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Home / Products / PU-Inject 400

★ FEATURED

PU-Inject 400

Fast-curing polyurethane resin for sealing active leaks under hydrostatic pressure.

Hydrostatic PressureFast Cure (90s)Active LeaksEuropean Certified
Cure Time90 sec
Packaging5 / 25 L
Shelf Life12 months
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↓ Download Datasheet (PDF)

Overview

Engineered to stop leaks under live water pressure.

PU-Inject 400 is a single-component, hydrophobic polyurethane injection resin developed for sealing active water leaks in concrete structures under hydrostatic pressure. On contact with moisture it reacts rapidly to form a flexible, closed-cell foam that bonds to the substrate, sealing the leak path in seconds.

Used by Ofixotech crews across 200+ projects to stop infiltration in basements, tunnels, lift pits, retaining walls, and below-ground tanks. Compatible with our full waterproofing-system warranty.

Key Features

  • Reacts on contact with water – no curing delays
  • Penetrates fine cracks (< 0.2 mm)
  • Seals under 30 bar hydrostatic pressure
  • Permanently flexible – survives structural movement
  • Solvent-free, low odour – safe for occupied buildings
  • European-certified (CE / WRAS-compatible)

Technical Specs

Technical Specifications

All values measured at 23°C unless noted. Full test data available in the datasheet.

PropertyValueUnit
FormSingle-component liquid–
ColourAmber / honey–
Density1.10 ± 0.05g/cm³
Viscosity350 ± 50mPa·s
Reaction time (water)30–90seconds
Foam expansion ratioUp to 40×vol
Tensile strength0.55N/mm²
Elongation at break≥ 250%
Service temperature−30 to +80°C
Application temperature+5 to +40°C
Hydrostatic resistanceUp to 30bar
Shelf life (sealed)12 months–
Packaging5 L can · 25 L drum–
Standards / certsCE 1504-5 · ISO 9001–

Applications

Where this product is used

Six typical site applications where our crews specify this product.

🏗️

Basement walls

Sealing live water ingress through cracks, cold joints, and tie-rod holes.

🚇

Tunnels & shafts

Stopping infiltration in metro, utility, and infrastructure tunnels under groundwater pressure.

⬇️

Lift pits

Permanently sealing leaks below the lowest occupied level where conventional repairs fail.

🧱

Retaining walls

Crack injection in basement retaining walls and soldier-pile shoring systems.

💧

Below-ground tanks

Sealing leaks in water tanks, sewage treatment, and storm-water retention chambers.

🔌

Pipe penetrations

Annular gap sealing around service penetrations through external walls and slabs.

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