Durable Hydrophilic Water‑Swellable Rubber Waterstop for Construction Joints

Water swellable rubber waterstop is compounded from natural rubber, hydrophilic expansion materials and auxiliary formula materials. The product combines traditional rubber sealing performance with water-absorbing swelling characteristics. When contacting water, the built-in hydrophilic components slowly absorb water and expand to fill gaps between concrete joints, blocking water seepage channels effectively.
It is widely applied in cast-in-place concrete structural joints, deformation joints, construction joints of underground engineering, water conservancy projects, municipal tunnels, subway facilities, sewage treatment structures and basement buildings, providing long-term waterproof sealing protection for concrete structures.

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Model:
Customized
Brand:
MingHeng

Core Product Features

Dual sealing performance: Base rubber layer maintains stable physical toughness for long-term structural buffering; hydrophilic swelling part fills tiny gaps after water contact, forming double waterproof barrier.
Controlled water swelling property: Balanced expansion rate design prevents excessive expansion from cracking concrete; stable expansion effect in fresh water, sewage and weak alkaline water environment.
Stable physical durability: Good tensile strength, elongation and compression resilience, adapts to slight displacement and deformation of concrete joints without breakage.
Weather and chemical resistance: Resists ageing from long-term underground buried environment, tolerates weak acid, weak alkali and common sewage medium erosion.
Easy on-site installation: Integrated one-piece molding, flat and neat edge structure, fits closely with concrete during pouring, compatible with standard concrete construction process.

Main Application Scenarios

Underground construction: Basement, underground garage, comprehensive pipe gallery
Water conservancy works: river channel, dam, aqueduct
Municipal traffic: Subway tunnel, highway tunnel, bridge underground structure
Environmental facilities: Sewage treatment plant, sedimentation tank, drainage culvert
Civil construction: Building expansion joint, post-cast strip, foundation construction joint

Construction Installation Guidance

Fix the waterstop at the middle position of concrete joint before pouring concrete, use steel fixture to fix to avoid offset during concrete pouring.
Ensure half part of the waterstop is buried in each side of two pouring concrete layers.
Avoid long-term direct exposure to sunlight before construction; store in cool and dry warehouse, prevent pre-contact with rainwater to avoid early swelling.
During concrete pouring, vibrate concrete fully around waterstop to eliminate voids and ensure tight adhesion between rubber and concrete.
Do not use sharp tools to scratch the product surface during installation, to protect internal hydrophilic expansion components.

Why Choose Our Product

Independent production workshop, full production process control from raw material mixing to finished product molding
Flexible customization service: Adjust expansion rate, product size, rubber hardness based on project site environment
Professional foreign trade engineering team, provide technical parameter consultation and installation suggestion support
Long-term stable raw material supply chain, keep stable product quality and reasonable unit cost for bulk orders

Product Technical Parameters

Parameter		Value
Material		Natural Rubber + Hydrophilic Expansion Materials
Hardness（Shore A）		60±5
Tensile Strength（MPa）		≥10
Elongation at break （%）		≥300
Compression set	70ºC*24h （%）	≤35
	23ºC*168h（%）	≤20
Brittleness temperature（℃）		≤-45
Thermal-airaging （70ºC x168h）	Hardness（Shore A）	≤+8
	Tensile Strength（Mpa）	≥10
	Elongation change rate（%）	≤300

FAQ

Q1：Can I get customized size?

A: Yes, we accept non-standard width, thickness and expansion strip layout customization based on engineering drawings.

Q2: How to store the goods before construction?
A: Store in dry, ventilated warehouse, avoid rain immersion and direct sunlight; finish construction within valid storage period.

Q3: How long does delivery take after placing an order?
A: The delivery time for regular orders is typically 7 to 20 days, depending on the product type and order quantity.

Q4: How to get a product quote?

A: Please send the product model, specifications, quantity, and other technical requirements to us. We will provide a formal quote within 24 hours.

Q5: Do you provide samples?
A: Samples are available. Sample costs and shipping charges are to be discussed with the sales representative.