SF64A by Schott
Obsolete
Unknown
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) | 1.70585 |
|---|---|
| Abbe Number (Vd) | 30.299703 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.60088\,\lambda^2}{\lambda^2 - 0.0120157} + \frac{0.210665\,\lambda^2}{\lambda^2 - 0.0601646} + \frac{1.50114\,\lambda^2}{\lambda^2 - 136.256}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.5 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.8 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.87 \times 10^{-6} + 2(9.36 \times 10^{-9})\,\Delta T + 3(-3.49 \times 10^{-11})\,\Delta T^2 + \frac{9.07 \times 10^{-7} + 2(1.28 \times 10^{-9})\,\Delta T}{\lambda - 0.275}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.0 |
|---|---|
| Relative Cost | 4.21 |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 1 |
| Alkali Resistance | 1 |
| Phosphate Resistance | 1 |
Notes
old
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| S-TIH20 | Ohara | 1.70585 | 30.244176 | |
| C99-30 | Corning | 1.699002 | 30.107427 | |
| S-TIM35 | Ohara | 1.698947 | 30.127865 | |
| PBM35 | Ohara | 1.698947 | 30.121211 | |
| ZF11 | CDGM | 1.698949 | 30.065686 | |
| E-FD15L | Hoya | 1.69895 | 30.05 | |
| E-FD15 | Hoya | 1.69895 | 30.05 | |
| FD15 | Hoya | 1.698945 | 30.050548 | |
| H-ZF11 | CDGM | 1.69894 | 30.05045 | |
| SF15 | Sumita | 1.69895 | 30.0 |