Celcon Block Standard Grade is BBA certified and has a compressive strength of 3.6N/mm2. Its all-round performance allows a 100mm Standard Grade Celcon Block to be used consistently throughout a build, eliminating on-site confusion. 100mm Standard block suitable for use is internal & external cavity walls, solid walls, separating walls, partitions, flanking walls, multi-storey buildings, foundations and beam & block floors.