Amazon and Brimstone Collaborate on Lower-Carbon Cement for Concrete Construction

Amazon and Brimstone have collaborated on successful tests of Brimstone's lower-carbon Ordinary Portland Cement (OPC) for use in concrete construction. Amazon has signed a commercial agreement to reserve annual volumes of Brimstone's OPC and supplementary cementitious materials. The companies plan to conduct more extensive testing in 2025 and 2026 to evaluate durability, sulfate resistance, and other key properties. Brimstone's process co-produces multiple industrial materials, including portland cement, at competitive prices and with existing regulation and safety protocols.

Amazon (NASDAQ: AMZN) and Brimstone have successfully completed initial tests of Brimstone's lower-carbon Ordinary Portland Cement (OPC) for use in concrete construction. The collaboration, announced on August 5, 2025, follows promising results from third-party tests that evaluated the workability, compressive strength, and other key properties of Brimstone's concrete materials [1][2][3].

Amazon has signed a commercial agreement to reserve annual volumes of Brimstone's OPC and supplementary cementitious materials (SCM) from its forthcoming plant in Oakland, California. The agreement is a significant step towards scaling up Brimstone's innovative materials across Amazon's buildings portfolio, aiming to reduce the carbon footprint of concrete [1][2][3].

The initial testing outcomes demonstrated that Brimstone's OPC performed in accordance with ASTM C150 requirements and worked comparably well with conventional materials currently used in Amazon buildings. Building on these results, the two companies plan to conduct more extensive concrete tests in 2025 and 2026. These tests will evaluate durability, sulfate resistance, aggregate reactivity potential, and other key properties across a broader range of concrete mix designs and applications [1][2][3].

Brimstone's process co-produces multiple industrial materials, including portland cement, at competitive prices and with existing regulation and safety protocols. The company's OPC utilizes carbon-free calcium silicate rock and magnesium compounds that naturally absorb CO2 instead of limestone, making it carbon negative and offsetting a significant amount of emissions [3].

The collaboration between Amazon and Brimstone underscores the growing demand for low-carbon construction options, particularly in the data center sector. As data centers continue to expand, the need for sustainable building materials becomes increasingly critical. This partnership aligns with Amazon's broader sustainability goals and demonstrates its commitment to reducing its carbon footprint [3].

References:
[1] https://finance.yahoo.com/news/amazon-brimstone-advance-lower-carbon-124800385.html
[2] https://www.businesswire.com/news/home/20250728210392/en/Amazon-and-Brimstone-Advance-Lower-Carbon-Cement-Collaboration
[3] https://www.datacenterdynamics.com/en/news/amazon-partners-with-brimstone-for-supply-of-low-carbon-cement/