What are sapphire glass sight glass plates suitable for?
Sapphire glass is highly resistant to extreme thermal and chemical stresses and is ideal for applications that require visual inspections at high temperatures and aggressive media.
Specifications for Sapphire glass sight glass plates
Product specification: Circular sight glass plates, longitudinal sight glass plates, sight glass rings / tubes
Material: Sapphire monocrystal
Optical properties as well as further information about the glass can be found in our info data sheet
Sapphire monocrystal sight glasses are required wherever visual inspection of processes in vessels must be ensured under extreme thermal and chemical stresses.
Sapphire glass consists of 99.997% Al2O3 and is therefore highly suitable for transmission in the UV range. It is characterized by above-average chemical resistance. Additionally, it is the best choice for extreme high-temperature applications.
Through production and quality checks during the process flow, the property values of the glasses and the tight dimensional tolerances are guaranteed. With these excellent properties, these sight glasses are suitable for extreme conditions.
Operating conditions:
Temperature: up to 2000 °C
Pressure: depends on diameter and thickness
Calculation of pressure resistance: TOOL - Glass advisor Sapphire glass
Technical Information:
Coefficient of expansion at 25 °C/50 °C: 6.6 x 10⁻⁶ cm/°C
Modulus of elasticity: E 4.6 * 10² GN/m
Thermal conductivity at 25 °C: 0.08 cal cm-1 s-1 °C-1
Chemical Resistance:
Water resistance DIN ISO 719/720: Hydrolysis class 1
Acid resistance DIN 12116: Acid class 1
Alkali resistance DIN 52332: Alkali class 1
Quality:
Sapphire glass offers very different qualities. These are, due to the cultivation of the sapphire crystals, completely arbitrary and are determined after testing. Synthetic sapphire glass is assessed to be suitable for the intended application. Either optically, mechanically, etc. A very high-quality sapphire glass produces little to no light scattering or grid distortion and is mainly used for the most demanding optical applications.
Less high-quality sapphire glasses may exhibit high light scattering or grid distortion and are therefore mainly used for mechanical, structural applications and less demanding optical applications. Nevertheless, the sapphire glass, in all qualities, is very high quality compared to other materials, such as borosilicate glass.
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