MAXBRIC™ & MAXBLOC™ units exceed the requirements of ASTM-C90 for compression strength and absorption. The product mix design and materials provide the highest quality and are used to resist fading from ultraviolet light and attack by acidic substances. Water repellents are used in the manufacture of MAXBRIC™ & MAXBLOCK™. The same water repellant admixture used in the block is recommended in the mortar to ensure compatibility and bond. Surface sealers are recommended for all types of architectural concrete masonry to assure excellent wall performance.