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Swelling Waterstop
mingheng
Product Features
Water swelling
Expands upon contact with water to actively seal gaps.
Easy installation
Can be fixed using adhesive, slots, or nails for quick installation.
Water resistance
Maintains swelling and sealing effect in damp or submerged environments.
Good adaptability
Suitable for irregular joints or structures with limited movement.
Customizable
Cross-sectional shape, dimensions, and hardness can be tailored to project requirements.
Technical Parameters
PZ type water-swellable rubber waterstop strip | |||||
| Phyical propertiess | Model | ||||
| PZ-150 | PZ-250 | PZ-400 | PZ-600 | ||
| Hardness (shore A) | 42±7 | 42±7 | 45±7 | 48±7 | |
| Tensile strength(Mpa) ≥ | 3.5 | 3 | |||
| Elongation(%)≥ | 450 | 350 | |||
| Volume expansion ratio(%)≥ | 150% | 250% | 400% | 600% | |
| Repeated water immersion test | Tensile strength(Mpa) ≥ | 3 | 2 | ||
| Elongation(%) ≥ | 350 | 250 | |||
| Expansion rate(%)≥ | 150 | 250 | 300 | 500 | |
| Low temperature bending (-20°Cx2h) | No crack | ||||
PN putty-type water-swellable rubber waterstop strip | |||||
| Phyical propertiess | Model | ||||
| PN-150 | PN-220 | PN-300 | |||
| Volume expansion ratio(%)≥ | 150 | 220 | 300 | ||
| High temperature flowability(80°Cx5h) | No flow | ||||
| Low temperature Test(-20°Cx2h) | No crack | ||||
Application Scenarios
Construction joints of basement slabs and side walls in underground works
Tunnel lining joints
Joints of precast concrete elements
Pipe penetration through walls
Expansion joints of water tanks and dams
Structural joints of subway stations
Material & Working Principle
Rubber matrix (natural rubber or neoprene) – provides elasticity and structural strength for flexible installation
Water-absorbent resin (polyacrylate type) – rapidly absorbs water and swells upon contact, actively filling joint voids
Additives (plasticizers, anti-aging agents, etc.) – improve processability and extend service life
| Stage | Description |
| Installation | Strip is fixed to concrete joint surface or pre-formed groove, kept dry |
| Water contact | Water penetrating the joint contacts the strip; resin absorbs water |
| Swelling | Strip volume gradually increases, compressing concrete surfaces |
| Sealing | Forms a tight compressed seal, blocking water path |
| After drying | Strip partially shrinks but can re-swell on subsequent water contact |
FAQ
Q1: Is a higher swelling ratio always better?
A: Not necessarily. Excessive swelling may over-compress concrete (especially in narrow joints), causing local cracking. Choose ratio based on joint gap and water pressure.
Q2: How to store unused waterstop?
A: Keep in sealed packaging, store in cool, dry place away from direct sunlight and high temperature. Use promptly after opening; reseal remaining material.
Q3: What is the lead time?
A: Standard orders ship 7-15 days after confirmation. Custom sizes or ratios require discussion.
Q4: How long does it take to get a quote?
A: Quote provided within 24 hours after receiving your inquiry.
Q5: Is customization supported?
A: Yes. We can customize cross-sectional shapes (rectangular, round, trapezoidal, etc.), dimensions (width, thickness, length), and swelling ratios according to project requirements.
