TAFD40-W by Hoya
Preferred
Very Common
Environmentally Dangerous
TAFD40-W by Hoya is a preferred optical glass with a very common melt frequency. It transmits from 0.37 to 2.50 µm with an nd of 2.00069 and a Vd of 25.46. It has medium thermal expansion (CTE of 7.2×10⁻⁶/K), excellent chemical resistance, 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) | 7.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.7 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.53 \times 10^{-6} + 2(7.62 \times 10^{-9})\,\Delta T + 3(-3.12 \times 10^{-11})\,\Delta T^2 + \frac{1.08 \times 10^{-6} + 2(1.19 \times 10^{-9})\,\Delta T}{\lambda - 0.287}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Recommended glass type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-ZLAF90A | CDGM | 2.00069 | 25.458056 | |
| H-ZLAF90 | CDGM | 2.00069 | 25.425752 | |
| K-BOC30 | Sumita | 2.0068 | 26.2 | |
| CAMOO4-E | Generic Birefringent | 2.002336 | 26.628162 | |
| K-BOC20 | Sumita | 2.0054 | 27.7 | |
| S-LAH79 | Ohara | 2.0033 | 28.27328 | |
| H-ZLAF92A | CDGM | 2.0033 | 28.275906 | |
| H-ZLAF92 | CDGM | 2.0033 | 28.316305 | |
| CAMOO4 | Generic Birefringent | 1.992539 | 28.832428 | |
| S-LAH99 | Ohara | 2.001 | 29.139473 |