"“Hitech Blocks” are high quality building material that combines strength, ease of use, cost effectiveness and eco-friendliness to offer the most reliable alternative to traditional construction material. “Hitech Blocks” is a steam cured mix of pulverized fly-ash, cement, lime and aeration agent. The high pressure steam curing in autoclaves achieves the desired physical and chemical stability that has had average density which is 1/5th of a normal concrete block and 1/4th of a clay brick. Hitech block consists of 80% air by volume making it the lightest available walling material."