NBFD26 by Hoya
Preferred
Very Common
Environmentally Dangerous
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) | 1.83401 |
|---|---|
| Abbe Number (Vd) | 25.97 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{3.22182 - 0.0153664\,\lambda^2 + 0.0430387\,\lambda^{-2} + 0.00301809\,\lambda^{-4} - 0.000196064\,\lambda^{-6} + 2.64463 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.33 \times 10^{-6} + 2(4.5 \times 10^{-9})\,\Delta T + 3(-2.17 \times 10^{-11})\,\Delta T^2 + \frac{1.06 \times 10^{-6} + 2(1.11 \times 10^{-9})\,\Delta T}{\lambda - 0.271}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.43 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
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 | |
|---|---|---|---|---|
| K-PSFn4(M) | Sumita | 1.83932 | 24.8 | |
| PBH56 | Ohara | 1.84139 | 24.559059 | |
| K-PSFn4 | Sumita | 1.844 | 24.8 | |
| K-PSFn185(M) | Sumita | 1.84524 | 27.1 | |
| K-PSFn3(M) | Sumita | 1.83352 | 24.0 | |
| K-PSFn3 | Sumita | 1.83917 | 23.9 | |
| K-PSFn185 | Sumita | 1.8507 | 26.9 | |
| SFLDN3 | Sumita | 1.84666 | 23.9 | |
| SFN3 | Sumita | 1.84666 | 23.9 | |
| PBH53W | Ohara | 1.846658 | 23.885544 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| MP-FDS910-50 | Hoya | 1.82165 | 24.04 | |
| MC-FDS910-50 | Hoya | 1.82165 | 24.04 | |
| M-FDS910 | Hoya | 1.82115 | 24.06 | |
| FDS90-SGP | Hoya | 1.84666 | 23.84 | |
| FDS9 | Hoya | 1.846658 | 23.826345 | |
| FDS90-SG | Hoya | 1.84666 | 23.78 | |
| FDS90 | Hoya | 1.84666 | 23.78 | |
| NBFD25 | Hoya | 1.85451 | 25.15 | |
| FD6 | Hoya | 1.805184 | 25.465194 | |
| FD60 | Hoya | 1.80518 | 25.46 |