Our hydrophilic water-swelling rubber rings are compounded with modified EPDM and super absorbent polymer to expand automatically on contact with water, achieving 150%–300% volume expansion. They fill micro-gaps to help block water seepage and offer anti-aging, corrosion resistance, and non-toxic, eco-friendly performance for basement, tunnel, pipeline, and rebar waterproofing projects. Custom sizes, colors, expansion rates, and logos are available.

Hydrophilic Self-Expansion Technology with automatic gap sealing: Blended with a high-water-absorption resin within an EPDM matrix. When exposed to water, it gradually expands by 150%–300% in volume, tightly filling micro-gaps between steel rebar, pipelines, and concrete. It forms lasting contact pressure to block water channels and delivers a “stop water by water” effect—addressing hidden leakage issues comprehensively.

Dual Waterproof Performance: Elastic Seal + Swelling Block integrates the original EPDM elastic sealing function with water-swelling self-repair. In dry conditions, it provides a tight seal with adjoining components. If micro-cracks or slight displacement occur due to foundation settlement, it absorbs water and expands automatically to repair gaps—offering a double waterproof guarantee compared with ordinary rubber gaskets.

Premium Modified EPDM Matrix and Long Service Life: Based on industrial EPDM rubber with excellent resistance to ozone, UV radiation, and aging. Maintains stable elasticity in the range of -40°C to 120°C, and resists underground groundwater, alkaline concrete, and mildly corrosive liquids. Repeated water absorption and expansion will not reduce swelling performance, ensuring durability for decades in underground projects.

One-Piece Precision Molding for Easy On-Site Installation: Injection molded in one piece with no burrs, uniform density, and a stable expansion rate. Soft texture allows it to be easily installed over rebar, bolts, and pipelines, with no complicated construction process. It replaces traditional asphalt, hemp tape, and metal waterstops, significantly reducing labor and construction costs. Non-toxic and pollution-free—no harmful substances are released after long-term water immersion.

Full OEM Customization & Broad Engineering Compatibility: Custom inner/outer diameters, thickness, expansion ratios (150%/220%/300%), colors (black/red/gray), and silk-screen brand printing are available. Suitable for basement rebar, through-wall pipelines, tunnel segment joints, subway applications, reservoir use, sewage pipe connections, and underground pipe gallery sealing. Supports small trial orders as well as bulk wholesale; free samples are available for qualifying mass clients.

Primarily used in underground, hydraulic, and construction waterproofing projects:

Civil buildings: basement floor rebar, through-wall water supply and drainage pipelines, split-bolt waterproofing

Municipal engineering: subway tunnel segment joints, comprehensive pipe galleries, sewage pipeline sealing

Water conservancy projects: reservoir, culvert, swimming pool, underground water tank construction joints

Industrial projects: underground factories, power cable penetration casings, foundation anti-uplift bolt waterproofing

We supply water stop rings to global construction material distributors, engineering contractors, pipeline manufacturers, and waterproofing material wholesalers.

Complete Custom Support

Size customization: Custom ID, OD, thickness, and cross-section shapes (O-ring, flat gasket, special profile)

Performance customization: Adjust the water swelling ratio and EPDM hardness according to water pressure requirements

Appearance customization: Black, red, gray, and other colors; silk-screen brand logos on the surface

Mold development: Produce non-standard special-shaped swelling rings based on customer drawings and samples

Flexible order policy: Accept small trial orders for engineering testing and large bulk wholesale

Sample service: Free samples for customers placing mass bulk orders