Optical Properties
The production process under strict quality control minimizes the possibility of defects such as air bubbles or streaks. The low iron oxide content increases the transmission of ultraviolet, visible, and infrared light compared to soda-lime glass. Unlike other types of glass, Borofloat has a low light dispersion.
Electrical Properties
Glass is a good electrical insulator. However, the ability to transfer charges is possible due to concentrated potassium and sodium ions in the glass, especially at elevated temperatures. Due to its low alkali content, Borofloat glass is an excellent insulator, and high temperatures have virtually no impact on it. Therefore, it is suitable for use in electrical devices that require good insulation at high operating temperatures.
Physical Properties
The density of Borofloat glass is among the lowest of silicate-based glasses. Borofloat is highly resistant to scratches and abrasion. However, its bending strength depends on various factors in the environment in which it operates.
| PARAMETER | VALUE |
| Thermal expansion according to ISO 7991 | 3.3 x 10-6 K-1 |
| Transformation temperature | 525 °C |
| Density | 2,23 g/cm-3 |
| Upper cooling temperature limit (1013 dPas) | 560 °C |
| Lower cooling temperature limit (1014.5 dPas) | 510 °C |
| Softening point (107.6 dPas) | 825 °C |
| Maximum short-term operating temperature | 500 °C |
| Refractive index | 1,473 |
Thermal Properties
Borofloat glass has one of the lowest thermal expansion coefficients, making it resistant to thermal shocks. Combined with its maximum continuous operating temperature (450 °C), these properties make Borofloat glass ideal for environments requiring high thermal stability.
