Nitofill PU150: Multi-Purpose Hydrophilic Polyurethane Injection Grout

Overview

Nitofill PU150 is a multi-purpose hydrophilic polyurethane injection resin specifically engineered for sealing and repairing concrete and masonry structures. As a single-component system, it reacts with available water to initiate expansion and create an elastomeric seal that effectively stops water infiltration in cracked or damaged concrete.

Primary Uses and Applications

Nitofill PU150 is designed for a diverse range of applications in concrete repair and waterproofing:

• Sealing against water ingress in concrete structures
• Sealing leaking cracks and joints in concrete and masonry
• Sealing against water in masonry and brickwork
• Void filling in generally inaccessible locations
• Back grouting to seal spaces behind structural elements
• Drinking water applications (complies with AS/NZS 4020:2018)

Key Technical Properties

Physical Characteristics

Property	Specification
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 Nitofill PU150 is mixed with equal parts water (w:w) at 25°C:

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

The product expands up to 25 times its initial volume, filling voids and creating a tight, impermeable elastomeric seal.

Material Composition and Environmental Safety

Nitofill PU150 is formulated as a solvent-free, hydrophilic polyurethane system containing:

• No TDI (Toluene Diisocyanate)
• No solvents
• No harmful chemical components

This composition makes it environmentally safe and user-friendly for various applications. The material is resistant to most organic solvents, mild acids, and alkalis.

Standards Compliance

Nitofill PU150 demonstrates compliance with important regulatory standards:

• AS 4020-2018: Certification for drinking water applications
• AWQC Report 350774: Third-party validation of product performance

Key Advantages

Nitofill PU150 offers multiple performance benefits for concrete repair applications:

• High tensile adhesion to concrete, brick, mortar, and most surfaces
• Significant expansion capability (up to 25 times original volume)
• Flexible elastomeric seal that accommodates crack movement
• Rapid reaction with water and mineral water
• Solvent-free formulation ensuring environmental safety
• Reactive versatility: Reacts even with seawater or mineral water
• Suitable for drinking water applications under AS/NZS 4020:2018 compliance

Application Methods

Injection Techniques

Nitofill PU150 can be applied using two primary methods:

1. Single Component Pump Method

• Equipped for high pressure
• Resin reacts with water present in the concrete structure
• Foam forms automatically upon water contact

2. Twin Piston Pump Method

• Allows variation of water/resin ratio
• Enables formation of different density foams
• Provides greater control over expansion characteristics

Injection System Requirements

Application utilizes Nitofill Steel Packers specifically designed for reliable polyurethane injection:

• Nitofill Steel Packer 10mm x 95mm
• Nitofill Steel Packer 13mm x 100mm
• Connected to Nitofill Coupler 4 Jaw

High-pressure packers enable reliable application with positive shut-off capability.

Application Procedure

• Drill holes at 45° angles to intersect cracks approximately halfway through concrete thickness
• Position injection packers at intervals along crack length
• Pump Nitofill PU150 slowly until resin appears on the face of the crack
• Start at the lowest point and work upwards

Pre-Application Treatment

For dry cracks (not actively leaking), pre-flushing with water is required to provide moisture for the polyurethane reaction to initiate properly.

Reaction Data at Varying Temperatures

The following data demonstrates how temperature affects curing characteristics (at 1:1 water ratio):

Temperature (°C)	Cream Time (seconds)	Gel Time (min:sec)	Rise Time (min:sec)	Tack-Free Time (min:sec)
10	110	5:10	9:20	9:50
20	55	3:45	6:38	7:30
25	29	3:05	6:40	7:18
30	26	2:44	4:30	4:30

Complementary Products

Nitofill Accelerator can be used to adjust reaction times:

• Mixes with Nitofill PU150 to accelerate or modify reaction profiles
• Useful for adapting to specific job-site conditions
• Variable reaction times enable customization for project requirements

Fosroc Solvent 10 is used for cleaning:

• Remove uncured Nitofill PU150 from tools, equipment, and mixers immediately after use
• Cured material can only be removed mechanically

Storage and Shelf Life

• Shelf life: 12 months from date of manufacture
• Storage conditions: Keep in dry store in original, unopened packaging
• Important: Keep containers sealed to prevent atmospheric moisture absorption

Packaging

Nitofill PU150 is supplied in 20kg containers, facilitating handling for both small-scale repairs and larger construction projects.

References

• [1] Fosroc_Nitoflor_PA_TDS.pdf
• [2] Fosroc_Nitofill_PU150_TDS.pdf
• [4] Fosroc_Nitofill_PU130_TDS.pdf
• [5] Fosroc_Nitofill_Injection_Packers_TDS.pdf