MasterSeal 501/502 - Deep penetrative, reactive, capillary waterproofing system for concrete and mortar


How does MasterSeal 501/502 work?

MasterSeal 501 and MasterSeal 502 are components of BASF’s crystalline capillary waterproofing system. These products contain specialist additives that play the role of the catalyst in the formation of water-insoluble crystalline micro-structures deep within the capillaries and interstices of cementitious matrix of concrete and mortars. 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 the negative hydrostatic pressure. The system is equally effective against positive and negative water pressure or osmotic pressure.

MasterSeal 501 is the most concentrated form\ within the BASF crystalline waterproofing system and contains the maximum amount of specialist catalysts. MasterSeal 501 can be used as a coating, dry shake or as an additive in the concrete or mortar mix.

MasterSeal 502 is a crystalline re-profiling render, which can be used in conjunction with MasterSeal 501 for patch repairs and as render on old concrete surface.

Recommended uses:

MasterSeal 501 and MasterSeal 502 are used for:

• Water tanks, reservoirs

• Building basements and foundations

• Swimming pools and water parks

• Sewage and water treatment plants

• Dams, canals, tunnels, harbors

• Retaining walls and sea defense walls

• Concrete pipes

What makes MasterSeal 501/502 a unique solution?

MasterSeal 501/502 is deep penetrative, reactive, capillary waterproofing system for making concrete and mortar watertight

What are the features and benefits of MasterSeal 501/502?

Imparts integral water tightness to structures.

Protects from waterborne corrosive agents.

Permanently active – Crystalline action is reactivated by contact with water.

Non-toxic and non-tainting – Suitable for use in potable water systems.

MasterSeal 501/502

Components of BASF’s crystalline capillary waterproofing system

MasterSeal 505

Blend of hydraulic cements, well-graded sands and additives supplied in dry powder form

MasterSeal 550

Acrylic-modified, Portland cement-based flexible, waterproofing membrane for concrete and masonry

MasterSeal 910

Suitable for all construction joints subject to hydrostatic pressure, on one or both sides

MasterSeal 912

One component, moisture curing pre-polymer which is reswellable when in contact with water

MasterSeal HLM 5000

One-component, moisture-curing, bitumen-modified polyurethane elastomeric waterproofing membrane for exterior below-grade or between-slab applications


MasterSeal 122 BK neutral SDS

pdf (83.79 Kb)

MasterSeal 123NS White SDS

pdf (78.45 Kb)

MasterSeal 473 RC Off White SDS

pdf (96.56 Kb)

MasterSeal 501/502: Technical Data Sheet (ref. MasterSeal 501/502/01/0313)

pdf (232.27 Kb)

MasterSeal 505 SDS

pdf (111.14 Kb)