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

Shenzhen Xunzhi Building Materials Industrial Co., Ltd. is an integrated enterprise specializing in design, production, and sales, with many years of experience in manufacturing and technical product development. The company has two subsidiaries: Hong Kong Ruisong Technology Co., Ltd. and Sanya Ruisong Technology Co., Ltd. It is a professional manufacturer of door and window seals, curtain wall seals, and vehicle door sealing strips, providing one-stop rubber sealing solutions to global customers for many years.

We specialize in the production and processing of various sealing and molding products, including PVC (Polyvinyl Chloride), EPDM (Ethylene Propylene Diene Monomer), high-grade thermoplastic rubber (Santoprene), silicone rubber, dual-hardness sealing strips, rigid decorative strips, EVA single- and double-sided adhesive products for doors, windows, and curtain walls, as well as molded parts and plastic-rubber injection components.

The company is equipped with a strict quality assurance system, comprehensive testing procedures, and excellent after-sales service. Our products are highly recognized and praised by industry professionals, and are exported to Europe, America, Southeast Asia, and Hong Kong and Macao regions.