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DIN 7081 Gauge Glass
DIN 7081 Gauge Glass is designed for reliable liquid level indication in boilers, pressure vessels, water treatment systems and chemical process equipment.
Available in Reflex and Transparent types, our gauge glass is manufactured from Borosilicate Glass or Aluminosilicate Glass, offering excellent thermal shock resistance, chemical durability and operating pressures up to 400 bar depending on material selection.
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Technical data
DIN 7081 Gauge Glass
Reflex & Transparent Level Gauge Glass for High Pressure Applications
DIN 7081 gauge glass is specifically engineered for industrial level indication applications where reliable visibility, mechanical stability, and safe operation under pressure are required.
Designed for use in boilers, pressure vessels, and process systems, it provides stable optical performance under continuous exposure to high temperature, pressure fluctuations, and aggressive working media.
Compared with standard industrial glass, borosilicate glass 3.3 and aluminosilicate glass offer superior thermal shock resistance, enhanced chemical durability, and improved mechanical strength, making them suitable for demanding industrial environments.
Each gauge glass is manufactured through precision cutting, fine grinding, and double-side polishing processes to ensure tight dimensional tolerance, smooth sealing surfaces, and consistent optical clarity for safe and accurate level observation.
Custom sizes, thickness options, edge finishes, and pressure resistance designs are available according to specific project and engineering requirements.
DIN 7081 Gauge Glass — Technical Data
| DIN7081 — Glass material properties | ||||
|---|---|---|---|---|
| Property | Soda-lime | Borosilicate | Aluminosilicate | Alkali resistance |
| Pressure resistant performance | 10–40 Bar | 10–64 Bar | 10–320 Bar | 10–400 Bar |
| Thermal Shock | 150°C | 280°C | 280°C | 280°C |
| Transition temperature | 490°C | 550°C | 720°C | 820°C |
| Vertical relaxation temperature | 530°C | 590°C | 790°C | 890°C |
| Softening point | 700°C | 820°C | 920°C | 950°C |
| Heat resistance | ≤180°C | ≤300°C | ≤375°C | ≤375°C |
| Density | 2.5 g/cm³ | 2.21 g/cm³ | 2.60–2.70 g/cm³ | 3.4–3.95 g/cm³ |
| Young’s modulus | 72 GPa | 66 GPa | 84 GPa | 112 GPa |
| Flexural strength | 120–160 MPa | 120–160 MPa | 240–320 MPa | 420–450 MPa |
| Water resistance (ISO 719) | Level 1 | Level 1 | Level 1 | Level 1 |
| Acid resistance (DIN 12116) | A1 | A1 | A1 | A1 |
| Alkali resistance (ISO 695) | A2 | A2 | A2 | A1 |
Cross-section drawing
Dimensions — DIN 7081 Gauge Glass
| Transparent glass according to DIN 7081 – 30 mm width | ||||
|---|---|---|---|---|
| Length in mm | Width in mm | Thickness in mm | MAXOS®Product code | Lumiglas code |
| 115 | 30 | 17 | 2071768 | LMX2071768 |
| 140 | 30 | 17 | 2071769 | LMX2071769 |
| 165 | 30 | 17 | 2071770 | LMX2071770 |
| 190 | 30 | 17 | 2071771 | LMX2071771 |
| 220 | 30 | 17 | 2071772 | LMX2071772 |
| 250 | 30 | 17 | 2071773 | LMX2071773 |
| 280 | 30 | 17 | 2071774 | LMX2071774 |
| 320 | 30 | 17 | 2071775 | LMX2071775 |
| 340 | 30 | 17 | 2071776 | LMX2071776 |
| Other sizes can be customized. | ||||
| Transparent glass according to DIN 7081 – 34 mm width | ||||
|---|---|---|---|---|
| Length in mm | Width in mm | Thickness in mm | MAXOS®Product code | Lumiglas code |
| 95 | 34 | 17 | 2071817 | LMX2071817 |
| 115 | 34 | 17 | 2071777 | LMX2071777 |
| 140 | 34 | 17 | 2071778 | LMX2071778 |
| 165 | 34 | 17 | 2071779 | LMX2071779 |
| 190 | 34 | 17 | 2071780 | LMX2071780 |
| 220 | 34 | 17 | 2071781 | LMX2071781 |
| 250 | 34 | 17 | 2071782 | LMX2071782 |
| 280 | 34 | 17 | 2071783 | LMX2071783 |
| 300 | 34 | 17 | 2071784 | LMX2071784 |
| 320 | 34 | 17 | 2071785 | LMX2071785 |
| 340 | 34 | 17 | 2071786 | LMX2071786 |
| 370 | 34 | 17 | 2071787 | LMX2071787 |
| 400 | 34 | 17 | 2071788 | LMX2071788 |
| 420 | 34 | 17 | 2071790 | LMX2071790 |
| 460 | 34 | 17 | 2071791 | LMX2071791 |
| 480 | 34 | 17 | 2071792 | LMX2071792 |
| 500 | 34 | 17 | 2071793 | LMX2071793 |
| Other sizes can be customized. | ||||
| Reflective glass according to DIN 7081 – 30 mm width | ||||
|---|---|---|---|---|
| Length in mm | Width in mm | Thickness in mm | MAXOS®Product code | Lumiglas code |
| 115 | 30 | 17 | 2071675 | LMX2071675 |
| 140 | 30 | 17 | 2071676 | LMX2071676 |
| 165 | 30 | 17 | 2071677 | LMX2071677 |
| 190 | 30 | 17 | 2071678 | LMX2071678 |
| 220 | 30 | 17 | 2071679 | LMX2071679 |
| 250 | 30 | 17 | 2071680 | LMX2071680 |
| 280 | 30 | 17 | 2071681 | LMX2071681 |
| 320 | 30 | 17 | 2071682 | LMX2071682 |
| 340 | 30 | 17 | 2071683 | LMX2071683 |
| Other sizes can be customized. | ||||
| Reflective glass according to DIN 7081 – 34 mm width | ||||
|---|---|---|---|---|
| Length in mm | Width in mm | Thickness in mm | MAXOS®Product code | Lumiglas code |
| 95 | 34 | 17 | 2071716 | LMX2071716 |
| 115 | 34 | 17 | 2071684 | LMX2071684 |
| 140 | 34 | 17 | 2071685 | LMX2071685 |
| 165 | 34 | 17 | 2071686 | LMX2071686 |
| 190 | 34 | 17 | 2071687 | LMX2071687 |
| 220 | 34 | 17 | 2071688 | LMX2071688 |
| 250 | 34 | 17 | 2071689 | LMX2071689 |
| 280 | 34 | 17 | 2071690 | LMX2071690 |
| 300 | 34 | 17 | 2071713 | LMX2071713 |
| 320 | 34 | 17 | 2071691 | LMX2071691 |
| 340 | 34 | 17 | 2071692 | LMX2071692 |
| 370 | 34 | 17 | 2071693 | LMX2071693 |
| 400 | 34 | 17 | 2071694 | LMX2071694 |
| 430 | 34 | 17 | 2071695 | LMX2071695 |
| 460 | 34 | 17 | 2071696 | LMX2071696 |
| Other sizes can be customized. | ||||
KEY FEATURES
Superior Pressure Resistance
Ideal for high-pressure vessels, vacuum chambers, and harsh industrial environments
Excellent Thermal Shock Stability
Withstands rapid temperature changes without cracking or deformation
High Chemical Durability
Resistant to acids, alkalis, and aggressive industrial media
Clear Optical Visibility
Ensures precise and reliable liquid level reading under all working conditions
Reflex & Transparent Design Options
Available in both prism-reflex and fully transparent structures for different applications
Custom Design Support
OEM / ODM customization available
Custom Manufacturing Service
We provide tailor-made solutions according to drawings or technical requirements.
- Custom diameter
- Custom thickness
- Special pressure design
- Edge polishing
- Optical finishing
- OEM / ODM support
- Custom packaging
TYPICAL APPLICATIONS
- Pressure Vessels
- Chemical Reactors
- Boilers & Steam Systems
- Pipeline Sight Glass Assemblies
- Pharmaceutical Equipment
- Food & Beverage Processing
- Industrial Observation Ports
FAQ
A: DIN 7081 gauge glass is used for visual liquid level monitoring in boilers, pressure vessels, and industrial tanks. It provides a safe and reliable way to observe fluid levels under high temperature and pressure conditions.
A: Reflex gauge glass uses prism grooves to enhance contrast, making liquid levels easier to read. Transparent gauge glass allows direct observation of the process fluid and is often used where color or clarity of liquid needs to be monitored.
A: Yes. DIN 7081 gauge glass is designed for high-pressure environments such as boilers and industrial vessels, with excellent mechanical strength and thermal resistance.
A: Yes. We provide custom dimensions, edge finishing, and OEM production based on drawings or technical requirements.
A: It is widely used in power plants, chemical industries, oil & gas facilities, marine systems, and water treatment plants.
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