About Us

When two rivals, both specialists in allied technologies, come together, it can become a success story. We have been writing this story since our establishment in 1977, when the business family Wüseke and the business family Hölscher founded CALSITHERM.

Since then, we have been pleased by the constantly positive development of our enterprise and our companies. We are your reliable partner in high-temperature insulation, fire protection and internal insulation. Over the years, we have made a good name for ourselves - even worldwide, in some applications.

Our products have earned a place in many buildings. Here are some of the highlights, which you may be aware of:

  • Olympic stadium, Kiev
  • Kunsthalle (Art Gallery), Mannheim
  • Remise at Savignyplatz, Berlin
  • Elbphilharmonie (concert hall), Hamburg
  • Rijksmuseum, Amsterdam
  • Solidarnosc Museum, Danzig

Besides our products, you can expect from us a first-class service when it comes to technical questions and product developments. This service includes consulting, engineering as well as complete, all-round services for installation of refractory equipment.

CALSITHERM Silikatbaustoffe GmbH is a member of CALSITHERM Group.


Profit from our know-how. Our customer-oriented expert knowledge is often the basis for trend-setting applications in your industrial operations or for your building restoration. You will receive structural and thermal engineering optimisation as well as CAD documentation from us in a custom, comprehensive package.


Quality that proves convincing in the long term requires the systematic cooperation of all involved in the process of development, production, sales and application. In collaboration with our distribution company SILCA, we develop high-performance products and systems that are guaranteed to meet your requirements. And you are welcome to be demanding.


Modern computer-controlled processing machines guarantee a very high level of quality. Installation, flexibility, reliability and timely delivery of products and services provide the basis of our success.

Quality Assurance

The certification according to the new DIN EN ISO 9001:2015 standard guarantees our reliability as your business partner.

Energy Audit

Through the yearly audit that takes place in accordance with DIN EN 16247-1 we ensure that our processes flow as energy-efficient as possible. This not only protects the environment, but also saves costs.

Environmental Product Declaration (EPD)

Our calcium silicate materials have been classified according to Type III of the Environmental Product Declaration (EPD) by independent experts. The EPD is based on internally agreed on ISO standards (ISO 14025 and EN 15804). It provides the ecologically relevant basis for data for presenting the environmental properties of a product, both for industrial applications and building assessments.

CE Marking

With the exception of some of the special products, CALSITHERM produces calcium silicate materials in accordance with the DIN EN 14306 standard. The products that are not regulated in the standard are covered through approvals. Through third-party monitoring, assessment and verification of the constancy of performance is carried out continuously according to System 1.

  • Internal insulation and mould prevention
  • Industrial furnaces and furnace construction
  • Machinery and Plant construction
  • Thermal plant engineering
  • Domestic fireplaces and chimneys
  • Construction of fireplaces and tiled stoves
  • Thermal treatment systems
  • Steel and iron foundries
  • Aluminium and non-ferrous metal foundries
  • Glass and ceramic industry
  • Fire protection in shipbuilding and building construction
  • Insulation material in dampers, doors and cabinets

CALSITHERM all over the world



SILCA Service- und Vertriebsges. für Dämmstoffe mbH
Auf dem Hüls 6
40822 Mettmann


Calsitherm Silikatbaustoffe GmbH
Hermann-Löns-Straße 170
33104 Paderborn


redstone GmbH & Co. KG
Haferwende 1
28357 Bremen


SRS Amsterdam B.V.
Dusartstraat 23-hs
1072 HM Amsterdam

Great Britain

International Syalons (Newcastle) Ltd.
Stephenson Street, Willington Quay
Wallsend, Tyne & Wear
England, UK
NE28 6TT


SILCA Italia srl
Via Mattei 5/11
30037 Scorze (VE)

USA (strategischer Partner)

Industrial Products International Inc.
1655 West Yale Ave
80110 Englewood, Colorado


Edificio 3 - Col. Valle de Oro
San Juan del Rio, Querétaro

Brasil (strategic Partner)

Alfa Trend Ind. e Com. Ltda
Rua Macassit, 555
13347-190 Indaiatuba - SP

South Africa

SILCA South Africa (pty) Ltd.
9 Minerva Avenue
1609 Dowerglen


SILCA Insulation (SEA) SDN. BHD.
8-1A, Jalan 8/125D
57100 Kuala Lumpur