HYDROJOINT SL is a hydrophilic, thermoplastic elastomeric expansive waterstop engineered for sealing concrete construction joints, concrete-steel interfaces, and underground precast elements. Delivered with a swell retardant coating, it expands gradually upon water contact—fresh or salt—and reversibly returns to its original size when dry, ensuring reliable long-term performance. HYDROJOINT SL offers safe, easy installation with nails or PU adhesive, excellent chemical resistance, non-toxicity, and superior flexibility to absorb construction movements. Its high swelling capacity and reversible expansion make it ideal for dynamic environments requiring durable, maintenance-free waterproofing solutions.
Hydrojoint SL is bonded or nailed onto a prepared, level concrete strip at the construction joint before the next concrete pour.
Summary of the method in the Hydrojoint Sl Technical Data Sheet. Always follow the full TDS on site.
| Standard | Title | Referenced for |
|---|---|---|
| ASTM D792 | Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement | Density |
| ASTM D471 | Standard Test Method for Rubber Property—Effect of Liquids | Effect of liquids (swelling) |
| ASTM D412 | Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension | Tensile strength |
| ASTM D2240 | Standard Test Method for Rubber Property—Durometer Hardness | Shore D hardness |
Standards and test methods as referenced in the Hydrojoint Sl Technical Data Sheet. Values in the TDS are typical laboratory results under standard conditions.
Swelling capacity is 50% after 2 hours and 300% after 24 hours, and expansion in 5% NaCl salt water at room temperature is 200% after 30 days. It shrinks back to its original size in dry conditions, and repeated cycles do not affect performance.
Glue it with a suitable polyurethane glue onto a leveled 3 cm strip of clean concrete, keeping at least 8 cm clearance from the formwork on both sides, and wait 6 hours for the glue to dry before concreting. Alternatively, nail it at 25 cm intervals.
No. The TDS states these waterstops are not suitable for movement joints; they are intended for concrete construction joints, concrete-steel joints and underground precast elements.
Hydrojoint SL can be installed from -15°C to 50°C.
It is supplied as a 20 x 10 mm rectangular section in 5 LM rolls. Shelf life is 2 years when stored dry and frost free in the original unopened packaging, below 30°C, away from direct sunlight and high humidity.
