K-GFK68 by Sumita
Preferred
Very Common
Precision Molding
Environmentally Friendly
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) | 1.5924 |
|---|---|
| Abbe Number (Vd) | 68.3 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.49949 - 0.00592859\,\lambda^2 + 0.0127435\,\lambda^{-2} + 0.000154696\,\lambda^{-4} + 3.99476 \times 10^{-6}\,\lambda^{-6} - 1.76036 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 12.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 15.2 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.36 \times 10^{-5} + 2(2.85 \times 10^{-9})\,\Delta T + 3(4.82 \times 10^{-11})\,\Delta T^2 + \frac{4.01 \times 10^{-7} + 2(2.74 \times 10^{-10})\,\Delta T}{\lambda - 0.183}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.51 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| D-ZPK5-25 | CDGM | 1.59216 | 68.281511 | |
| D-ZPK5 | CDGM | 1.5928 | 68.342024 | |
| H-ZPK5 | CDGM | 1.5928 | 68.342024 | |
| N-PSK57 | Schott | 1.5924 | 68.398667 | |
| FCD505 | Hoya | 1.59282 | 68.62 | |
| FCD515 | Hoya | 1.59282 | 68.62 | |
| S-FPM2 | Ohara | 1.59522 | 67.735723 | |
| H-ZPK3 | CDGM | 1.59349 | 67.285372 | |
| D-ZPK3 | CDGM | 1.59419 | 67.295385 | |
| B96-67 | Corning | 1.596306 | 67.398269 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| GFK68 | Sumita | 1.5924 | 68.3 | |
| K-GFK68(M) | Sumita | 1.58998 | 68.3 | |
| K-PSK400(M) | Sumita | 1.59179 | 67.7 | |
| K-PSK400 | Sumita | 1.595 | 67.8 | |
| K-PSK300 | Sumita | 1.5995 | 65.6 | |
| K-PSK300(M) | Sumita | 1.5969 | 65.3 | |
| K-GFK70 | Sumita | 1.56907 | 71.3 | |
| GFK70 | Sumita | 1.56907 | 71.3 | |
| K-PMK155 | Sumita | 1.5582 | 68.2 | |
| K-GFK70(M) | Sumita | 1.56627 | 71.3 |