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The Schlieren site specialises in Ematal anodising technical aluminum components for industry, with versatile applications in pneumatics, hydraulics, valve technology, aerospace, defense, food and semiconductor industries.

BWB-Betschart AG

Wagistrasse 7
8952 Schlieren

+41 58 861 90 80

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Discover the latest posts and references. Here you will find a wide range of content and information about our current projects and services.

The advantages of Ematal

Ematal anodised aluminum parts provide a wear-resistant, smooth and virtually non-porous surface that ensures reliable protection against abrasion and corrosion.
The process results in a very low material build-up and is therefore particularly suitable for applications with increased dimensional stability requirements.

Protection against abrasion

Ematal is used when friction is to be minimized by mechanical contact (e.g. in plain bearings), by a flowing medium (e.g. valve bodies and nozzles for gases or liquids) or a combination of these (in pneumatics and hydraulics).

Hard Ematal for added durability

In a specially controlled process, the coating thickness can be increased threefold. The 30 µm thick hard Ematal layers protect parts from particularly high mechanical stresses. As a result, results of up to 600 HV can be achieved.

Optical properties

The Ematal layers have an enamel-like appearance and, depending on the alloy, a light gray to bronze color. Before compaction, it is also possible to enrich the layer with a black dye, which creates a very precious, scratch-resistant surface for visible parts.

Chemical resistance

Ematal has a very high resistance to various acids, salts, solvents and lubricants.


We are happy to offer you the opportunity to sample the Ematal coating on your workpiece so that you can see for yourself its resistance and suitability for your application.


Product data sheet Ematal

Suitability chart aluminium alloys


ISO 9001 / ISO 14001

Electrolytic surface conversions

2500 x 500 x 1000 mm

2500 x 500 x 1000 mm

Pre- and after-treatments

Colour anodising architecture

Colour anodising industry

Chemical surface conversion


Liquid coating

Watch and jewellery making

Mechanical processing

Measuring and testing

Opening hours

Opening hours goods receiving / forwarding


07:15 - 12:00

Afternoon (except Friday)

13:15 - 17:00

Friday afternoon

13:15 - 16:00


April 7, 2023 – Good Friday


April 10, 2023 – Easter Monday


May 1, 2023 – Labour Day


May 18, 2023 – Ascension Day


May 19, 2023 – Bridge day Ascension Day


May 29, 2023 – Whit Monday


August 1, 2023 – National Day


Your contact

For further information please do not hesitate to contact us.

Anprechperson Portrait

Rubbi Rothenfluh

Operations Manager

+41 58 861 90 82
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