Round soda-lime glass according to and similar to DIN 8902
Product specification: Round sight glass panels
Material: Soda-lime glass
You will find removal rates and further information on the glass in our info data sheet
Soda-lime glasses are required wherever visual inspection of processes in containers must be ensured under pressure, at low thermal and chemical stress.
Operating conditions:
Temperature: 150 °C / 302 °F long-term
Pressure: depending on diameter and thickness
Calculation of the pressure resistance: TOOL - Glass consultant soda-lime glass
Technical information:
Coefficient of expansion at 20 °C / 300 °C (68 °F / 572 °F) : 9,5 x 10–6 K–¹
Thermal shock resistance: 150 °C / 302 °F
Chemical resistance:
Water resistance DIN ISO 719/720: Hydrolysis class 1
Acid resistance DIN 12116: Acid class 1
Alkali resistance DIN 52332: Alkali class 2
Permissible material defects:
Round bubbles enclosed in the glass may have a maximum diameter of 2 mm. Oval bubbles must not exceed the value (length + width)/2 = 2 mm. Pointed bubbles are not permitted.
Permissible bubble frequency
| Bubble diameter d3 | Permissible bubble frequency |
| d3 < 0,3 | 3 pieces per cm² visible surface |
| 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 |
Dimensional tolerances:
The dimensional tolerances are in accordance with DIN 8902 for sightglass panels 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 |
