MasterCrete WR 501

Capillary Waterproofing System for Concrete and Mortar Used as a Coating or Dry Shake (formerly MasterSeal 501)

How Does MasterSeal 501 Work?

MasterCrete WR 501, and MasterLife 300D are integral components of Master Builders Solutions crystalline capillary waterproofing system. These products contain special additives that act as catalysts, facilitating the formation of water-insoluble crystalline micro-structures deep within the capillaries and interstices of the cementitious matrix.

MasterCrete WR 501 is the most concentrated form of the surface-applied crystalline waterproofing system, containing the maximum amount of specialised catalysts. This system ensures a complete and permanent solution to water leakage, ingress, or seepage in concrete structures or any cementitious substrate. The system works by forming insoluble crystals within water-bearing capillaries and voids, effectively blocking the passage of water. As it seals pores deep within the concrete, MasterCrete WR 501 does not rely on forming a surface film and remains unaffected by negative hydrostatic pressure. It is equally effective against both positive and negative water pressure, as well as osmotic pressure.
Supplied as a powder and mixed into a slurry with potable water, MasterCrete WR 501 is applied directly to concrete, blockwork, or cement renders in areas where general waterproofing is needed. In powder form, it can also be used as a dry shake on horizontal construction joints.

Recommended Uses:

• Water tanks, reservoirs

• Building basements and foundations

• Swimming pools and water parks

• Sewage and water treatment plants

• Dams, canals, tunnels, harbours

• Retaining walls and sea defence walls

• Concrete pipes

What Are the Unique Features of MasterCrete WR 501?

As the crystalline capillary waterproofing system enables effective pore sealing, it does not rely on film formation on the surface and is not affected by negative hydrostatic pressure. The system is equally effective against positive and negative water pressure or osmotic pressure.

What Are the Benefits of MasterCrete WR 501?

• Imparts integral water tightness – crystal growth blocks pores and path for water ingress

• Protects from waterborne contaminants – stops contamination of concrete with sulphates and chlorides

• Permanently active – crystalline action is reactivated by contact with water

• Approved to AS/NZS 4020:2018 (tested to the maximum exposure level) - suitable for contact with potable water