ZF8 by CDGM

Obsolete Rare Environmentally Dangerous

ZF8 by CDGM is an obsolete optical glass with a rare melt frequency. It transmits from 0.33 to 2.40 µm with an nd of 1.65446 and a Vd of 33.651201. It has medium thermal expansion (CTE of 7.6×10⁻⁶/K), excellent chemical resistance, moderate relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–0.7065 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–0.7065 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.330–2.400 µm
Optical Properties
Refractive Index (nd) 1.65446
Abbe Number (Vd) 33.651201
Dispersion Formula Schott
Wavelength Range 0.365 — 0.7065 µm
$$n(\lambda) = \sqrt{2.65672 - 0.0091117\,\lambda^2 + 0.0258152\,\lambda^{-2} + 0.00112036\,\lambda^{-4} - 4.10668 \times 10^{-5}\,\lambda^{-6} + 6.9242 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.6
TCE 100/300°C (10-6/K) 8.9
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) 3.91
Relative Cost 6.0
Mechanical Properties
Young's Modulus (GPa) 56.62
Poisson's Ratio 0.224
Knoop Hardness (kgf/mm²) 379.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SF9 Schott 1.654461 33.651384
FD9 Hoya 1.654462 33.717017
SF9 Sumita 1.65446 33.8
FD12 Hoya 1.648308 33.793909
SF12 Sumita 1.64831 33.8
SF12 Schott 1.64831 33.841187
C48-34 Corning 1.647992 33.943274
S-TIM22 Ohara 1.647689 33.792803
PBM22 Ohara 1.647689 33.802937
N-SF2 Schott 1.64769 33.82
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
ZF1 CDGM 1.647693 33.836872
H-ZF1 CDGM 1.64769 33.840317
H-ZF1A CDGM 1.64769 33.887993
H-ZF39 CDGM 1.6668 33.053728
H-F51 CDGM 1.6398 34.46457
H-ZBAF4 CDGM 1.66426 35.484251
ZF2 CDGM 1.672707 32.180986
H-ZF2 CDGM 1.6727 32.171186
F7 CDGM 1.636365 35.386204
H-F13 CDGM 1.62588 35.698971
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