Koster PU Injection

Polyurethane injection resin for active leak sealing.

Koster PU Injection – Advanced Polyurethane Leak Sealing System

Koster PU Injection is a high-performance, single-component polyurethane injection resin designed for sealing active leaks in concrete, masonry, and underground structures. This advanced hydrophilic resin reacts immediately upon contact with water, expanding to fill cracks and voids, creating a permanent watertight seal. Formulated with cutting-edge polymer technology, Koster PU Injection penetrates deep into hairline cracks and wide voids, expanding to ensure complete sealing. Its low viscosity enables excellent penetration into fine cracks, while its fast reaction time stops water ingress instantly. Ideal for emergency leak sealing and structural rehabilitation, Koster PU Injection is suitable for basement walls, tunnels, water tanks, and construction joint repairs. Its durable, flexible seal accommodates structural movement without cracking or losing effectiveness.

Key Features

• ✔ Rapid reaction upon water contact
• ✔ Expands to fill cracks and voids completely
• ✔ Low viscosity for deep penetration
• ✔ Stops active water leaks instantly
• ✔ Durable and flexible seal
• ✔ Compatible with most substrates
• ✔ Long-lasting waterproofing solution

Applications

• Basement wall and floor crack sealing
• Concrete structure leak repair
• Construction joint leak sealing
• Water tank repair
• Underground structure sealing
• Tunnel leak repair
• Manhole and sewer repairs

Technical Specifications

Viscosity	Low – Excellent Crack Penetration
Reaction Time	Seconds on Water Contact
Expansion Ratio	Up to 5:1
Cure Type	Hydrophilic (Water-Activated)
Pack Size	5kg / 20kg / 200kg
Application Temperature	5°C to 40°C

Surface Preparation

1. Identify and mark all cracks and leaking areas.
2. Drill injection holes along the crack pattern.
3. Install injection packers into drilled holes.
4. Clean the area of loose debris and dust.

Application Procedure

Connect the injection pump to the packers and inject Koster PU Injection starting from the lowest point. Inject until resin appears at adjacent holes or until pressure builds. Stop water flow and allow resin to cure. Remove packers after curing and seal injection points.

Storage

Store in a cool, dry place away from direct sunlight and moisture. Shelf life is 12 months in original unopened containers.

Safety Precautions

• Wear protective clothing, gloves, and eyewear during application.
• Avoid contact with eyes and skin.
• Ensure adequate ventilation during application.
• Keep away from children and ignition sources.
• Refer to Material Safety Data Sheet (MSDS) before use.