F2 by CDGM
Obsolete
Rare
Environmentally Dangerous
F2 by CDGM is an obsolete optical glass with a rare melt frequency. It transmits from 0.32 to 2.40 µm with an nd of 1.612929 and a Vd of 36.986002. It has medium thermal expansion (CTE of 10.1×10⁻⁶/K), excellent chemical resistance, low 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
| Refractive Index (nd) | 1.612929 |
|---|---|
| Abbe Number (Vd) | 36.986002 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.365 — 1.014 µm |
$$n(\lambda) = \sqrt{2.53266 - 0.00773825\,\lambda^2 + 0.0231731\,\lambda^{-2} + 0.000409363\,\lambda^{-4} + 3.78047 \times 10^{-5}\,\lambda^{-6} + 1.03464 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 10.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 12.1 |
| Thermal Conductivity (W/mK) | 0.645 |
| Heat Capacity (J/gK) | 0.473 |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.84 \times 10^{-6} + 2(1.63 \times 10^{-8})\,\Delta T + 3(-7.71 \times 10^{-11})\,\Delta T^2 + \frac{9.44 \times 10^{-7} + 2(8.73 \times 10^{-10})\,\Delta T}{\lambda - 0.251}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Mechanical Properties
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| PBM3 | Ohara | 1.612929 | 36.994096 | |
| S-TIM3 | Ohara | 1.612929 | 37.005342 | |
| F3 | Hoya | 1.612929 | 36.964515 | |
| E-F3 | Hoya | 1.61293 | 36.96 | |
| F3 | Schott | 1.612931 | 37.038954 | |
| F3 | Sumita | 1.61293 | 36.9 | |
| PBM4 | Ohara | 1.616588 | 36.632973 | |
| F4 | Schott | 1.616592 | 36.628072 | |
| F4 | Hoya | 1.616589 | 36.615561 | |
| F4 | Sumita | 1.61659 | 36.6 |
Similar Glasses (CDGM)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-F2 | CDGM | 1.61293 | 37.004441 | |
| H-F3 | CDGM | 1.61659 | 36.651688 | |
| F3 | CDGM | 1.616592 | 36.627394 | |
| F4GTI | CDGM | 1.62005 | 36.430327 | |
| F4 | CDGM | 1.620047 | 36.35673 | |
| H-F4 | CDGM | 1.62005 | 36.345886 | |
| H-F1 | CDGM | 1.60342 | 38.010877 | |
| F1 | CDGM | 1.603417 | 38.01487 | |
| F5 | CDGM | 1.624353 | 35.938411 | |
| H-F5 | CDGM | 1.62435 | 35.923444 |