ASTM C90 specifies the following tests for load-bearing concrete masonry units for TRENDSTONE ground face masonry units Compressive Strength and Moisture Absorbency A test to ensure that blocks meet strength and moisture requirements, and are free of cracks and other defects. Complies ASTM C1262 specifies the following tests for TRENDSTONE masonry units Freeze/Thaw Test A test to ensure that the finished facing does not crack or craze when exposed repeatedly to freeze thaw cycles Complies