Double Layer Swelling Waterstop Strip Sequential Expansion for Multi Stage Waterproofing

Product Overview This advanced water swelling rubber strip features dual expansion zones for staged sealing in high-risk water ingress zones such as multi-layered tunnel linings or utility shafts.

Features Two-stage expansion structure Primary and delayed sealing zones Resists premature expansion High pressure sealing performance.

Technical Specifications Material: Dual-core swelling rubber Primary Expansion: 150–200% Delayed Zone: 48–96 hrs delay; 250–350% swelling Size Options: 30×10mm, 25×12mm Service Temp: -30°C to +80°C.

Applications Shield tunnel segment joints Multi-layer utility tunnels Shaft walls and watertight compartments Critical leak-prone cold joints.

Customization Options Tailored expansion timing per zone Special profile extrusion Multi-color coding per function Pre-assembled kits.

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.