MasterSeal 621 – A high build bitumen / rubber latex emulsion

How does MasterSeal 621 work?

MasterSeal 621 is a brown rubber/bitumen liquid emulsion with excellent adhesion which dries to a tough black seamless, flexible damp-proof and vapour-proof membrane.

What are MasterSeal 621 typical applications?

  • Tanking and damp-proofing structures: to provide an impervious damp-proof membrane on concrete and brick.
  • Floors: to provide a sandwich membrane in new construction or a surface treatment.
  • Walls: for interior and exterior walls.
  • Roofs: for the maintenance of many types of roofs including built-up felt, asphalt, lead, zinc, aluminium, concrete, lightweight screeds timber, slate, asbestos cement, corrugated iron, and as a vapour barrier.
  • As an adhesive: for bonding wood blocks and wood mosaics, insulation board, expanded polystyrene and cork tiles and to provide a key for plastering.

Product information

Technical Data Sheet

Specification Clause

Regional Contacts



Job References - MasterSeal 621

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MasterSeal 621_Spec

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MasterSeal 621_TDS

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