Tempered Borosilicate Sight Glass Disc | Borosilicate Sight Glass, Tempered Sight Glass Disc
Product Overview
The tempered borosilicate sight glass disc is a standard choice for buyers searching for a borosilicate sight glass, tempered sight glass disc, or tempered sight glass for process equipment. Published DIN 7080 datasheets describe this product family as tempered borosilicate glass, both sides ground and polished, and intended for pressure duties in industrial service.
This product is widely used where operators need a reliable visual window into tanks, vessels, or process lines. DIN 7080 guidance states that sight glass discs should be treated as safety-critical components and replaced after dismantling rather than reused.
Typical Applications
Tempered borosilicate sight glass discs are used in industrial systems where visibility, thermal resistance, and chemical durability matter. The DIN 7080 handbook states that the standard covers borosilicate glass quality and that the glass must pass tests for material strength, shock endurance, chemical resistance, and compression.
Typical application areas include:
- process tanks and pressure vessels
- liquid level observation systems
- chemical process equipment
- industrial sight glass fittings
- sanitary and utility process lines
Material and Performance
Material Properties
| Property | Value | Source |
|---|---|---|
| Glass type | Borosilicate glass 3.3 | |
| Density, annealed | 2.23–2.24 ± 0.02 g/cm³ | |
| Thermal expansion coefficient | 3.3 × 10⁻⁶/K | |
| Strain point | 510°C | |
| Annealing point | 560°C ±10°C | |
| Softening point | 815–820°C ±10°C | |
| Chemical resistance | High chemical durability | |
| Temperature limits | 490°C / 230°C (extreme service / normal service) |
Why Buyers Choose This Product
The main advantages of a tempered borosilicate sight glass disc : high thermal resistance, strong chemical durability, standardized circular sizes, and a polished finish for clear visual inspection.
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 |
Other dimensions are available on request.
Product Reference Data
| Parameter | Value | Source |
|---|---|---|
| Product name | Tempered borosilicate sight glass disc | |
| Common aliases | Borosilicate Sight Glass / Tempered Sight Glass Disc / Tempered Sight Glass | |
| Material | Tempered borosilicate glass | |
| Surface finish | Both sides ground and polished | |
| Standard family | DIN 7080 | |
| Pressure duty | For pressure duties | |
| Temperature duty | Up to 280°C | |
| Low temperature limit | No low temperature limit stated | |
| Custom sizes | Other dimensions on request |
Quality Proof and Evidence
- inspection report image
- pressure or thermal test record
- customer installation photo
- certificate upload area
- dimensional drawing screenshot
FAQ
What is a tempered borosilicate sight glass disc?
It is a circular industrial glass disc made from tempered borosilicate glass and used as the viewing window in a sight glass assembly.
Is “borosilicate sight glass” a common search term?
Yes. In practice, buyers often search using shorter product names such as Borosilicate Sight Glass or Tempered Sight Glass Disc when looking for the disc component rather than the full assembly.
What standard is commonly used?
The published circular disc datasheet references DIN 7080 for borosilicate glass. The handbook also states that DIN 7080 covers glass strength, shock endurance, chemical resistance, and compression.
What temperature can it handle?
The DIN 7080 circular disc datasheet states up to 280°C for borosilicate glass.
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