carbon-negative from rock to city block
Brimstone's carbon-negative process is a breakthrough in cement production, making ordinary portland cement with carbon-free calcium silicate rock instead of limestone.
Cement made with The Brimstone Process™ is chemically and physically identical to conventional portland cement, with the same quality and performance builders have trusted for over 150 years. Simply put, our process will turn cement, one of the most intractable climate problems, into a climate solution. It all starts with a new kind of rock.
01 one rock
Cement is conventionally made from carbon-heavy limestone, which releases CO2 when processed. These process emissions are responsible for up to 60% of cement's overall emissions.
We make cement from carbon-free calcium silicate rock, eliminating these process emissions from the start. Calcium silicate rocks are abundant and voluminous at the surface of every continent in the world.