This glass is used for applications with low thermal and chemical stress under pressure to allow for visual inspection in containers. It withstands temperatures up to 150 °C, with the pressure depending on the diameter and thickness. Soda-lime glass has a moderate resistance to water, acids, and alkalis, and the permissible material defects are standardized according to DIN 8902.
Product Specification: Circular sight glass plates
Material: Soda-lime glass
Removal rates and further information about the glass can be found in our info datasheet
Soda-lime sight glasses are required wherever visual inspection of processes in containers must be ensured under pressure, with low thermal and chemical stress.
Temperature: 150 °C permanent
Pressure: depending on diameter and thickness
Calculation of pressure resistance: TOOL - Glass advisor Soda-lime glass
Coefficient of expansion at 20 °C/300 °C: 9.5 x 10⁻⁶ K⁻¹
Temperature cycling resistance: 150 °C
Water resistance DIN ISO 719/720: Hydrolysis class 4
Acid resistance DIN 12116: Acid class 1
Alkali resistance DIN 52332: </strong;Alkali class 2
Round bubbles trapped in the glass may have a maximum diameter of 2 mm. Oval bubbles must not exceed the value (length + width)/2 = 2 mm. Tapered bubbles are not permissible.
Permissible bubble frequency
Bubble diameter d3 | | Permissible bubble frequency |
---|---|
d3 < 0.3 | 3 pieces per cm² of viewing area |
0.3 ≤ d3 ≤ 0.5 | 10 pieces per sight glass plate |
0.5 < d3 ≤ 1 | 4 pieces per sight glass plate |
1 < d3 ≤ 2 | 2 pieces per sight glass plate |
The dimensional tolerances are based on DIN 8902 for sight glass plates made of Soda-lime glass.
Dimensional tolerances according to DIN 8902
Diameter | | Tolerance |
---|---|
up to 125 mm | ± 0.5 mm |
125 to 200 mm | ± 0.8 mm |
over 200 mm | ± 1.0 mm |
Thickness | |
---|---|
10 to 20 mm | ± 0.50 mm |
over 20 mm | ± 0.80 mm |
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