Compressive strength: The average compressive strength of blocks when tested in accordance with BS: 6717 part-1 1986 shall not be less than 30 N/sq. mm. For every 1000 sq. m. of laid area minimum 6 Nos. blocks shall be tested from a reputed laboratory as suggested by Architect.
Water Absorption: The maximum limit for water absorption shall be as follows:
Bedding: Coarse sand/Aggregate bedding shall have a compacted thickness of 50mm. In conformity with B.S. 7533."