K-GFK70(M) by Sumita
Preferred
Very Common
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) | 1.56627 |
|---|---|
| Abbe Number (Vd) | 71.3 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.42086 - 0.00573079\,\lambda^2 + 0.0113964\,\lambda^{-2} + 0.000149646\,\lambda^{-4} + 3.80844 \times 10^{-6}\,\lambda^{-6} - 3.27348 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 13.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 15.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.47 \times 10^{-5} + 2(-1.68 \times 10^{-9})\,\Delta T + 3(-2.49 \times 10^{-11})\,\Delta T^2 + \frac{3.77 \times 10^{-7} + 2(3.45 \times 10^{-10})\,\Delta T}{\lambda - 0.178}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.48 |
|---|---|
| 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-ZPK7-25 | CDGM | 1.56854 | 71.235367 | |
| D-ZPK7 | CDGM | 1.56907 | 71.304254 | |
| H-ZPK7 | CDGM | 1.56907 | 71.304254 | |
| N-PSK58 | Schott | 1.56907 | 71.205585 | |
| FCD615 | Hoya | 1.57144 | 71.61 | |
| B58-72 | Corning | 1.558086 | 71.998499 | |
| FCD500 | Hoya | 1.55397 | 71.76 | |
| MP-FCD500-20 | Hoya | 1.55352 | 71.72 | |
| MC-FCD500-20 | Hoya | 1.55352 | 71.72 | |
| M-FCD500 | Hoya | 1.55332 | 71.69 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| GFK70 | Sumita | 1.56907 | 71.3 | |
| K-GFK70 | Sumita | 1.56907 | 71.3 | |
| K-PSK500 | Sumita | 1.55215 | 72.0 | |
| K-PSK500(M) | Sumita | 1.55 | 71.9 | |
| K-PMK155 | Sumita | 1.5582 | 68.2 | |
| K-PMK155(M) | Sumita | 1.55471 | 68.0 | |
| K-GFK68(M) | Sumita | 1.58998 | 68.3 | |
| GFK68 | Sumita | 1.5924 | 68.3 | |
| K-GFK68 | Sumita | 1.5924 | 68.3 | |
| K-PSK400(M) | Sumita | 1.59179 | 67.7 |