NBFD12 by Hoya
Special
Very Rare
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) | 1.7995 |
|---|---|
| Abbe Number (Vd) | 42.34 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{3.15137 - 0.013052\,\lambda^2 + 0.0295021\,\lambda^{-2} + 0.000676434\,\lambda^{-4} + 3.66797 \times 10^{-6}\,\lambda^{-6} + 1.82333 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.7 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.05628 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.45 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 3 |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Not in a position to accept new order because of discontinuation.
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| N-LAF36 | Schott | 1.79952 | 42.37 | |
| LASFN3 | Sumita | 1.7995 | 42.3 | |
| K-LaSFn3 | Sumita | 1.7995 | 42.3 | |
| H-LAF54 | CDGM | 1.799519 | 42.253294 | |
| LAH52 | Ohara | 1.799516 | 42.241337 | |
| S-LAH52Q | Ohara | 1.79952 | 42.239506 | |
| S-LAH52 | Ohara | 1.799516 | 42.225007 | |
| K-VC179 | Sumita | 1.7989 | 41.8 | |
| K-VC179(M) | Sumita | 1.79441 | 41.9 | |
| D96-43 | Corning | 1.796195 | 43.217783 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| NBFD2 | Hoya | 1.797199 | 41.143795 | |
| NBFD1 | Hoya | 1.789004 | 42.757634 | |
| M-NBFD13 | Hoya | 1.8061 | 40.740652 | |
| MP-NBFD130 | Hoya | 1.8061 | 40.73 | |
| M-NBFD130 | Hoya | 1.8061 | 40.73 | |
| MC-NBFD130 | Hoya | 1.8061 | 40.73 | |
| MC-NBFD130L | Hoya | 1.8061 | 40.73 | |
| NBFD13 | Hoya | 1.8061 | 40.73 | |
| MC-NBFD135 | Hoya | 1.80834 | 40.92 | |
| NBFD14 | Hoya | 1.801699 | 44.321602 |