What are the characteristics of sight glass plates made of BOROFLOAT®?
BOROFLOAT® sight glasses are used where visual inspection of processes is necessary under pressure as well as thermal and chemical stress. They are characterized by a low expansion coefficient and high temperature resistance, but without thermal tempering.
Specifications of BOROFLOAT® sight glass plates
Product Specification: Circular sight glass plates, longitudinal sight glass plates
Material: BOROFLOAT® 33
Removal rates and further information on the glass can be found in our information datasheet
BOROFLOAT® sight glasses are required wherever visibility for process inspections in containers must be ensured under pressure, thermal, and chemical loads.
Due to the very low thermal expansion coefficient typical for BOROFLOAT® 33, it exhibits high temperature resistance. Additionally, it has excellent thermal shock resistance. BOROFLOAT® glass plates are not thermally tempered (not hardened) and therefore offer significantly higher temperature operating conditions.
Through production and quality inspections during the process flow, the property values of the glasses and the tight dimensional tolerances are guaranteed. With these excellent thermal properties, BOROFLOAT® sight glasses can be used for extreme conditions.
Operating conditions:
Temperature:
- 450 °C permanently
- 500 °C temporarily (< 10 h)
Pressure: depending on diameter and thickness
Calculation of pressure resistance: TOOL - Glass advisor Borofloat glass
Technical Information:
Coefficient of thermal expansion at 20 °C/300 °C: 3.25 x 10⁻⁶ K⁻¹
Modulus of elasticity: 64 kN/mm²
Thermal conductivity at 90 °C: 1.2 W/(m·K)
Photoelastic coefficient K: 4.0 x 10⁻⁶ mm²/N⁻¹
Temperature cycling resistance: 133 °C
Chemical Resistance:
Water resistance DIN ISO 719/720: Hydrolysis class 1
Acid resistance DIN 12116: Acid class 1
Alkali resistance DIN 52332:
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