K-FK5 by Sumita
Standard
Rare
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) | 1.48749 |
|---|---|
| Abbe Number (Vd) | 70.4 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.1892 - 0.00976422\,\lambda^2 + 0.00869174\,\lambda^{-2} + 0.000236466\,\lambda^{-4} - 1.77 \times 10^{-5}\,\lambda^{-6} + 9.69896 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.8 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.8 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-7.46 \times 10^{-6} + 2(1.15 \times 10^{-8})\,\Delta T + 3(-2.45 \times 10^{-10})\,\Delta T^2 + \frac{3.01 \times 10^{-7} + 2(2.4 \times 10^{-9})\,\Delta T}{\lambda - 0.169}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.45 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 5 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| FK5 | Schott | 1.48749 | 70.405771 | |
| N-FK5 | Schott | 1.48749 | 70.41 | |
| FC5 | Hoya | 1.48749 | 70.44 | |
| H-QK3LGTI | CDGM | 1.48749 | 70.440487 | |
| D-QK3L | CDGM | 1.48749 | 70.440487 | |
| H-QK3L | CDGM | 1.48749 | 70.440487 | |
| S-FSL5Y | Ohara | 1.48749 | 70.354425 | |
| FK5HTi | Schott | 1.48748 | 70.47 | |
| D-QK3L-25 | CDGM | 1.48687 | 70.417086 | |
| A87-70 | Corning | 1.487248 | 70.500557 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| FK5 | Sumita | 1.48749 | 70.4 | |
| K-PG325(M) | Sumita | 1.50506 | 70.4 | |
| K-PG325 | Sumita | 1.5067 | 70.5 | |
| BK10 | Sumita | 1.49782 | 67.0 | |
| K-PMK30(M) | Sumita | 1.52002 | 70.2 | |
| BK4 | Sumita | 1.50048 | 66.0 | |
| K-PMK30 | Sumita | 1.525 | 70.4 | |
| BK3 | Sumita | 1.49831 | 65.1 | |
| BK7 | Sumita | 1.51633 | 64.1 | |
| K-BK7 | Sumita | 1.51633 | 64.1 |