SF19 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) | 1.6668 |
|---|---|
| Abbe Number (Vd) | 33.1 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.69469 - 0.00943414\,\lambda^2 + 0.0265094\,\lambda^{-2} + 0.00129385\,\lambda^{-4} - 5.91419 \times 10^{-5}\,\lambda^{-6} + 8.32472 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 8.9 |
| 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) | 4.02 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 2 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| N-SF19 | Schott | 1.66679 | 33.12 | |
| C67-33 | Corning | 1.666997 | 33.114648 | |
| FD19 | Hoya | 1.666797 | 33.059707 | |
| S-TIM39 | Ohara | 1.6668 | 33.054985 | |
| H-ZF39 | CDGM | 1.6668 | 33.053728 | |
| PBM39 | Ohara | 1.666799 | 33.046816 | |
| SF19 | Schott | 1.6668 | 33.005581 | |
| C72-32 | Corning | 1.672698 | 32.31788 | |
| N-SF5 | Schott | 1.67271 | 32.25 | |
| SF5 | Schott | 1.6727 | 32.21 |