DIN 7080 Sight Glass | Borosilicate Circular Sight Glass Disc
Product Overview
The DIN 7080 sight glass is a circular sight glass disc used where operators need a clear window to monitor liquids, process conditions, or vessel status. Supplier literature also calls it a round sight glass plate or circular sight glass disc, which are common search terms used by overseas buyers.
This product family is commonly specified for pressure duties, and the published documentation states that other dimensions are available on request. That makes it suitable both for standard replacement work and for custom industrial assemblies.
Typical Applications
DIN 7080 sight glass is widely used in tanks, vessels, process lines, and other equipment that needs direct visual observation of the medium inside.
Typical applications include:
- tanks and vessels
- liquid level monitoring
- flow observation
- chemical processing
- sanitary process equipment
- industrial sight glass assemblies
Material and Performance
The same material data states that borosilicate glass 3.3 is highly resistant to water, alkalis, acids, and organic substances, which is one reason it is used in industrial sight glass service.
Material Properties
| Property | Value | Source |
|---|---|---|
| Glass type | Borosilicate glass 3.3 | |
| Material condition | Toughened / special tempered | |
| Density | 2.23 ± 0.02 g/cm³ | |
| Thermal expansion coefficient (0–300°C) | 3.3 ± 0.1 × 10⁻⁶/K | |
| Softening point | 815 ± 10°C | |
| Strain point | 560 ± 10°C | |
| Bending strength | 160 N/mm² | |
| Young’s modulus | 64 GPa | |
| Hardness | 5.5 Mohs | |
| Working temperature | Up to 280°C | |
| Low-temperature limit | No lower temperature limit stated |
Why Buyers Choose This Product
Advantages:
- standard circular disc format for easy replacement;
- service up to 280°C in the published borosilicate DIN 7080 literature;
- chemical resistance suited to many industrial media;
- other dimensions available on request for non-standard assemblies.
Technical Specifications
Standard DIN 7080 Size / Pressure Data
| Outer Size (D × s, mm) | Viewing Diameter (mm) | Nominal Pressure (bar) | Standard |
|---|---|---|---|
| 63 × 10 | 48 | 16 | DIN 7080 |
| 80 × 12 | 65 | 16 | DIN 7080 |
| 100 × 15 | 80 | 16 | DIN 7080 |
| 125 × 15 | 100 | 10 | DIN 7080 |
| 125 × 20 | 100 | 16 | DIN 7080 |
| 150 × 20 | 125 | 10 | DIN 7080 |
| 150 × 25 | 125 | 16 | DIN 7080 |
| 175 × 20 | 150 | 10 | DIN 7080 |
| 175 × 25 | 150 | 16 | DIN 7080 |
| 200 × 20 | 175 | 8 | DIN 7080 |
| 200 × 25 | 175 | 10 | DIN 7080 |
| 200 × 30 | 175 | 16 | DIN 7080 |
| 250 × 25 | 225 | 8 | DIN 7080 |
| 250 × 30 | 225 | 10 | DIN 7080 |
Product Reference Data
| Parameter | Value | Source |
|---|---|---|
| Product name | DIN 7080 sight glass | |
| Common aliases | Circular sight glass disc / round sight glass plate / replacement sight glass disc | |
| Material | Borosilicate glass 3.3 | |
| Finish | Ground and polished | |
| Standard | DIN 7080 | |
| Service temperature | Up to 280°C | |
| Custom sizes | Available on request |
Quality Proof and Evidence
- inspection report
- dimensional check sheet
- pressure or thermal test data
- customer installation photo
- certificate upload area
FAQ
What is a DIN 7080 sight glass?
It is a circular borosilicate sight glass plate used in industrial sight glass assemblies for visual inspection.
What material is used for DIN 7080 sight glass?
The published datasheets specify toughened borosilicate glass.
What is the temperature limit?
The published borosilicate DIN 7080 literature states service up to 280°C and no lower temperature limit.
Are custom sizes available?
Yes. The datasheets state that other dimensions are available on request.
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