Borosilicate
Glass

For demanding tasks

Strong Metrics

Thermal Expansion Coefficient

(Lower is better)

3.3

× 10-6/K

Borosilicate Glass

9.0

× 10-6/K

Soda Lime Glass

Silica Content

80

%

Borosilicate Glass

70

%

Soda Lime Glass

Working Temperature Range

Up to

500

°C

Borosilicate Glass

Up to

150

°C

Soda Lime Glass

Highest precision. Always.

Glass

As versatile as your ideas

We are equally committed to practicing classical glass craftsmanship and to further develop this material for entirely new fields and applications.

With great conviction our company develops and designs top quality products for the modern lifestyle and for the very challenging high performance industry.

Refractive Index

1.474

Softening Point

821°C

Acid / Hydrolytic Class

Class 1

B2O3 Content

12%

Mohs Hardness

6.5

For demanding applications

Borosilicate Glass

Quality and Precision

The Know-How of Generations

In our home town of Kaufbeuren, we combine our vast experience, which includes tradition as well as innovation, to create true art: The art of making glass products. We are very proud of this extremely valuable skill, as glass is an important cultural and historical part of life.

For three generations, Stumpe Glas has been delivering its unique products all over the world. We are proud to serve our customers with devotion and dedication.

Highest Resilience

Beads for Research and Development

An important part of our manufacturing operation is the production of beads made from every conceivable type of glass. In particular, our borosilicate beads, which are produced through a unique heat conversion process, are very useful for all types of specialized applications.

Their heat resistance and chemical resilience to aggressive substances are unique properties required for use in laboratories, the medical sector, and Bio-Science.

Borosilicate Glass Beads

Our borosilicate glass beads, starting with a size of just 1 mm, are used in many areas of daily life.
Our outstanding quality is thereby known and valued world-wide.

Glass Beads

Individual, high-quality and diverse - these are the glass beads from Stumpe Glas. Our glass beads and glass spheres are available in various sizes, colors and designs.

“After all, it is only the spirit that makes every technology come alive.”

Johann Wolfgang von Goethe

Take a look at our comprehensive product catalog.

To the catalog

Contact us about your individual product requirements.

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