FD270 by Hoya
Preferred
Very Common
Environmentally Dangerous
FD270 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 1.6843 and a Vd of 26.81. It has high thermal expansion (CTE of 12.1×10⁻⁶/K), average 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) | 12.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 15.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.32 \times 10^{-5} + 2(2.34 \times 10^{-9})\,\Delta T + 3(-6.1 \times 10^{-11})\,\Delta T^2 + \frac{1.25 \times 10^{-6} + 2(1.54 \times 10^{-9})\,\Delta T}{\lambda - 0.282}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | 2 |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Recommended glass type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| K-CD300 | Sumita | 1.6922 | 29.6 | |
| K-CD300(M) | Sumita | 1.68558 | 29.9 | |
| SF15 | Sumita | 1.69895 | 30.0 | |
| H-ZF11 | CDGM | 1.69894 | 30.05045 | |
| ZF11 | CDGM | 1.698949 | 30.065686 | |
| SF15 | Schott | 1.69895 | 30.07 | |
| C99-30 | Corning | 1.699002 | 30.107427 | |
| PBM35 | Ohara | 1.698947 | 30.121211 | |
| S-TIM35 | Ohara | 1.698947 | 30.127865 | |
| N-SF15 | Schott | 1.69892 | 30.2 |