PU FLEX-2

PU FLEX-2, is a water-reactive grout specifically designed for injection into leaking concrete, masonry or brickwork, to stop the flow of water. Commencement of the chemical reaction with water can be adjusted by the addition of a variable quantity of CATALYST.

PU FLEX-2 forms an excellent barrier against water seepage caused by hydroscopic pressure, has good chemical resistance and is non-toxic once set. By restraining the natural expansion created by this reaction, a strong closed-cell rigid foam is formed, providing a permanent barrier to the ingress of water.

Category:

COMPOSITION

PU FLEX-2 is a low viscosity MDI-based isocyanate, which transforms into a semi-flexible polyurethane foam when in contact with water. The reaction time is adjusted by the addition of CATALYST.

APPLICATION

  • Basement wall
  • Concrete Slab
  • Brick Wall
  • Water Tank
  • Sewerage Structure
  • Wet Areas
  • Lift pits, sewer etc

ADVANTAGES

  • Penetrates into cracks < 200 microns
  • Provides a totally water resistant barrier
  • Excellent bond strength
  • Non-toxis and can be in contact with portable water
  • Resistant to biological attack
  • Unaffected by salts or contaminants in water
  • Solvent and TDI free

TECHNICAL DATA

 PU FLEX-2CATALYSTCATALYSTCREAMRISE
AppearanceLight BrownTranslucentDosage (%)Time (s) Time (s)
Specific Gravity1.11.02288210
Viscosity (25˚C)120 cps15 cps556145
Flashpoint> 210˚C> 150˚C104695
Non-volatile matter97%-
Compressive Strength6.0N/mm²
Elongation in cured form40%
Shelf life (unopened)~12 months~12 months

*The reaction time @ 25˚C varies the amount of catalyst added and 5% of water existence

OPERATION PROCEDURE

PU FLEX-2 can be injected by electric-drilled operated injection pump or hand-held manual grout pump together with the required packers. Technical experienced in handling equipment and assessment of the site condition for suitable application should be necessary. It is recommended that pressurized grouting at the same position for two times to ensure no water leakage. (please refer to method statement provided).

STORAGE & HANDLING

Store in cool dry areas. Temperature above 50˚C may cause premature formation of insoluble solids. Good housekeeping is essential in areas where chemical spillage is likely to occur. Partly used drums/pails should be tightly sealed to prevent ingress of moisture. To increase the material life expectancy, partially used drum/pail should be filled with Nitrogen gas and sealed tightly to prevent contamination.

HEALTH & SAFETY

Avoid contact with skin, eye and avoid breathing vapor. Wear gloves, goggles and full clothing when handling with raw materials. Keep away from children. Provide adequate ventilation in confined spaces. If contact with skin occurs PU FLEX-2 should be removed with soap removing cream followed by washing with soap and water. DO NOT use solvent. Should poisoning occur, consult a physician in all cases. Should poisoning occur, call doctor immediately, DO NOT induce vomiting, drink plenty of water or milk. MSDS shall be available upon request.

PACKING

PU FLEX-2: 20kg, 25kg and 225kg/pail/drum
CATALYST: 1 kg, 5kg and 25kg/pack/pail

METHOD STATEMENT

  1. Drill 10mm/13mm/16mm diameter holes at 100-500mm intervals along the side of the crack or joint, at a 45˚ angle in order that the path of the crack or joints intersected in the center of the concrete slab/wall. The distance between holes will depend on the size of the crack or joint to be injected.
  2. Insert the mechanical packers into the 10mm/13mm/16mm diameter holes and tighten securely.
  3. Use a clean and dry bucket, pour in the PU FLEX-2 to the desired amount. Add the CATALYST gradually – average recommended at 5% (5:100). Mix/stir well. Increase the dosage if rapid curing is required.
  4. Commence injection by using SWM1000, SWM1100 or DHP-M2000 electric-drilled operated injection pump, ensuring that the crack is filled. The material must be visible during the initial set stage (yellowish expanding foam). Always return to previously injected packers/points and re-inject to ensure that the PU FLEX-2 is completely compacted.
  5. In the event of filling vertical cracks or joints, commence injection from the bottom. In case of horizontal cracks or joints, begin from either side.
  6. Inexperience operating the pump may cause the injection pump clog. Increase operating speed is required if higher dosage of catalyst is used.
  7. Allow the PU FLEX-2 to cure for 24 hours before removing the injected packers.   Exposed, solidified grout will be visible. Plug all holes   with a suitable mortar.
  8. It is recommended to flush the machine with non-flammable solvent before and after used.

EXAMPLES OF CONSTRUCTION WORK

PU Flex-2 Example Works