Nitofill PU130: Hydrophobic Polyurethane Injection Resin

Product Overview

Nitofill PU130 is a multi-purpose hydrophobic polyurethane injection resin specifically designed for structural repair and sealing applications in concrete and masonry structures. As a single-component system, it utilizes an accelerator to adjust the reaction profile for various job site conditions.

Primary Applications

Nitofill PU130 is engineered for the following key applications:

• Sealing against leaking cracks and joints in concrete structures
• Sealing against water infiltration in masonry and brickwork
• Void filling in inaccessible locations within concrete
• Back grouting operations for structural reinforcement

Key Advantages

The product delivers several distinct advantages for concrete repair projects:

• High hydrostatic pressure resistance – Can withstand elevated water pressures during application
• Variable reaction times – Adjustable through accelerator concentration to suit job site conditions
• Semi-flexible properties – Maintains flexibility after curing while providing structural support
• Water-reactive formulation – Reacts with saline and mineral water, making it effective in wet conditions
• Environmentally safe – Solvent-free formulation

Chemical and Physical Properties

Mechanical Performance

The cured foam exhibits robust mechanical characteristics measured at 25°C with 2.5% water and 2.5% accelerator:

Property	Specification	Test Standard
Density	32 kg/m³	ASTM D-1622
Shear Strength	118 kPa	ASTM C-273
Tensile Strength	202 kPa	ASTM D-1623
Elongation	44%	ASTM D-1623
Water Absorption	<1%	ASTM D-2127

Resin Properties

Property	Value
Viscosity	500 cps
Color	Amber
Gel Time	1 minute 15 seconds

Expansion and Foam Formation

When mixed with up to 5% accelerator, Nitofill PU130 initiates expansion in approximately 12 seconds and produces a foam with greater than 29 times original volume in 55 seconds at 25°C.

Reaction Profile by Temperature

The expansion characteristics vary significantly with temperature and accelerator concentration:

Temperature (°C)	Accelerator (%)	Initiation Time (sec)	Expansion Time (min:sec)	Foaming Ratio
10	2.5	50	3:15	>20x
20	2.5	19	2:10	>25x
25	2.5	15	1:15	>28x
30	2.5	11	0:55	>31x

At 25°C, varying accelerator concentrations produce:

• 0% accelerator: 43 sec initiation, >18x foaming ratio
• 1.25% accelerator: 23 sec initiation, >21x foaming ratio
• 5% accelerator: 12 sec initiation, >29x foaming ratio

Material Composition and Properties

Hydrophobic Characteristic

The polyurethane foam formed from Nitofill PU130 possesses hydrophobic properties that resist water absorption. This water-repellent characteristic enables effective sealing against water infiltration and moisture penetration, making it particularly valuable for applications requiring protection from water exposure.

Chemical Resistance

The cured polyurethane foam demonstrates strong chemical resistance, providing protection against chemical degradation and attack. This property ensures durability in aggressive industrial environments.

Water Reactivity

Nitofill PU130 is formulated to react with available water in concrete structures. The reaction mechanism allows the product to:

• Activate with mineral water and saline water
• Function effectively in wet or damp concrete environments
• Form a semi-flexible polyurethane foam upon hydration

Supply and Packaging

Product	Product Code	Specification
Nitofill PU130	FC300899-20KG	20kg drums
Nitofill Accelerator	FC300901-1KG	1kg containers
Fosroc Solvent 10	FC600800-4L	4 litre containers
Steel Packer 10mm x 95mm	FC344228-UNIT	Pack of 100 units
Steel Packer 13mm x 100mm	FC344227-UNIT	Pack of 100 units
Nitofill Coupler 4 Jaw	FC344226-UNIT	Pack of 5 units

Storage and Shelf Life

Nitofill PU130 maintains a shelf life of 12 months from the date of manufacture when stored in a dry location in original, unopened packaging. Proper storage is essential to prevent unwanted moisture absorption that could trigger premature reaction.

Application Requirements

Accelerator Usage

The optional Nitofill Accelerator can be added at concentrations up to 5% per 20kg drum to modify reaction time according to specific job site conditions. Between 2% and 5% concentrations are typically employed to accelerate reaction times when required.

Injection Equipment

Nitofill PU130 requires:

• High-pressure injection packers (10mm x 95mm or 13mm x 100mm steel packers)
• Nitofill Couplers (4 Jaw design) for reliable connection
• Single-component injection pump equipped for high pressure
• Grease nipple valve for quick hose connection/disconnection with positive shut-off

Mixing Requirements

The material must be:

• Mixed using a dry, clean drill and paddle mixer for a minimum of 15 seconds before application
• Kept in sealed containers when not in use to prevent atmospheric moisture absorption
• Conditioned to appropriate temperatures for at least 12 hours prior to application

Cleaning and Removal

Uncured material can be removed from tools, equipment, and mixers using Fosroc Solvent 10 immediately after use. However, cured material can only be removed mechanically, requiring grinding or similar methods for complete removal from surfaces and equipment.

Environmental and Safety Considerations

Nitofill PU130 is formulated as a solvent-free product, making it environmentally safe while maintaining high performance standards. Safety Data Sheets and Technical Data Sheets are available from the Fosroc website and should be consulted prior to use.

References

• [1] Fosroc_Nitofill_PU130_TDS.pdf
• [5] Fosroc_Nitofill_Accelerator_TDS.pdf
• [6] Fosroc_Nitofill_Injection_Packers_TDS.pdf