We are offering hollow blocks. High compressive strength above 50 kgcm2 ( almost double the strength of conventional bricks) water absorption below 7%. moisture movement less than 0.1% drying shrinkage less than 0.08%. average density 1150 to 1250 kgm3. 100 sq. Ft. = 112.5 nos. Of blocks. 1 sq. Mt. = 12.5 nos. Of blocks.