Carbstone
Building Green, Building strong with Carbstone
Our Carbstone blocks are CO2-negative and will continue to absorb CO2 even after production, making them increasingly stronger and harder, resulting in exceptionally sturdy walls. They are made from secondary raw materials (stainless steel slag) and remain 100% recyclable in their next life. Recycling produces only sand and gravel, making future sand and gravel pits redundant. The future starts here!
- CO2-negative
- Cradle-to-Cradle
- High compressive strength

Technology
Our scoop follows years of research, supplemented by external expertise. With our 80 years of experience in masonry blocks, we have developed a product range that transforms the construction sector and sheds its image as a major polluter.
Applications
Every project has its own challenges but must be realized in an environmentally friendly way. That is why we offer various Carbstone building blocks, from masonry blocks to prefab walls, to meet everyone’s requirements.
Realizations
With the launch of Carbstone, we were the first to succeed in offering a circular, CO2-negative, and cement-free alternative to the traditional concrete block on an industrial scale. Discover our most recent projects.
We reduce the CO2 footprint
The future starts here!

CO2-negative
During the production of our Carbstone blocks, more CO2 is absorbed than emitted. Furthermore, they continue to extract CO2 from the air afterwards, locking it away forever.

Cradle-to-cradle
In the production process, upcycled slag is converted into workable material. This makes Carbstone building blocks 100% recyclable, time and time again.

High compressive strength
Because the blocks continue to extract CO2 from the air even after installation, they become harder and harder over time. This results in walls with an exceptionally high load-bearing capacity.

24h curing time
Compared to 3 weeks of curing for traditional, cement-based building blocks.

7 tons less CO2
Per full truckload delivered compared to the same volume of cement-based blocks.

100% recyclable
When the blocks are crushed after demolition, only sand and gravel remain.









