The white blocks industry dates back to 1929, when the Swedish city of Axoholt witnessed the first production of Cellular concrete products.
Mixing sand granules mixed with lime, cement, and water and aluminum powder. Aluminum powder is a fuel. Hydrogen gas makes a bloating of the mixture with small sporadic air bubbles evenly.
After this phase, the semi-rigid mixture is entered into a specially designed evaporator to evaporate the water vapor at 200 ° C. After drying, the hot air is only present in the pores. No air, water or any contaminants enter at this stage.