Quick Reference Values
standard modular sizes190 x 90 x 90 mm and 190 x 90 x 40 mm
maximum water absorption15 percent by weight
maximum efflorescenceSlight
maximum warpage2.5 mm
minimum compressive strength7.5 N/mm2 (typically specified higher depending on class)
Practical Notes
Since facing bricks remain unplastered, visual inspection for uniform color, sharp edges, and absence of cracks or chips is just as critical as strength testing.
Strict efflorescence testing is required because salt deposits will permanently degrade the aesthetic value of the exposed facade.
Ensure proper handling and stacking at the site to prevent damage to the clean edges of facing bricks.