Sublime Systems

Born from MIT in 2020, two experts in materials and electrochemistry spun out a bold idea: make cement without kilns or CO₂ emissions.

Their electro

chemical refinery for rocks turns low

value feedstocks into cement plus valuable co

products like magnesium and aluminum.

The result is a cleaner, more durable, lighter cement that rivals and often exceeds OPC in durability and consistency.

Backed by Holcim and Siam Cement Group, they’re positioned to industrialize a true

zero solution that could decarbonize a major global industry.

Electrified cement manufacturing process eliminates fossil fuels and limestone, delivering a >90% reduction in global warming potential compared to ordinary Portland cement (72 kg CO₂/tonne vs. 922 kg CO₂/tonne).

Cradle

to

gate life cycle assessment conducted per ISO 21930 confirms major reductions in acidification and eutrophication without increasing water use.

Developed 'true

zero' process that avoids both mineral and fossil

fuel emissions, relying solely on clean electricity and carbon

free inputs.

First commercial plant in Holyoke, MA projected to open in 2026 with 30,000 tons

per

year capacity, scaling to cost and scale parity with traditional cement.

Pilot facility (Somerville, MA) running at >250 TPY capacity and shipping low‑carbon cement to early customer projects (e.g., One Boston Wharf net‑zero building).