DIFFERENCE BETWEEN AAC BLOCKS VS RED BRICKS DIFFERENCE AAC BLOCKS RED CLAY BRICKS Raw Materials Cement, Fly ash, Water, & Air Entraining Agents Clay (Alumina), Sand, Lime, Iron Oxide & Magnesia Also Called as Autoclaved Aerated Concrete Blocks Red Bricks, Chamber Bricks, Clay Wire-Cut Bricks, Table Mold Bricks Color Grey Red Weight 4” Blocks 9-9.5 Kg 6” Blocks 12.5-13 Kg 8” Blocks 14-14.5 Kg 3” Bricks 3-3.5 Kg 6” Blocks 4.5-5 Kg Fire Resistance (For 8” Wall) Up to 4 Hours Around 2 hours Water Penetration AAC blocks absorb 10% of water max. By weight, making them ideal for any construction project. Red clay bricks generally absorb a lot of water, ther