DIN 7080 vs DIN 7081: What Is the Difference?
DIN 7080 vs DIN 7081 Sight Glass
Both DIN 7080 and DIN 7081 are widely used borosilicate glass standards for industrial pressure applications. However, they are designed for different glass shapes and equipment configurations.
DIN 7080 and DIN 7081 are two important German standards for industrial sight glasses made from borosilicate glass. Although both are used for
pressure‑resistant visual inspection, they should not be considered interchangeable products.
The most important difference is the glass geometry. DIN 7080 is associated with circular sight glass plates,while DIN 7081 is associated with oblong or elongated sight glasses.The correct choice depends on the equipment design, viewing requirements,dimensions, pressure, temperature, and installation method.
DIN 7080 vs DIN 7081: Quick Comparison
| Feature | DIN 7080 | DIN 7081 |
|---|---|---|
| Glass shape | Circular / round | Oblong / elongated |
| Glass type | Pressure‑resistant borosilicate glass | Pressure‑resistant borosilicate glass |
| Typical use | Industrial observation windows | Level gauges and extended viewing areas |
| Typical equipment | Vessels, tanks, reactors, process equipment | Level gauges, vessels and process equipment |
| Installation | Round sight glass fitting or flange assembly | Oblong / long sight glass assembly |
| Main selection factor | Round viewing window design | Long or extended viewing area |
What Is DIN 7080 Sight Glass?
DIN 7080 covers pressure‑resistant circular sight glass plates made from thermally toughened borosilicate glass. These sight glasses are commonly
installed in industrial equipment where operators need direct visual access to a process medium.
Because the glass is circular, DIN 7080 is normally used together with round sight glass fittings, flanges, retainers, and sealing components.
DIN 7080 is the suitable standard to consider when your equipment requires
a circular pressure‑resistant borosilicate sight glass.
Typical DIN 7080 Applications
- ✓Pressure vessels and process vessels
- ✓Industrial tanks and reactors
- ✓Pipeline observation systems
- ✓Process equipment
- ✓Flow and process monitoring
- ✓Industrial visual inspection windows
Learn more about our Circular Sight Glass products and available industrial glass solutions.
What Is DIN 7081 Sight Glass?
DIN 7081 covers pressure‑resistant oblong or elongated sight glasses made from borosilicate glass. Compared with the circular design of DIN 7080, DIN 7081 provides a longer viewing area.
This elongated configuration makes DIN 7081 particularly suitable for level gauge applications and equipment where operators need to observe a larger vertical or horizontal section.
DIN 7081 is commonly selected when an elongated or oblong sight glass
is required, particularly for industrial level indication systems.
Typical DIN 7081 Applications
- ✓Level gauge systems
- ✓Boilers and process vessels
- ✓Liquid level observation
- ✓Industrial tanks
- ✓Pressure equipment
- ✓Process monitoring systems
See our DIN 7081 Gauge Glass for more information about this product category.
DIN 7080 vs DIN 7081: The 4 Main Differences
1. Shape
DIN 7080 uses a circular glass design, while DIN 7081 uses
an elongated or oblong design. The shape must match the
mechanical structure of the sight glass assembly.
2. Viewing Area
DIN 7080 provides a compact circular viewing area. DIN 7081
provides an extended viewing area that is particularly useful
for level indication and long viewing sections.
3. Equipment Design
DIN 7080 is commonly installed in round sight glass fittings.
DIN 7081 requires an assembly designed for its elongated glass
geometry.
4. Application
DIN 7080 is widely used for general process observation,
while DIN 7081 is commonly associated with level gauge and
extended viewing applications.
DIN 7080 vs DIN 7081: Which One Should You Choose?
The correct standard should be selected based on the existing equipment and required viewing configuration rather than simply choosing one
standard over the other.
Choose DIN 7080 When
- ✓You need a circular sight glass.
- ✓Your equipment has a round sight glass fitting.
- ✓You need general process observation.
- ✓You are replacing an existing DIN 7080 glass.
- ✓The required glass is circular.
Choose DIN 7081 When
- ✓You need an elongated sight glass.
- ✓Your equipment uses a long sight glass assembly.
- ✓You require an extended viewing area.
- ✓The application is a level gauge.
- ✓You are replacing an existing DIN 7081 glass.
Can DIN 7080 and DIN 7081 Be Interchanged?
DIN 7080 and DIN 7081 should not be treated as interchangeable sight glass standards.
Even though both products can use borosilicate glass, their geometry,mounting arrangement, sealing system, and mechanical support can be different.
A circular DIN 7080 glass should not simply be substituted for an elongated DIN 7081 glass without confirming the complete equipment design.
When replacing an existing sight glass, always confirm the original standard, dimensions, fitting, pressure, temperature, and sealing requirements.
What Information Is Needed to Order DIN 7080 or DIN 7081?
Providing complete technical information helps avoid incorrect
replacement glass and allows the manufacturer to evaluate the
application correctly.
Recommended information:
- ✓DIN standard
- ✓Glass shape
- ✓Glass diameter or length and width
- ✓Glass thickness
- ✓Operating pressure
- ✓Operating temperature
- ✓Process medium
- ✓Fitting or flange information
- ✓Required quantity
- ✓Drawing or photograph of the existing glass
DIN 7080 and DIN 7081 for High‑Temperature Applications
Borosilicate glass is widely used in industrial sight glass applications because of its good thermal shock resistance, chemical resistance, optical clarity, and relatively low thermal expansion.
However, the maximum allowable operating temperature should not be determined from the glass material alone. The complete sight glass assembly must be considered.
For applications involving steam, rapid heating or cooling, elevated pressure, or repeated temperature cycling, the glass, metal fitting,gasket, O‑ring, mounting method, and operating conditions should all be evaluated together.
If you want to understand how different sight glass materials perform in industrial applications, see our guide:
How to Choose the Right Sight Glass Material
.
Frequently Asked Questions
Is DIN 7080 a round sight glass?
Yes. DIN 7080 covers circular pressure‑resistant sight glass plates made from thermally toughened borosilicate glass.
Is DIN 7081 a long sight glass?
Yes. DIN 7081 is associated with pressure‑resistant oblong or elongated borosilicate sight glasses.
Are DIN 7080 and DIN 7081 made from borosilicate glass?
Both standards are associated with borosilicate glass for pressure‑resistant industrial sight glass applications.The exact specification should be confirmed for the required product and application.
Which is better, DIN 7080 or DIN 7081?
Neither is universally better. The correct choice depends on the equipment design. DIN 7080 is intended for circular sight glass plates, while DIN 7081 is intended for elongated or oblong sight glasses.
Can DIN 7081 replace DIN 7080?
Not directly. Their shapes and mounting configurations are different. Always confirm the complete assembly and dimensions before selecting a replacement.
Can I order a customized DIN 7080 or DIN 7081 sight glass?
Customized dimensions and configurations may be available depending on the application. Providing a technical drawing,dimensions, operating pressure, temperature, and quantity will help determine the suitable solution.
DIN 7080 vs DIN 7081: Final Selection Guide
DIN 7080 and DIN 7081 serve different industrial sight glass requirements. The main distinction is the geometry of the glass and the corresponding equipment design.
| If You Need… | Consider |
|---|---|
| A circular sight glass | DIN 7080 |
| An elongated or oblong sight glass | DIN 7081 |
| A general process observation window | DIN 7080 or another suitable sight glass design |
| A long viewing section or level gauge glass | DIN 7081 or another suitable gauge glass design |
Need DIN 7080 or DIN 7081 Sight Glass?
Lumistar Special Glass Technology supplies industrial borosilicate
sight glass solutions for vessels, pipelines, level gauges,
reactors, tanks, and process equipment.
If you are not sure which standard or configuration you need,
send us your drawing, dimensions, operating temperature,
operating pressure, process medium, and required quantity.
Our team can help identify a suitable sight glass solution.
