Fusion AAC Blocks (Autoclaved Aerated Concrete) is a certified green building material. These blocks are light weight, load-bearing, high-insulating, durable building product produced in a wide range of sizes and strengths. The raw materials used to manufacture these blocks are cement, fly ash, gypsum, lime and water. Fusion AAC blocks manufacturing involves hardening through steam-curing in autoclaves creating calcium silicates, making them stronger. These blocks are manufactured in a variety of sizes. These precast concrete blocks are widely used for internal and external wall construction. Fusion blocks are easy to install, nail, drill and cut for pipes and conduits. Most of the volume of an Fusion AAC block is air making them light weight thermally insulative/fire resistant with good acoustic properties.