Brimstone

At Brimstone, we are spearheading a monumental shift in heavy industry, starting with the decarbonization of cement production, an industry responsible for approximately 7.5% of global CO2 emissions. Through groundbreaking technology, we are revolutionizing how the world's most essential building material is made. Our innovative process creates Ordinary Portland Cement that is chemically and physically identical to the material trusted by builders for over 150 years, but without the massive carbon footprint. This breakthrough allows the construction industry to adopt a truly sustainable solution without compromising on quality, performance, or price, effectively eliminating the 'green premium' that often hinders climate-positive adoption.

Our core innovation lies in moving away from limestone, the traditional carbon-heavy feedstock for cement, and instead utilizing globally abundant, carbon-free calcium silicate rocks. The Brimstone Rock Refinery, our proprietary system, processes this rock to co-produce not only carbon-negative cement but also other critical industrial materials like supplementary cementitious materials (SCM) and smelter-grade alumina. This co-production model enhances efficiency and profitability, making our sustainable process economically superior to conventional methods. Founded in 2019 at Caltech, our team of scientists, engineers, and operators is driven by a shared mission to solve one of the planet's most pressing climate challenges. By developing a scalable, cost-effective, and carbon-negative technology, Brimstone is paving the way for a new era of sustainable industrial manufacturing, ensuring that the infrastructure of tomorrow is built on a foundation of climate action.