AAC BLOCK / AAC BRICK Light Weight Bricks (Autoclaved Aerated Concrete Brick) AAC BLOCK, AAC BRICK, CONCRETE BLOCK,Light Weight bricks AAC Block is new wall material, Light Weight,Fire-proof,Sound-proof, Heat-proof... Features1) Autoclaved Aerated Concrete Blocks. Two kinds : Fly-ash block ( In grey color ) Sand block ( In white color ) 2) Grade: a) Intensity A3.5, density B06 b) Intensity A5.0, ...