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.