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A flexible, foaming, two-part injection resin for sealing cracks in concrete or masonry in wet conditions to form a slightly elastic seal. It has good adhesion to concrete and masonry and when injected into cracks it allows some movement without loss of bond.


  • Low viscosity enables it to penetrate fine cracks and cavities.
  • Reacts with water and forms flexible closed cells. that allow the movement of the crack.
  • Flexible to withstand differential movement.
  • Free expansion: 800%.
  • Chemically resistant to water, weak acids, alkali and micro-organisms.
  • Excellent adhesion to mineral construction materials (such as concrete, cement, brick and mortar) and metal.
  • Reaction speed is controlled by varying the amount of hardener: 6-9% hardener achieves a good cell structure.

General information

Uniclass 2015

Pr_20_31_53_27 Epoxy resin groutsPrimary


C41/620 Resin injection repair of cracks

C42/155 Crack repairs

C42/340 Crack/ void sealing grouts

Specification data - Epoxy resin grouts

Product Reference

Nitofill UR63


Nitokit Surface Sealant

Standard product features




  • Base: 1.08 kg/L.
  • Hardener: 0.947 kg/L.

Viscosity (at 25°C):

  • Base: 105 mPas.
  • Hardener: 8 mPas.

Reaction time:

Reaction time is affected by proportion of hardener and temperature. Reaction times for typical conditions:

  • Start reaction: 12–22 seconds.
  • End reaction: 29–71 seconds.

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