US: Amazon and Brimstone have announced successful third-party test results for Brimstone’s lower-CO₂ ordinary Portland cement (OPC), which meets ASTM C150 requirements using Amazon slab mix designs. The companies will continue testing through 2025 and 2026. On the basis of the successful tests, Amazon has signed a commercial agreement to reserve annual volumes of OPC and supplementary cementitious materials from Brimstone’s upcoming plant in Oakland, California.
