SF55 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) | 1.7618 |
|---|---|
| Abbe Number (Vd) | 26.950177 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.64681\,\lambda^2}{\lambda^2 - 0.0128731} + \frac{0.33154\,\lambda^2}{\lambda^2 - 0.0564818} + \frac{1.02466\,\lambda^2}{\lambda^2 - 116.271}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.2 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.99 \times 10^{-6} + 2(1.73 \times 10^{-8})\,\Delta T + 3(-2.19 \times 10^{-11})\,\Delta T^2 + \frac{1.52 \times 10^{-6} + 2(1.44 \times 10^{-9})\,\Delta T}{\lambda - 0.267}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.72 |
|---|---|
| Relative Cost | 3.57 |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 2 |
| Acid Resistance | 3 |
| Alkali Resistance | 2 |
| Phosphate Resistance | 3 |
Notes
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Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| FDS5 | Hoya | 1.761804 | 26.914901 | |
| D62-27 | Corning | 1.761802 | 26.90455 | |
| PBH25 | Ohara | 1.761797 | 27.107724 | |
| PBH25W | Ohara | 1.761797 | 27.107726 | |
| FD140 | Hoya | 1.76182 | 26.61 | |
| H-ZF12 | CDGM | 1.76182 | 26.607986 | |
| ZF12 | CDGM | 1.761822 | 26.555686 | |
| PBH14 | Ohara | 1.761819 | 26.553651 | |
| PBH14W | Ohara | 1.761819 | 26.553651 | |
| FD14 | Hoya | 1.761823 | 26.552048 |