Our water repellent concrete masonry units are manufactured with the MasterPel 240 (formerly Rheopel Plus) water-repellent admixture system. Specially formulated for the manufacture of concrete masonry units, the admixture is integrally mixed into CMUs during manufacturing. MasterPel 240 is in compliance with ASTM E514.

Note: Because water repellent blocks will not absorb any free water, the use of self-consolidating grout or a water reducer is strongly recommended.

The MasterPel 240 System is able to improve the quality, value, and overall aesthetics of concrete masonry construction through its several inherent benefits:

• Optimizes overall water-repellent properties
• Maintains excellent wind-driven rain resistance
• Provides lasting protection from moisture damage without the use of exterior post-applied sealers
• Enhances color intensity and uniformity
• Reduces the potential for efflorescence
• Improves the texture and consistency of manufactured concrete products
• Increases the coverage rate of post-applied paints and coatings

MasterPel 240 is also available as an additive for masonry mortar mixes. Please visit our Accessories page for more information about MasterPel 240MA.