Recommended for those comfortable using two component (1:1) injection grouts.
Leak-Proof SEMI FLEX is low-toxicity, two component 100% solids, MDI based polyurethane grout. It will displace and stop flowing water, forming a tough flexible foam firmly bonded to the concrete surface. SEMI FLEX
Leak-Proof SEMI-FLEX is a low toxicity polyurethane which forms a very durable closed cell grout foam. This cured material is also flexible enough to withstand future joint movement without losing adhesion to the surface.
This product will also expand to fill voids with the use of an accelerator (Leak-Proof ACC). The Leak-Proof ACC accelerator should always be added into the mixed grout when injecting into voids or cracks wider than 1/4 inch (6mm), to ensure the grout creates a nicely formed foam. The Leak-Proof ACC will also speed up the reaction time of the grout when it contacts water, enabling the technician to shut down flowing leaks. See http://www.leakproofonline.com to see the generally equivalent competitor products chart.
Leak-Proof SEMI FLEX
Uses
Leak-Proof SEMI FLEX can be used to stop water under a hydrostatic head and provide a resilient tough and semi-flexible closed cell polyurethane foam. Cracks in tanks, tunnels, pipes, basements, pools, subways or any structure where water intrusion must be stopped, are capable of repair with Leak-Proof SEMI FLEX
MAIN APPLICATIONS · Leaks in new tunnel construction. · Cracks in concrete basements. · Maintenance of transportation subways. · Settlement cracks in concrete pools and tanks. · Cracks in water dams and reservoirs. · Leaks in concrete pipes.
IMPORTANT PERFORMANCE BENEFITS · Simple 1:1 by volume mix ratio. · Can be used with high pressure pumps (up to 2500 psi) or with low pressure pots or convenient side by side cartridges (below 100 psi). · Components after mixing will provide up to 60 minutes “pot life” in the absence of water. this allows single component pumps to be utilized. · Initial low viscosity ensures excellent travel in cracks. · Closed cell foam provides outstanding water resistance. · Adhesion to wet concrete creates a durable water stop even under hydraulic pressure. · Flexible foam allows + 100% compression/elongation. · Rapid foam development cuts off water flow. Volume of foam may be 3-25 times the original liquid volume depending on crack dimensions. The wider the crack the greater the foam volume. · Capable of very rapid cure when used in conjunction with an available accelerator.
High Pressure Procedure (for high water flows) Leak-Proof CUT
Low Pressure Procedure (for low water flow) Leak-Proof CUT Leak-Proof Injection Ports
TECHNICAL DATA DENSITY OF MIXED MATERIAL 1·10 - 1·15. VISCOSITY OF MIXED MATERIAL (25°C) 450-550 cps COLOUR NATURAL CLEAR MIXING RATIO A:B 1 to 1 by volume POT LIFE after mixing 30-60 minutes* FOAM DEVELOPMENT in contact with water 30 seconds 10 % Accelerator 20 seconds 20 % Accelerator 10 seconds 30 % Accelerator 5 secondsADHESION TO WET CONCRETE – Tensile Pull 50 psi (Note:fails in foam layer) ELONGATION/COMPRESSION 150% FOAM VOLUME 3-25 times orig.liquid (finecracks – 3 volumes: wide gaps – up to 25 volumes)
*With increased humidity the presence of moisture reduces the pot life. When displacing water the foam development is rapid. Leak-Proof SEMI FLEX
ACCELERATOR An optional accelerator is available for stopping severe flowing water quickly. See addition levels under Technical Data above (levels are based on “A” portion). Surface Preparation
NOTE:
Low Pressure Injection - Use Leak-Proof Ports n Plugs
High Pressure Injection - Use Leak-Proof HD Packers (3/8's Plastic Hammer-In Ports )
Drill the holes at a 45o angle to intersect the crack approximately 4" below the concrete surface for a 8 inch thick wall. These holes should be drilled alternately on opposite sides of the crack allowing an 8" distance between them. This should ensure intersection of the crack. Alternatively , the holes can be drilled straight into the crack to a depth 2/3 the thickness of the wall, spaced every 3 inches for very tight cracks. (This method allows for higher injection pressures without damage to the concrete through blowouts.) Coat the packer or port with the grout prior to insertion into the cleanly water flushed drill hole for a superior seal.
After fitting injection ports or packers, the drill holes should be flushed out using water delivered through a 1/4" hose from a pressure pot (low pressure) or a high-pressure pump or grease gun (high pressure).
Be careful to check that each of the holes intersects the crack and a path is available for subsequent injection. Where no travel is evident then additional holes should be drilled to provide the necessary access to the crack.
Mixing and Application
The side by side cartridge or two component pump is the preferred equipment for grouting with Leak-Proof SEMI FLEX Leak-Proof SEMI FLEX
It is advisable to mix just a part of the unit initially - 1 litre would be appropriate - to determine rate of travel of the resin and to confirm how much material can be used well within the pot life.
Injection of the mixed Leak-Proof SEMI FLEX Leak-Proof SEMI FLEX Leak-Proof SEMI FLEX Leak-Proof SEMI FLEX appearing at the surface of the crack can be easily removed after it has completed foaming, using a sharp knife.
Clean Up
All equipment must be cleaned immediately after use. Thorough and repeated flushing is required. The equipment lines should then be filled with Leak-Proof Pump Cleaner
Safety and Toxicity
Leak-Proof SEMI FLEX is an MDI based two component polyurethane. These recommendations are common with all MDI based polyurethanes. Within the generic group of polyurethane polymer technology the MDI based polyurethanes are considered the safest in terms of safety and toxicity . Isocyanates are designated substances and are capable of producing a severe allergic breathing problem in some people. If any difficulty at all with breathing is experienced the person should immediately vacate the work area. Particular care should be taken to avoid mixing and application in confined areas. Avoid breathing vapours at any time. Two component systems are capable of producing injury to, or destruction of, skin and eye tissues. Precautions must be taken to prevent prolonged or repeated skin contact and it is essential to protect the eyes from splashes.
Repeated skin contact can also cause sensitization. Protective clothing, rubber gloves and chemical goggles should be worn when working with these products. A facemask with organic cartridge and a particulate filter is usually adequate. Air supplied mask is suitable for use in confined areas.
NOTE:
Although reactive chemicals are needed to form Leak-Proof SEMI FLEX
Storage
Store in heated area and on pallets. Do not allow products to freeze. Shelf life in unopened containers is one year. Once opened, then dependent on humidity, shelf life may be reduced to as little as 3 months.
Packaging
.5 US Gallons 'A' (1.89 litres) (1.89 litres) 2.5 US Gallons `A’ (9.45 litres) 2.5 US Gallons `B’ (9.45 litres) each in metal cans with resealable pouring spout. 10 FL.OZS A (0.3 litres) 10 FL.OZS B (0.3 litres) in side by side dispensing cartridges complete with ¼” – 24 element mix tube.
Purchase Information This and other high quality grouting products are available through the Johnson Group Online web-store located at http://www.leakproofonline.com or through designated distributors. For more information please call Johnson Group Online at 1-866-640-3476 or email sales@leak-proof.com .
Leak-Proof SEMI FLEX Crack Injection Polyurethane Grout www.LeakProofOnline.com
Warranty
Manufacturer WARRANTS that the product conforms to its chemical description and is reasonably fit for the purpose stated on its Technical Bulletin when used in accordance with its directions. Manufacturer makes NO OTHER WARRANTY either expressed or implied. Buyer assumes all risks in handling.
All information and statements are intended for persons having the required skill and know-how and do not relieve the user from verifying the suitability of the information and statements given for a specific purpose prior to use. The information, and in particular, the recommendations relating to the application and end-use of our products, are given in good faith based on Johnson Group Online and its manufacturers current knowledge and experience of the products when properly stored, handled and applied under normal conditions, within their shelf life, but accuracy and completeness of said information is not guaranteed and are not to be construed as a warranty either expressed or implied. In practise, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any recommendations, or from any other advice offered. Users should always refer to the most recent issue of the Technical Data Sheet and the MSDS for the product concerned, copies of which will be supplied on request or can be accessed in the internet under www.leakproofonline.com . Neither seller nor manufacturer shall be liable to buyer or any third person for any injury, loss or damage directly or indirectly resulting from use or inability to use this product. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery.
Johnson Group Online (1569373 Ontario Ltd.) warrants its products to be manufactured free of defects and will replace or, at our option, refund the purchase price of any materials proven to be defective. Seller’s and manufacturer’s sole responsibility shall be to replace that portion of the product of this manufacturer which proves to be defective. This limited warranty is in lieu of any other guarantee, expressed or implied, including warranties of merchantability or fitness for a particular purpose. In no event will Johnson Group Online(1569373 Ontario Ltd.) be liable for incidental or consequential damages nor shall liability, if any, extend beyond the purchase price of the material.
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Johnson Group Online (1569373 Ontario Ltd.) johnsongroup@leak-proof.com http://www.leakproofonline.com/
Pressure Grouting 
