VC78 by Sumita
Obsolete
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) | 1.6691 |
|---|---|
| Abbe Number (Vd) | 55.4 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.73514 - 0.0118221\,\lambda^2 + 0.0182791\,\lambda^{-2} + 0.000179858\,\lambda^{-4} + 1.6773 \times 10^{-5}\,\lambda^{-6} - 5.30706 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 10.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.44 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| D-LAK70 | CDGM | 1.6691 | 55.389689 | |
| D-LAK70-25 | CDGM | 1.668 | 55.295752 | |
| H-LAK11 | CDGM | 1.66461 | 54.612239 | |
| S-LAL12Q | Ohara | 1.6779 | 55.346888 | |
| S-LAL12 | Ohara | 1.6779 | 55.341195 | |
| LAL12 | Ohara | 1.6779 | 55.337587 | |
| H-LAK5A | CDGM | 1.6779 | 55.51497 | |
| LAC12 | Hoya | 1.6779 | 55.52 | |
| D-LAK5-25 | CDGM | 1.67686 | 54.805426 | |
| N-LAK12 | Schott | 1.6779 | 55.2 |