F4GTI by CDGM
Standard
Rare
Environmentally Dangerous
F4GTI by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.32 to 2.40 µm with an nd of 1.62005 and a Vd of 36.430327. It has medium thermal expansion (CTE of 9.1×10⁻⁶/K), excellent chemical resistance, very high relative cost, and dangerous environmental properties.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
Thermal Properties
| TCE -30/70°C (10-6/K) | 9.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 11.4 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.48 \times 10^{-6} + 2(1.78 \times 10^{-8})\,\Delta T + 3(-4.98 \times 10^{-11})\,\Delta T^2 + \frac{9.69 \times 10^{-7} + 2(4.88 \times 10^{-10})\,\Delta T}{\lambda - 0.243}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Mechanical Properties
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
i line glass
Similar Glasses (Other Manufacturers)
Similar Glasses (CDGM)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| F4 | CDGM | 1.620047 | 36.35673 | |
| H-F4 | CDGM | 1.62005 | 36.345886 | |
| F3 | CDGM | 1.616592 | 36.627394 | |
| H-F3 | CDGM | 1.61659 | 36.651688 | |
| F5 | CDGM | 1.624353 | 35.938411 | |
| H-F5 | CDGM | 1.62435 | 35.923444 | |
| F13 | CDGM | 1.625884 | 35.713679 | |
| H-F6 | CDGM | 1.62495 | 35.585173 | |
| H-F13 | CDGM | 1.62588 | 35.698971 | |
| F6 | CDGM | 1.624954 | 35.577816 |