MasterSeal 505 - Ultra-rapid setting mortar to plug active water leaks in concrete and masonry

How does MasterSeal 505 work?

MasterSeal 505 is a blend of hydraulic cements, well-graded sands and additives supplied in dry powder form. It requires only the addition of clean water to produce a ready-to-use, ultra-rapid setting, plugging mortar. Water flow can be stopped by mixing the MasterSeal 505 to a malleable consistency and using as a plug.

Recommended uses:

MasterSeal 505 is used:

  • For stopping active water or seepage under pressure through joints, cracks and holes in concrete or masonry, where a normal mortar would be washed away and resin would not bond;
  • As a seal for construction joints or floor joints prior to basement tanking with MasterSeal;
  • For sealing cracks and construction joints in reservoirs and other water retaining structures;
  • For instant sewer connections;
  • For rapid anchoring of bolts, conduits, pipes, railings, sanitary equipment, etc.;
  • For joint filling and pointing between concrete segments in concrete and brick tunnels, sewage systems, pipes and mines.

What makes MasterSeal 505 a unique solution?

MasterSeal 505 is an easy to use ultra-rapid setting mortar which sets in typically 30 – 60 seconds to plug active water leaks in concrete and masonry

What are the features and benefits of MasterSeal 505?

  • Rapid setting – Typically 30 - 60 seconds; fast return to service
  • Easy to use – Simply add water
  • Chloride free – No risk to steel reinforcement
  • Non-toxic – Suitable for use in potable water systems
  • Premixed – Giving consistent quality and results

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)