Crack-Pac® Flex-H₂O™ is a high-solids hydrophobic polyurethane injection resin designed to seal leaking cracks, voids or fractures in concrete or solid masonry. The polyurethane is packaged in the cartridge and an accelerator is packaged in the nozzle. When the two are combined in the cartridge and mixed, the result is a low viscosity, water activated polyurethane. When the resin encounters water as it is injected into the crack, it becomes an expanding foam that provides a flexible seal in leaking and non-leaking cracks.

Features:

• Seals seeping or mildly leaking cracks
• 400% elongation provides a flexible seal for moving cracks
• Can be dispensed with a standard caulking tool
• Can be used with a reduced amount or without accelerator to slow down reaction time
• Expands to fill voids and close off the back of the crack
• Expanding nature makes it suitable for sealing cracks in solid masonry
• Fast reacting - reaction begins within 1 minute after exposure to moisture; expansion may be completed within 3 minutes (depending on the amount of moisture and the ambient temperature).
• Non-shrinking hydrophobic formula with the elongation and flexibility of a hydrophilic resin
• 20:1 expansion ratio (unrestricted rise) means less material needed
• Also suitable for dry cracks (with water added)

 

topTechnical Information

Installation:

• Cartridge Preparation and Mixing Instructions
• Injection Guide

Application:

Suitable for sealing cracks ranging from 0.8mm to 6.35mm wide in concrete and solid masonry. Can be used to repair cracks in dry, damp and wet conditions with excellent results. Designed to perform in applications where water is seeping or mildly leaking from the crack.

Shelf Life:12 months from the date of manufacture, unopened.

Storage Conditions: For best results store in a dry area between 7°-32°C. Product is very moisture sensitive.

Usage Temperature: 16°-32° C

colour: Polyurethane - clear; Accelerator - green; Cured - green

Clean Up:

Uncured material – Wipe up with cotton cloths. If desired scrub area with abrasive, waterbased cleaner and flush with water. If approved, solvents such as ketones (MEK, acetone, etc.), lacquer thinner, or adhesive remover can be used. DO NOT USE SOLVENTS TO CLEAN ADHESIVE FROM SKIN. Take appropriate precautions when handling flammable solvents. Solvents may damage surfaces to which they are applied. Cured material – scrape or brush off surface with a putty knife or wire brush. Tip: wetting the concrete or masonry surface immediately prior to injection will make cured resin easier to remove.

Chemical Resistance:

Very good to excellent against water, most hydrocarbons and alkaliis. Poor to fair against ketones, chlorinated solvents and concentrated acids.

Definitions:

Dry Crack: A crack containing no moisture.
Wet Crack: A crack containing moisture (damp or containing standing water). The surface can be dried and will remain dry during the paste-over operation.
Seeping Crack: A wet crack that slowly oozes water. After being dried, the surface slowly becomes wet again.
Mildly Leaking Crack: A crack with a slow trickle of water emitting from its face.

Technical Specifications:

Meets the requirements of ASTM C-881 Type I & II, Grade 1, Classes B & C.

PROPERTY	TEST METHOD	RESULTS
Viscosity (25°C)	ASTM D 1638	600 cps (liquid state)
Density	ASTM D 1622	Highly restricted rise - 65 lbs./ft3 Lightly restricted rise - 10 lbs./ft3
Elongation	ASTM D 638	Highly restricted rise - 400% Lightly restricted rise - 400%
Tensile strength	ASTM D 638	Highly restricted rise - 2200 psi Lightly restricted rise - 300 psi
Tear strength	ASTM D 624	Highly restricted rise - 400 psi Lightly restricted rise - 55 psi

Accessories / Related Products:

• E-Z-Click Injection Ports & Fittings

Product Data:

Crack Repair Adhesive Suitability Matrix: