MDTI Urethane Injection System
Urethane injection, also known as polyurethane or grout, is the most common way to seal and fill a crack in a concrete and foundations. The popularity of urethane injection as a solution is due to its flexibility and versatility for a variety of applications, including commercial and residential foundation repair.
#900 MDTI Hydro Sealant
#900 is a single component hydrophilic polyurethane chemical grout. When it comes in contact with water it quickly expands to form a tough flexible closed cell foam which bonds extremely well to concrete. When cured it becomes an extremely tough and flexible barrier against water penetration.
Properties of #900 Hydro Sealant
|Weight Per Gallon||9.1|
|Induction Time||20 – 30 Seconds|
|Cure Time||4-6 Minutes|
Cured Foam Test Results
|Tensile Strength||ASTM D-1623||380 psi|
|Bond Strength||ASTM D-1623||250-300 psi|
|Shrinkage||ASTM D-1004||Less than 10%|
|Tear Resistance||ASTM D-3574||21 lbs./ Inch|
|Density||ASTM D-3574||494 kg / m3|
Results are based on foam cured under pressure. Properties may vary depending on job conditions.
How to Use MDTI’s Urethane System
Surface must be clean and sound. Remove all dirt, grease, wax, curing compounds and other foreign matter. Remove water and dust from all surfaces with and oil free air blast prior to application.
Mix additional surface seal material and seal off the crack and around the base of each port. Apply approximately 1/8” thick layer of material by 3” wide over the center of the crack. Prior to injecting #900, flush crack with clean water beginning at the top port. Remove tail plug from the empty cartridge and fill with clean water. Leave enough room in the cartridge to reinstall the tail plug.
Beginning at the bottom port, inject the #900 with steady pumps. Pump until resin appears at the next port above. Work your way up the wall until you have reached the top.
Drilled Port Procedure
- Drill injection port holes at a 45` angle to intersect the crack midway through the depth of the structure. These holes should be approximately 6” to 24” apart depending on the width of the crack.
- Clean the holes out by injecting water through a wand that will reach to the back of the hole.
- Insert packer or bang in port. Remove the zerk tips from all of the ports except the first one to be injected.
- Inject clean water into port at 250 psi min. Air and water will begin to flow out of the crack and ports above. Repeat this process for each port.
- Remove the zerk tips from all ports except the first one to be injected. Be sure to use a different pump or flush the pump thoroughly with solvent.
- Starting with the first port pump the #900 at 250 psi. Increase the pressure as needed to gain full penetration. Always use the lowest pressure possible to inject the crack. Never exceed maximum safe operating pressures.
- Once the material has fully penetrated the crack or begins to flow out of the next port, put the zerk tip on the next port and begin pumping. Repeat this procedure until the entire crack has been pumped.
- Flush out your pump at the end of the day. Material left in the pump may cure overnight and ruin the pump.
- Contact MDTI for further application instructions.
Use safety glasses or chemical goggles and gloves when handling materials. Avoid breathing vapors. Vapor overexposure may cause respiratory irritation, central nervous system depression, and allergic reaction. Use adequate ventilation. In case of skin contact, remove any contaminated clothing. Wash area of contact with soap and water. For eye contact, flush immediately with plenty of water for at least 15 minutes. Contact physician immediately.
#900 Urethane Warranty Information
All recommendations, statements and technical data contained herein are based on tests we believe to be reliable and correct. MDTI warrants its products to be free of manufacturing defects and that at the time and/or place of shipment our material will meet current published physical properties when applied with ASTM and MDTI standards. MDTI liability is limited to the replacement of the material if found to be defective. As MDTI has no control of the use to which others may put its products, it is recommended the products be tested to determine if suitable for specific application and/or our information is valid In a particular circumstance. Responsibility remains with the architect, engineer, contractor and the owner for the design, application and proper installation of each product. Nothing contained herein shall be construed to be a recommendation to use or as a license to operate under or to infringe any existing patents.