Nitofill PU150: Multi-purpose Hydrophilic Polyurethane Injection Resin

Product Description

Nitofill PU150 is a multi-purpose hydrophilic polyurethane injection resin engineered to seal leaking cracks, voids, and fractures in concrete structures. As a single-component system, it reacts with water to form an expanding foam that fills voids and creates a tight, impermeable elastomeric seal, effectively stopping water flow and preventing infiltration.

The product is supplied in 20kg containers and maintains a shelf life of 12 months from the date of manufacture when stored in the original, unopened packaging under dry conditions.

Key Technical Specifications

Physical Properties

Property	Value	Standard
Specific Gravity	1.07	ASTM D-1475
Viscosity	650 cps	ASTM D-1638
Colour	Pale yellow resin	—
Tensile Strength	1.17 MPa	ASTM D-638
Elongation	400%	ASTM D-638

Reaction Characteristics

When mixed with equal parts water (w:w) at 25°C, Nitofill PU150 demonstrates the following reaction profile:

• Cream Time: 29 seconds
• Gel Time: 3 minutes 5 seconds

Reaction times vary with temperature, ranging from extended times at 10°C (110 seconds cream time) to accelerated reactions at 30°C (26 seconds cream time).

Key Advantages

Nitofill PU150 offers numerous performance benefits:

• High tensile adhesion to most surfaces
• Expands up to 25 times initial volume, ensuring complete void filling
• Solvent-free and environmentally safe formulation
• Excellent adhesion to concrete, brick, and mortar
• Resistant to most organic solvents, mild acids, and alkalis
• Rapidly forms a highly resilient flexible seal allowing movement accommodation
• Reacts with seawater or mineral water, providing versatility in various conditions
• Complies with AS/NZS 4020:2018, suitable for drinking water applications

Standards Compliance

Nitofill PU150 complies with:

• AS 4020-2018 (Australian Standard for materials in contact with drinking water)
• AWQC Report 350774

Typical Applications

Primary Uses

Nitofill PU150 is designed for multiple sealing and injection applications:

• Sealing against water ingress in concrete structures
• Sealing against leaking cracks and joints
• Sealing against water in masonry and brickwork
• Void filling in generally inaccessible locations
• Back grouting applications for structural support

Application Methods

Injection Techniques

Nitofill PU150 can be applied by two primary methods:

1. Single Component Pump – High-pressure equipment allows the resin to react with water naturally present in the structure
2. Twin Piston Pump – Enables variable water-to-resin ratios to form different density foams as required by project conditions

Equipment Requirements

High-pressure packers and couplers are essential for reliable application:

• Nitofill Steel Packer 10mm x 95mm or 13mm x 100mm – inserted into pre-drilled holes
• Nitofill Coupler 4 Jaw – provides quick connection with positive shut-off via grease nipple valve
• The coupler allows pumping hose to connect and disconnect quickly, with high pressure enabling reliable application

Installation Procedure

The application process follows these key steps:

1. Drill holes at 45° angle to intersect the crack approximately halfway through concrete thickness
2. Install injection packers at intervals along crack length (spacing depends on crack width and depth)
3. Pump Nitofill PU150 slowly until resin appears on the crack face
4. Start at the lowest point and work upwards
5. For dry cracks without active moisture, pre-flush with water to provide moisture for polyurethane reaction

Chemical Composition & Environmental Safety

Solvent-Free Formula

Nitofill PU150 contains:

• No TDI (Toluene Diisocyanate)
• No solvents
• Hydrophilic polyurethane base chemistry

This composition contributes to the product's environmental safety and user-friendliness, making it suitable for applications requiring minimal environmental impact.

Drinking Water Compliance

As a hydrophilic formulation that complies with AS/NZS 4020:2018, Nitofill PU150 is approved for use in systems and structures containing potable water.

Foam Formation & Properties

Reaction Mechanism

When Nitofill PU150 contacts water, it undergoes a chemical reaction that:

1. Initiates foam expansion through hydrophilic properties
2. Creates flexible polyurethane foam with varying density based on water ratios
3. Forms an impermeable elastomeric seal resistant to water infiltration
4. Develops chemical resistance in the cured foam state

Foam Characteristics

The resulting polyurethane foam is:

• Flexible and resilient – accommodates movement in cracks and joints
• Hydrophilic – water-resistant once cured
• Chemically resistant – resistant to organic solvents, mild acids, and alkalis
• Highly adhesive – bonds firmly to concrete, brick, and mortar surfaces

Design Criteria for Application

Temperature Considerations

Reaction times are temperature-dependent:

• At 10°C: Slower reaction (110 seconds to cream)
• At 20°C: Moderate reaction (55 seconds to cream)
• At 25°C: Standard reaction (29 seconds to cream)
• At 30°C: Accelerated reaction (26 seconds to cream)

Important Note: Careful consideration should be given to applications below 10°C on a falling thermometer to avoid possible crystallization.

Accelerator Options

Nitofill Accelerator can be optionally added (2-5% by weight) to adjust reaction profiles for specific job site conditions, allowing variable cream times and gel times as needed.

Product Conditioning & Safety

Pre-Application Requirements

• Condition material to appropriate temperatures for at least 12 hours prior to application
• Keep containers sealed when not in use to prevent atmospheric moisture absorption
• Store in dry conditions in original unopened packaging

Cleaning & Maintenance

• Nitofill PU150 should be removed from tools, equipment, and mixers immediately after use with Fosroc Solvent 10
• Cured material can only be removed mechanically

Supply Format & Specifications

Specification	Details
Pack Size	20kg containers
Shelf Life	12 months from manufacture date
Storage	Dry store, original unopened packaging
Supply Code	FC300900-20KG

References

• [1] Fosroc_Nitofill_PU150_TDS.pdf
• [4] Fosroc_Nitofill_Injection_Packers_TDS.pdf
• [6] Fosroc_Nitofill_Accelerator_TDS.pdf