Strong water inflow
Limiting active leaks, including under high hydrostatic pressure. Dosage and stages must be selected through a trial under actual flow conditions.
LEAK STOPPING
WaterStopper
Water-reactive PU resin for rapidly limiting active water ingress and filling cracks and gaps. Reaction time is controlled by an added initiator.
| Product / preparation | PU resin + initiator; contact with water starts the reaction |
|---|---|
| Pump | 1K — one circuit for the prepared mixture of resin and initiator |
| Resin viscosity | 100 ± 10 mPa·s at 20°C |
| Resin density | Approximately 1.18 g/cm³ at 20°C |
| Reaction result | Semi-rigid foam; volume increase up to 22 times |
| Application temperature | Material, ambient and substrate above +5°C |
Technical data
Read values together with the temperature, material state and test conditions.
| Initiator — viscosity / density at 20°C | 60 ± 5 mPa·s / approximately 1.24 g/cm³ |
|---|---|
| 91.5 ml of initiator per 1 l of resin | Start 13 s; end 34 s |
| 57.3 ml of initiator per 1 l of resin | Start 13 s; end 1 min 6 s |
| 24.2 ml of initiator per 1 l of resin | Start 28 s; end 3 min 30 s |
Times come from a test with 18% water. The TDS does not state the temperature of this test; it must not be inferred from the viscosity measurement temperature. Water in the test is not a recommendation to add it to the pump tank. Expansion up to 22 times is not a conversion factor for consumption in a gap.
- Storage and shelf life
- +10 to +30°C; 12 months in the original, unopened packaging.
Applications and selection criteria
First establish the repair objective, substrate condition, presence of water and joint movement.
Cracks and larger gaps
Filling in concrete and underground structures where water is present to enable the reaction. Where outflow paths are open, prepare containment of the zone.
First stage before the final seal
After controlling the water, assess the entire leak path and joint operating conditions. The TDS provides for CrackFlex as an optional second stage.
Limiting outflow before curtain injection
For intense leaks or large voids, WaterStopper may precede curtain injection to limit the escape of water and subsequently injected material. After this stage, select the curtain material and check continuity of the entire seal.
Application conditions and limitations
Do not assign semi-rigid foam to joints requiring defined movement without checking the method. Cessation of outflow during application alone does not confirm watertightness of the entire cross-section. Reaction time with water differs from the storage time of prepared resin in the system.
How the material behaves
Requires water; active flow and hydrostatic pressure are selection criteria. Semi-rigid foam; no assigned permissible joint movement.
1. 1K tank
Resin + initiator
2. In the gap
Contact with water
3. Result
Semi-rigid foam and flow limitation
Preparation and application
Work sequence after assessing the structure and selecting the method. Full requirements are given in the product instructions.
Assess the leak and prepare access
Assess the substrate, remove loose fragments, drill and clean holes, and install packers. Close the crack surface according to the method; the TDS specifies CrackOn.5.
Add initiator and check the reaction
Select the volumetric dose and mix thoroughly with the resin. Perform a small trial with water before work. Protect the supply and tank from moisture.
Inject with a 1K pump
Select pressure for the structure, observe quantity, flow and passage between points. For a vertical crack, start at the bottom; adjust delivery based on observations.
Assess watertightness and prepare the next stage
After stopping ingress, assess whether further sealing is needed. Plan cleaning according to reaction time and the product and pump instructions; do not treat the pause threshold as a guarantee that the system will remain clear.
From selection to application
Choose the instructions for your task and calculate material quantities using clearly defined assumptions.
Product documentation
Data, application instructions and safety documents for the supplied material.
Preparing for safe work
Before use, read the current documentation for all supplied components. Select protective equipment, ventilation and cleaning methods appropriate to the material and equipment.
Discuss your project conditions
Prepare a description of the substrate, water, geometry and expected result. Let us select the material and delivery method.