LeakInject Flex 6890

LeakInject 6890 is a medium viscosity, one component MDI-based polyurethane injection resin that swells in contact with water to form a flexible foam that does not shrink.


  • Penetrates deep into cracks and joints
  • Reacts with water to form a flexible, closed cell foam that allows movement of the crack or joint
  • Free expansion: 800% - 1100%
  • No shrinkage
  • Chemically resistant against water, weak acids, alkalis and micro-organisms
  • Excellent adhesion to mineral construction materials (such as concrete, cement, brick, mortar), metal and certain plastics
  • Reaction speed is controlled by varying the amount of catalyst used in the mix


  • Water sealing of cracks and joints
  • Walls
  • Floors
  • Concrete Construction
  • Sewers
  • Tunnels
  • Buried Rail
  • Any Buried Construction where Water Ingress is not Desirable