Undisclosed · Other round · Cleantech · Berlin, Germany
Berlin-based Kalz has secured an undisclosed investment from IBB Ventures through the investor's B# pre-seed programme. The company says the backing will support a planned Berlin facility that mineralises industrial CO2 into lower-emission building materials, with operations scheduled to begin later in 2026. The financing amount was not disclosed.
The new investment follows €1.3m in public funding that Kalz previously received through Germany's VIP+ validation programme. That earlier support funded work with Technische Universität Berlin to validate and develop the underlying process; it is separate from the current round.
From research validation to industrial production
Kalz's process reacts CO2-rich industrial exhaust gas with mineral residues such as slag and waste-incineration ash. According to the company, the reaction binds the carbon as stable carbonate while upgrading residues into materials that can replace some emission-intensive inputs in cement and concrete. Kalz is initially focusing on supplementary cementitious materials, alongside aggregates and fillers.
That combination gives the business two potential sources of value: helping industrial operators manage captured CO2 and residues, and supplying cement producers with alternative mineral inputs. Moving from a validated process to a production plant is therefore more than a capacity step. Kalz will need to show that variable industrial feedstocks can yield material with consistent properties, and that customers can qualify it for repeatable use in concrete products.
The funding is intended to take that test into an industrial setting. Kalz describes the planned site as one of Europe's largest CO2 mineralisation and production plants of its kind, but the milestone remains prospective until it is commissioned and operating. The next evidence will be plant delivery, reliable output and adoption by building-material customers.
Kalz was founded by scientists Till Strunge, Dario Kremer and Jason Collis after research on CO2 mineralisation. IBB Ventures says the appeal lies in a model that combines permanent carbon storage, the upgrading of industrial residues and access to the building-materials market. Its B# vehicle typically invests €100,000 to €400,000, but neither Kalz nor IBB Ventures disclosed the size of this transaction.
Sources checked:
Kalz company announcement · IBB Ventures announcement · Kalz technology overview · Tech.eu Funding Explorer
