Hebei Youou Bridge Materials
Water-swelling Waterstop Strip
Hydrophilic rubber and putty sealing strip for concrete construction joints, deformation joints and underground waterproofing.
Product Overview
Water-activated sealing for concrete joints
Water-swelling waterstop strip is a polymer waterproofing material made from high-quality rubber and hydrophilic swelling materials. When it contacts water, it expands to fill gaps and forms a dense sealing barrier.
The product is widely used in construction joints, expansion joints, settlement joints and pipe penetrations of concrete structures. It helps achieve the effect of sealing water by using water pressure and swelling pressure.
Product Classification
Putty Type and Rubber Finished Type
Putty Type PN / BW
Also called bentonite waterstop strip. It is usually black and soft, with good self-adhesion and slow swelling performance.
Construction joints, post-cast strips and areas above normal groundwater level
Rubber Finished Type PZ / BF
Red or black hard rubber strip with higher strength, good elasticity and selectable swelling ratios.
Expansion joints, settlement joints and water-pressure positionsKey Features
Designed for Reliable Joint Waterproofing
Water-swelling sealing
After contact with water, the strip expands and fills micro-gaps to form a reliable water barrier.
Dual sealing function
It combines elastic rubber sealing with water-swelling pressure sealing for stronger waterproof performance.
Simple installation
Putty type can be directly adhered; rubber type can be fixed with adhesive or steel nails.
Corrosion resistance
Good resistance to alkali, aging and common concrete environments without corroding concrete.
Delayed swelling options
Slow-swelling models help prevent premature expansion during construction and concrete pouring.
Custom specifications
Section size, swelling ratio, shape and roll length can be customized for different projects.
Common Specifications
Standard roll sizes and custom sections
| Section Size | Common Length | Typical Use |
|---|---|---|
| 20 x 15 mm | 5 m / roll | Small construction joints |
| 30 x 20 mm | 5 m / roll | Most common specification |
| 30 x 40 mm | 5 m / roll | Large-gap sealing |
| 20 x 50 mm | 5 m / roll | Wide joint waterproofing |
Technical Parameters
PN/BW putty type and PZ/BF rubber type indicators
| PN / BW Item | Indicator |
|---|---|
| Volume expansion ratio | ≥220% / ≥300% / ≥400% |
| High temperature flow, 80 C x 5 h | No flowing |
| Low temperature test, -20 C x 2 h | No brittle cracking |
| Specific gravity | 1.4-1.6 g/cm3 |
| PZ / BF Item | PZ-250 | PZ-400 | PZ-600 |
|---|---|---|---|
| Hardness, Shore A | 42 +/- 7 | 42 +/- 7 | 45 +/- 7 |
| Tensile strength, MPa | ≥3.5 | ≥3.5 | ≥3.0 |
| Elongation at break, % | ≥450 | ≥450 | ≥350 |
| Volume expansion ratio, % | ≥250 | ≥400 | ≥600 |
| Low temperature bending, -20 C x 2 h | No crack | No crack | No crack |
Installation Notes
Keep the strip dry before concrete pouring
- Clean the base surface before installation; remove dust, oil and loose concrete.
- Press the strip tightly against the concrete interface without gaps, lifting or twisting.
- Use steel nails for vertical joints to prevent displacement during pouring.
- Pour the next concrete section as soon as possible after installation.
- Keep the product away from moisture, rain and direct sunlight during storage.
Applications
Used in Underground, Transport, Hydraulic and Building Projects
Need Water-swelling Waterstop Strips?
Send us the section size, type, swelling ratio, roll length, quantity and project position. We will help confirm the suitable model and quotation.