Water Swelling Rubber Strip for Concrete Joints – Expanding Waterstop Seal for Tunnel and Basement

Product Overview This water swelling rubber strip is designed to provide a watertight seal for concrete construction joints. Upon contact with water, it expands volumetrically to fill gaps, preventing water ingress in tunnels, subways, and basements.

Features Volumetric expansion when exposed to water Highly elastic and durable in buried applications Compatible with various concrete types Easy to install during construction phase.

Technical Specifications Material: Bentonite or hydrophilic modified rubber Expansion Rate: 150–400% Standard Sizes: 20×10mm, 25×5mm, 30×10mm Tensile Strength: ≥ 2.5 MPa Elongation at Break: ≥ 400% Temperature Resistance: -30°C to +70°C.

Applications Underground basements and foundations Precast concrete tunnels and culverts Retaining walls and water tanks Subways, metros, and water reservoirs.

Customization Options Custom cross-sections and roll lengths Color-matching (usually red, black, blue) Co-extruded types with delay coating Pre-cut pieces and adhesive-bonded variants