German climatetech startup Co-reactive has completed a โฌ6.5 million seed financing round led by HTGF, with participation from NRW.Bank, HBG Ventures, AFI Ventures, Evercurious VC, and a group of experienced climate-tech business angels.
Technology
Founded in 2024, Co-reactive develops a continuous COโ mineralization process that converts captured COโ and natural minerals, such as olivine or metallurgical slags (EAF & BOF), into COโ-negative supplementary cementitious materials (SCMs). These materials enable a reduction in clinker content and associated emissions while maintaining or improving compressive strength and durability. The technology is designed as a drop-in solution that can be integrated into existing cement and construction material production processes.
Goals
With the seed financing, Co-reactive plans to scale its laboratory and pilot activities to a continuous demonstration plant with a capacity of approximately 1,000 tons per year by Q2 2026. In parallel, the company is working with industrial partners to prepare first-of-a-kind plants at the tens-of-thousands-of-tons scale, which from 2027 onward are intended to mineralize biogenic or process-related COโ streams directly at cement and steel production sites.
Co-reactive addresses key challenges in the cement industry, including the high emissions intensity of cement production (responsible for around eight percent of global COโ emissions), and the increasing Raritร of conventional cement substitutes due to the coal phase-out and structural changes in the steel industry.
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