Two component and foam forming flexible injection resin on polyurethane base.


Polyinject PU+ is a two-component, solvent free and flexible injection resin on polyurethane base. Polyinject PU+ hardens through reaction of the a and b-component and forms a foam through reaction with water. It is perfectly suited for cracks which are carrying small amounts of water and cannot be stopped or plugged. Due to its low viscosity is recommended for sealing cracks between 0.1 and 10mm and minor cavities to form a flexible and impermeable barrier in reinforced concrete structures in both, dry and damp conditions.


  • 2-component and solvent free
  • Withstands high hydrostatic pressure
  • Foam forming in contact with water
  • Good adhesion to dry and moist substrates
  • Cures to form a permanent and impermeable flexible seal

This TDS is applicable for the United Arab Emirates only. Please contact your local Polybit sales office for the available TDS in your region

Step by Step

Surface preparation

The surface must be stable and free of separating substances. Insufficiently firm layers and concrete slurry must be removed. For this purpose the surface may be prepared by suitable mechanical processes such as e.g. shot blasting, milling or any other suitable mechanical means. Blow the cracks and treated surface with oil free air to ensure complete removal of all dust and loose particles. in the presence of running water the flow must be stopped using Polyinject Stop which produces a rapid setting water-stopping foam. When the water is stopped the cracks are re-injected with Polyinject PU+.

Work preparation

Polyinject PU+ is be applied as injection resin using injection packers and 1- or 2-c pumps. The injection packers may be fixed into holes drilled Flexible 2-component foam forming polyurethane injection resin directly into the crack+C23 or drilled diagonally from concrete adjacent to the crack or by the fixing of injection nipples. For further assistance and instructions regarding the packer fixing and design please refer to our method Statement.


Pour the hardener (component b) into the resin (component a) in the indicated mixing ratio (3:1 by volume) and mixed with an electrical mixer (max. 300 rpm) until a homogenous mixture is produced. Assure that the B component is evenly dispersed. Only mix sufficient resin that can be used within the pot life of the material.


POLYINJECT PU+ can be injected with using 1-component or 2-component injection pumps. The injection pressure should be at least 4 bar. After the work is finished the injection system shall be allowed to cure for 24 hours and shall be left undisturbed for this time.