Low Pressure Injection - Use Leak-Proof Ports n Plugs and fit the fat end into 5/8" holes drilled straight into the crack about 1/3 to 2/3 the depth of the crack.
High Pressure Injection - Use Leak-Proof HD Packers (3/8's Plastic Hammer-In Ports) in 3/8" holes.
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 single component pump is the preferred equipment for grouting with Leak-Proof FLEX. Leak-Proof FLEX should be fully mixed by pouring the required amount into a clean, moisture free mixing vessel and mixing by hand or with a low speed power mixer (200-300 rpm) until the activator is thoughly blended in. Scrape the sides and bottom of the mix container to ensure a complete mix is obtained.
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 FLEX is then carried out, commencing at the lowest injection point. As the Leak-Proof FLEX moves into the crack, water is displaced ahead of it. Once all the water is released then Leak-Proof FLEX will follow the water - when this is observed, injection should move on to the next packer and the same process continued along the crack until it is completed. Excess Leak-Proof FLEX appearing at the surface of the crack can be easily removed after it has completed foaming, using a sharp knife. Adjust the speed of activation by adding the required amount of activator (up to 5% by volume). Tight cracks should use less activator while wide ones will need a faster foam to offset the running out of the product from the crack.
Clean Up: All equipment must be cleaned immediately after use. Thorough and repeated flushing is required using Leak-Proof PUMP CLEANER. The equipment lines should then be filled with Leak-Proof PUMP CLEANER to eliminate air/moisture from the lines. Cured material should be mechanically removed.
Safety and Toxicity: Leak-Proof FLEX is an MDI based single 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. 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.
Refer to MSDS for details. MSDS is availble on request.
Although reactive chemicals are needed to form Leak-Proof FLEX the final cured material is a non-toxic polyurethane foam.
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.
Injection at Low Temperatures: Low temperatures will greatly lower viscosity and initial cure times. To minimize this effect, store the product at normal room temperature for a minimum period of 24 hours prior to use. If site temperatures are extremely low, heat bands may used on the pails before and during use to maintain the products temperature, lower the viscosity and improve penetration. Avoid splashing water into open containers, as the material is water activated. DO NOT EXCEED 26.5 degrees Celsius (80F) WHEN WARMING.