Sapphire glass is resistant, hard, chemically stable and it is an excellent material for sight glasses in an unfavorable environment.
Sapphire glass may be cleaned repeatedly without any damage! It is resistant to temperature up to 2000 degrees C and is used in situations where there are considerable differences of pressures. Due to high costs of production and high hardness at grinding, small size elements are used.
Application:
- Optical industry
(UV and infrared, telemetry, gas and air analyzers) - Measuring devices, meters of electricity, water, flow
(wear resistance) - Spray nozzles, cleaning in the water jets, rods
Basic parameters of sapphire glass:
| PARAMETER | VALUE |
| Density | 3,98g /cm3 |
| Hardness | 9 (Mohs scale) |
| Softening point | 2040oC |
| Thermal expansion coefficient | 6,7 x 10-6/oC parallel to C-axis 5,0 x 10-6/oC perpendicular to C-axis |
| Thermal conductivity | 46,06 W / m oK with 0oC |
| Compressive strength | GPa 2,0 |
| Bending strength | daN/mm2 35 do 39 |
| Tensile strength | MPa 400 with 25oC MPa 275 with 500oC MPa 345 with 1000oC |
| Dielectric constant | 11,5 (103 - 109 Hz, 25oC parallel to C-axis 9,3 (103 - 109 Hz, 25oC perpendicular to C-axis |
| Effective resistance | 1016 ohm - cm (25oC) 1011 ohm - cm (500oC) 106 ohm - cm (1000oC) |
| Structure | a = b = 4,77 A c = 13,04 A |