Prometheus Materials produces a bio-cement based concrete alternative formed from microalgae-derived calcium carbonate combined with aggregates to create masonry and precast elements. The product is designed to replace Portland cement in concrete applications including blocks and panels. Performance is described as meeting conventional concrete standards, although specific mechanical values are not published on the webpage. Products are intended for structural and non-structural applications and compatible with standard construction practices. Manufacturing is based on controlled biological growth of cementitious material. The company operates in the United States. No Environmental Product Declaration is published on the website.