BACD18 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) | 1.63854 |
|---|---|
| Abbe Number (Vd) | 55.45 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{2.63653 - 0.00975585\,\lambda^2 + 0.0171437\,\lambda^{-2} + 0.000225925\,\lambda^{-4} + 3.08553 \times 10^{-6}\,\lambda^{-6} + 4.58319 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.1 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.93796 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.66 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 4 |
| 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 | |
|---|---|---|---|---|
| H-ZK11 | CDGM | 1.63854 | 55.446553 | |
| N-SK18 | Schott | 1.63854 | 55.423596 | |
| SK18A | Schott | 1.63854 | 55.423596 | |
| SK18 | Sumita | 1.63854 | 55.5 | |
| K-SK18 | Sumita | 1.63854 | 55.5 | |
| K-SK18RH | Sumita | 1.63854 | 55.5 | |
| SK18RH | Sumita | 1.63854 | 55.5 | |
| C39-56 | Corning | 1.638505 | 55.504447 | |
| BSM18 | Ohara | 1.638539 | 55.384768 | |
| S-BSM18 | Ohara | 1.638539 | 55.380028 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| MP-PCD55AR | Hoya | 1.63858 | 55.18 | |
| M-PCD55AR | Hoya | 1.63858 | 55.18 | |
| LACL1 | Hoya | 1.640851 | 56.835319 | |
| LACL2 | Hoya | 1.650201 | 55.737216 | |
| LAC6 | Hoya | 1.642498 | 57.959359 | |
| BACD10 | Hoya | 1.622799 | 56.906336 | |
| E-BACD10 | Hoya | 1.6228 | 56.91 | |
| BACED20 | Hoya | 1.648498 | 53.03151 | |
| E-BACED20 | Hoya | 1.6485 | 53.03 | |
| BACED4 | Hoya | 1.617652 | 55.15751 |