LP-Inject PU 800
Hydrophobic Polyurethane Chemical Injection Resin
Expansion Ratio: Up to 30x |
Viscosity: 200 - 350 mPa·s |
Standards: EN 1504-5 / ASTM D2849|
LP-Inject PU 800 is a premium single-component, solvent-free hydrophobic polyurethane chemical injection resin designed for heavy-duty leak sealing in concrete cracks, expansion joints, and honeycomb structures. Upon contact with water, it rapidly reacts and expands up to 30 times its original volume to form a tough, rigid closed-cell foam that completely stops high-pressure water ingress.
Key Performance Features
High Hydrophobic Expansion (30x)
Reacts vigorously with water to expand up to 3000%, penetrating deep into structural voids and micro-cracks to form a dense, watertight seal.
Low Viscosity Penetration
Ultra-low viscosity (200–350 mPa·s) enables deep injection into tight hair-line dynamic cracks without requiring high pump line pressures.
Closed-Cell Rigid Foam Structure
Forms a chemically stable, non-shrink, closed-cell rigid foam matrix that resists permanent hydrostatic pressure and aggressive groundwater chemicals.
Controlled Reaction Speed
Reaction time can be easily adjusted using LP-Cat accelerator to match various water flow volumes and ambient site temperatures.
Technical Specifications
| Physical Property | Technical Value | Test Standard |
|---|---|---|
| Chemical Base | Single-Component Polyurethane Prepolymer | Internal Standard |
| Viscosity (25°C) | 200 – 350 mPa·s | ASTM D2196 |
| Density (25°C) | 1.05 – 1.15 g/cm³ | ASTM D1475 |
| Expansion Ratio | 20x – 30x (free expansion) | Internal Standard |
| Induction Time (with 5% Catalyst) | 10 – 20 Seconds | Internal Standard |
| Full Foaming Time | 60 – 120 Seconds | Internal Standard |
| Structure of Cured Foam | Closed-Cell Rigid Foam | Visual / Microscopic |
| Corrosiveness | Non-corrosive to Steel & Concrete | EN 1504-5 |
| Service Temperature | -30°C to +80°C | Internal Standard |
Applications & Substrates
Primary Applications
High-Pressure Water Leak Stopping in Basements & Underground Vaults
Tunnels, Subways, Culverts & Civil Infrastructure Sealing
Concrete Cold Joints, Construction Joints & Crack Repair
Water Treatment Tanks, Dams & Hydraulic Structures
Void Filling Behind Concrete Linings
Compatible Substrates
Structural Reinforced Concrete |
Precast Concrete Segments |
Masonry Foundations |
Rock & Underground Strata
Application & Surface Prep Guide
Drilling & Packer Installation
Drill injection holes at a 45° angle towards the crack, intersecting the crack midpoint. Insert mechanical high-pressure injection packers and tighten securely.
Flushing & Preparation
Flush cracks with clean water if necessary to test crack connectivity and provide moisture required for resin reaction.
Resin Mixing & Injection Pump Setup
Mix LP-Inject PU 800 with the appropriate percentage of LP-Cat accelerator (1% - 10% based on required speed). Pour mixture into a single-component high-pressure injection pump.
High-Pressure Grouting
Inject LP-Inject PU 800 systematically from lower packers to upper ones until resin/foam exudation is observed at adjacent ports. Allow to expand and seal.
Packer Removal & Crack Finishing
After complete cure, remove injection packers and seal the drill holes using LP-Plug Mortar 100 for a flush, watertight finish.
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