PU Foam injection
PU Foam injetion PU-300
Concrete often cracks. It is inevitably recognized and experienced. Concrete construction requires construction joints and cold joints. All of these unwanted openings in concrete structures may cause very serious problems of water leakage.
Most of these problems can be economically solved by utilizing the Pentens High Pressure Injection Systems. Pentens PU-300 one part polyurethane grouting is 100% solvent free and 100% solids. Its have been proven to accomplish two major purposes: one is to stop water leakage permanently, and the other is to maintain or even restore design strength. Slabs on grade, construction or control joints, parking garages, manholes, tanks, dams, and many other structures can now be fixed permanently. Pentens PU-300 is approved for drinking water contact.
Areas of application include:
- Floor slabs
- Suspended floors
- Terraces and balconies
- RC gutters and planter boxes
- Swimming pools
- Water tanks
- Basements and fountains
- Retaining walls
- Negative side application possible
- Deep penetration into very small cracks
- Foam increases in volume to fill cavities and voids
- Adjustable gel times
- Excellent bond to wet surfaces
- Underwater injection approved
- Good adhesive strength, tolerant of movement Inert after curing, constant volume, no shrinkage
- Does not create new cracks
STEP 1: Clean Surface
Sometimes the concrete surface is hidden under a surface of mineral deposits left from long-term water leakage.
STEP 2: Drill Injection Holes
In order to inject the resin into the crack, it is necessary to install injection ports, also called mechanical packers.
The depth of the drill hole intersecting the crack should be somewhere close to the center of structure, if possible.
STEP 3: Insert Injection Packers
Place packers in the previously drilled hole, so that the top of the rubber sleeve is below the concrete surface. If the packer can't be pushed into the hole, tap it in. Tighten the packer with a wrench as tight as necessary.
STEP 4: Flush Crack If Necessary
In some circumstances, it can be very useful to flush the crack with water to improve the subsequent penetration of the Pentens injection resin into thicker walls.
STEP 5: Crack Injection
Choose the proper resin for the correct application. The nature of the crack / joint and the conditions at the job site determine the choice of material. For general purpose, you may choose Pentens PU-108. Active water flow at a high rate is best stopped by using Pentens PU-168 for the first step then follows by PU-108. Moving cracks and expansion joints should be injected with Pentens PU-168. Hairline cracks and dry cracks should be sealed using Pentens T-800. Some problems are solved by using a combination of products.
STEP 6: Clean Up
Once the injection work is completed, a good and thorough clean up is essential. The packers can be removed within 24 hours and the holes should be patched by using Pentens T-800.
For more details, please refer to our Technical Department.
Tools and equipment just can be clean with Pentens SO3 or suitable thinner immediately after use.
Impervious gloves and barrier cream should be used when handling these products. Eye protection should be worn. In case of contact with eyes, wash thoroughly with plenty of water and seek medical advice if symptoms persist. If contact with skin occurs, it must be removed before curing takes place. Wash off with an industrial skin clearer followed by plenty of soap and water. Do not use solvent. Ensure adequate ventilation when using these products.
1.Minimum ambient and substrate temperature is 5°C.
2.Material shall be store in a dry cool place. Good storage stability for unopened containers at 15°C ~ 30°C.