Clinker and thin brick consist predominantly of clay and loam. The geological origin of the raw material influences the subsequent colour of the fired clinker. Depending on the nature of the starting material, sand is additionally added during preparation. Brick fragments are also reintroduced into the production process.

Clay and loam are the essential raw materials for the production of our clinkers. The shale clays we use are extracted in northern Germany at depths of up to six meters. Regional extraction enables short transport routes to the plant. After the completion of extraction, the areas are renaturalized in close coordination with the responsible authorities. The development of diverse habitats for plants and animals also plays an important role in this process.

Clinker bricks do not require flame retardants. Firing at approximately 1,100 °C creates a ceramic, non-combustible building material. thin brick can be a component of façade constructions with high fire protection requirements when used in conjunction with mineral external thermal insulation composite systems.

Clinker and thin brick are fired at approximately 1,100 °C. This process creates a dense and resilient ceramic building material that absorbs only a small amount of water. The water absorption of Feldhaus products is typically between two and five percent. In conjunction with a professionally executed joint, a clinker or thin brick façade provides lasting protection against weather and moisture.

Politics and our society are increasingly relying on natural building materials. Manufacturers such as Feldhaus Klinker have been conducting their own monitoring of technical product quality for many years. In addition, measurements are carried out by external laboratories. However, building certifications are becoming increasingly important, as they assess the interaction of the various construction products and their impact on the environment and express it in figures. An important basis for this is an EPD (Environmental Product Declaration).

The EPD demonstrates the environmental impact of a product throughout its entire life cycle.

The EPD is a list of environmental impact indicators for a specific building material, in this case clinker, thin brick and Pavers. This data is presented in a standardized manner. This significantly facilitates the comparison of different materials. It thus makes it possible to understand the performance a product delivers during the various phases of its life cycle. From raw material extraction through the manufacturing process, use, and finally recycling.

Clinker has been used for centuries as a durable building material for facades. Numerous historic brick buildings demonstrate that ceramic building materials can achieve very long periods of use. A long service life can reduce the need for replacement and new building materials and is therefore an important factor when considering the entire life cycle of a facade.

We have been producing thin brick in the required thickness directly since the early 1980s. They are not subsequently cut from a complete clinker brick. As a result, only the amount of material required for the thin brick is used. Since 2001, we have also been producing corner thin bricks directly in their final thickness and shape. This allows thin bricks and corners to be created specifically for their use on durable and low-maintenance facades in new builds and existing properties.

The production of ceramic building materials requires energy, particularly for the firing process. Feldhaus therefore invests in the gradual reduction of the associated CO₂ emissions. A photovoltaic system with an output of over 10 MWp was installed on the approximately seven-hectare hall roofs at the Bad Laer site. In addition, our kilns can use natural gas with a hydrogen content of up to 30 percent. Further measures focus on the expansion of renewable energies and the further development of the energy supply for our production.