Cosmic Constructions AAC blocks are more competitive than conventional bricks. AAC blocks help in saving overall construction costs. Consistent quality of Cosmic Constructions AAC blocks has brought ample advantages to modern construction. 80% of the volume of an AAC block is air. We manufacture the AAC blocks in a variety of sizes. From lightweight blocks to jumbo blocks to AAC tool kits, we have it all. The raw materials we use to manufacture the AAC blocks are cement, sand, fly ash, gypsum, lime and water.