Soda-Lime Round Sight Glass | DIN 8902 Circular Sight Glass Disc
Product Overview
The product is commonly searched as soda-lime round sight glass, DIN 8902 sight glass, circular sight glass disc, and disc sight glass round. Supplier literature describes this product family as a round sight glass plate made from toughened soda lime glass, with ground and polished surfaces for industrial sight glass fittings.
This type of sight glass is used where visual inspection is needed under low thermal and chemical stress, especially in containers and pipelines. That is why it is widely positioned as a cost-effective option for industrial observation duties that do not require borosilicate or quartz.
Typical Applications
Soda-lime round sight glass is used in industrial equipment where operators need direct visual confirmation of process status without opening the system. Published technical notes describe this glass type as suitable for visual inspection in vessels or pipelines under pressure and low thermal load.
Typical applications include:
- tanks and vessels
- liquid observation points
- low-temperature process lines
- non-aggressive media monitoring
- general industrial sight glass assemblies
Material and Performance
The standard material is toughened soda lime glass according to DIN 8902 or a similar specification. The product is intended for pressure duties at temperatures up to 150°C, with no lower temperature limit, and that some versions can be supplied with optional coating.
Material Properties
| Property | Value | Reference |
|---|---|---|
| Material | Soda lime glass | |
| Glass type | Toughened / tempered soda lime glass | |
| Temperature limit | Up to 150°C | |
| Lower temperature limit | No lower temperature limit stated | |
| Thermal expansion coefficient | 9.5 × 10⁻⁶ K⁻¹ at 20°C/300°C | |
| Thermal shock resistance | 150°C | |
| Surface finish | Ground and polished |
Why Buyers Choose This Product
It is a practical and economical option for low-thermal-load applications, it is made in standardized circular sizes, and it is supplied in a tempered, ground and polished form suitable for industrial sight glass fittings.
Technical Specifications
Standard Size and Pressure Data for Soda-Lime Round Sight Glass
| Outer Size (D × s, mm) | Viewing Diameter (mm) | Nominal Pressure (bar) | Standard / Source |
|---|---|---|---|
| 45 × 10 | 32 | 40 | DIN 8902 datasheet |
| 63 × 10 | 48 | 16 | DIN 8902 datasheet |
| 80 × 12 | 65 | 16 | DIN 8902 datasheet |
| 100 × 15 | 80 | 16 | DIN 8902 datasheet |
| 125 × 15 | 100 | 10 | DIN 8902 datasheet |
| 125 × 20 | 100 | 16 | DIN 8902 datasheet |
| 150 × 20 | 125 | 10 | DIN 8902 datasheet |
| 150 × 25 | 125 | 16 | DIN 8902 datasheet |
| 175 × 20 | 150 | 10 | DIN 8902 datasheet |
| 175 × 25 | 150 | 16 | DIN 8902 datasheet |
| 200 × 20 | 175 | 8 | DIN 8902 datasheet |
| 200 × 25 | 175 | 10 | DIN 8902 datasheet |
| 200 × 30 | 175 | 16 | DIN 8902 datasheet |
| 250 × 25 | 225 | 8 | DIN 8902 datasheet |
| 250 × 30 | 225 | 10 | DIN 8902 datasheet |
Product Reference Data
| Parameter | Value | Reference |
|---|---|---|
| Product type | Soda-lime round sight glass | |
| Common aliases | Round sight glass disc / circular sight glass disc / disc sight glass round | |
| Standard | DIN 8902 | |
| Material | Toughened soda lime glass | |
| Surface finish | Ground and polished | |
| Operating temperature | Up to 150°C | |
| Low-temperature behavior | No lower temperature limit stated | |
| Custom sizes | Available on request |
Quality Proof and Evidence
- inspection report
- dimensional check sheet
- customer installation photo
- pressure or thermal test record
- certificate upload area
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FAQ
What is a soda-lime round sight glass?
It is a circular sight glass disc made from toughened soda lime glass and used for visual inspection in industrial sight glass fittings.
What is the common search term for this product?
Buyers also search for DIN 8902 sight glass, round sight glass disc, and circular sight glass disc.
What temperature can it handle?
The published operating limit for DIN 8902 soda-lime sight glass is up to 150°C, with no lower temperature limit stated in the datasheets.
Are custom sizes available?
Yes. The published datasheets state that special or custom sizes can be manufactured on request.
