K-PSFn4 by Sumita
Obsolete
Very 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) | 1.844 |
|---|---|
| Abbe Number (Vd) | 24.8 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.4 — 1.55 µm |
$$n(\lambda) = \sqrt{3.2452 - 0.0113978\,\lambda^2 + 0.0482095\,\lambda^{-2} + 0.00223843\,\lambda^{-4} - 2.80347 \times 10^{-5}\,\lambda^{-6} + 1.88802 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 10.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 12.2 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.02 \times 10^{-6} + 2(2.01 \times 10^{-8})\,\Delta T + 3(-1.33 \times 10^{-10})\,\Delta T^2 + \frac{1.73 \times 10^{-6} + 2(1.55 \times 10^{-9})\,\Delta T}{\lambda - 0.277}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.58 |
|---|---|
| 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 | |
|---|---|---|---|---|
| PBH56 | Ohara | 1.84139 | 24.559059 | |
| PBH53W | Ohara | 1.846658 | 23.885544 | |
| PBH53 | Ohara | 1.846658 | 23.885544 | |
| S-NPH53 | Ohara | 1.84666 | 23.88395 | |
| FDS90-SGP | Hoya | 1.84666 | 23.84 | |
| SF57HT | Schott | 1.84666 | 23.83 | |
| SF57 | Schott | 1.84666 | 23.83 | |
| SF57HTultra | Schott | 1.84666 | 23.83 | |
| ZF52 | CDGM | 1.846669 | 23.827549 | |
| FDS9 | Hoya | 1.846658 | 23.826345 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K-PSFn4(M) | Sumita | 1.83932 | 24.8 | |
| SFLDN3 | Sumita | 1.84666 | 23.9 | |
| SFN3 | Sumita | 1.84666 | 23.9 | |
| K-SFLDn3 | Sumita | 1.8467 | 23.8 | |
| K-SFLDn3W | Sumita | 1.8467 | 23.8 | |
| K-PSFn3 | Sumita | 1.83917 | 23.9 | |
| K-PSFn3(M) | Sumita | 1.83352 | 24.0 | |
| K-PSFn185 | Sumita | 1.8507 | 26.9 | |
| K-PSFn185(M) | Sumita | 1.84524 | 27.1 | |
| SFLD20 | Sumita | 1.81786 | 23.7 |