF7 by CDGM

Standard Medium Environmentally Dangerous

ZF7 by CDGM is a standard optical glass with a medium melt frequency. It transmits from 0.36 to 2.40 µm with an nd of 1.806277 and a Vd of 25.380144. It has medium thermal expansion (CTE of 7.9×10⁻⁶/K), excellent chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–1.014 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–1.014 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.806277
Abbe Number (Vd) 25.380144
Dispersion Formula Schott
Wavelength Range 0.365 — 1.014 µm
$$n(\lambda) = \sqrt{3.1222 - 0.0106498\,\lambda^2 + 0.0421919\,\lambda^{-2} + 0.00289377\,\lambda^{-4} - 0.000165236\,\lambda^{-6} + 2.32918 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.9
TCE 100/300°C (10-6/K) 9.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.19
Relative Cost 2.5
Mechanical Properties
Young's Modulus (GPa) 54.51
Poisson's Ratio 0.246
Knoop Hardness (kgf/mm²) 361.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SFL6 Schott 1.80518 25.39
K-SFLD6 Sumita 1.80518 25.4
SFLD6 Sumita 1.80518 25.4
N-SF6HT Schott 1.80518 25.36
N-SF6HTultra Schott 1.80518 25.36
N-SF6 Schott 1.80518 25.36
S-TIH6 Ohara 1.805181 25.425363
SF6 Schott 1.80518 25.43
SF6HT Schott 1.80518 25.43
TIH6 Ohara 1.805181 25.432057
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-ZF7LAGT CDGM 1.80518 25.456256
H-ZF7LA CDGM 1.80518 25.456256
ZF7LTT CDGM 1.80519 25.471232
ZF7L CDGM 1.80519 25.471232
ZF7LGT CDGM 1.80519 25.471232
H-ZF71 CDGM 1.8081 22.698087
H-ZF71GT CDGM 1.8081 22.698087
H-ZF13 CDGM 1.78472 25.720045
H-ZF13GT CDGM 1.78472 25.720045
ZF13 CDGM 1.784724 25.754051
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