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BuildGrout PU Flex

A single-component, MDI-based flexible polyurethane injection resin for sealing active water leaks in concrete structures. BuildGrout PU Flex reacts with water to expand and form a flexible, closed-cell foam that permanently seals cracks and joints against water ingress.

Packaging

5 kg tin, 20 kg drum

Coverage

Depends on crack volume and water flow — consult technical team

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Features

  • Reacts with water — ideal for active leaks under pressure
  • Expansion ratio up to 20 times original volume (in presence of water)
  • Flexible foam accommodates structural movement
  • Excellent adhesion to wet concrete surfaces
  • Chemical resistance to alkaline groundwater
  • Injection at pressures from 20 to 200 bar

Technical Specifications

Density1.10 ± 0.02 g/cm³ (liquid)
Foam TypeFlexible, closed-cell
Viscosity150 – 300 mPa·s at 25 °C
Expansion Ratio10 – 20 times (depending on water contact)
Elongation at Break> 300%
Reaction with WaterImmediate foaming
Service Temperature-30 °C to +80 °C
Tensile Strength (foam)> 0.3 MPa

Application Areas

Sealing active water leaks in basements and tunnelsEmergency leak sealing in underground structuresSealing construction joints and pipe penetrationsCurtain grouting behind retaining wallsSealing of leaking manholes and utility vaultsSoil stabilization in saturated conditions

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