Rubber Waterstop
Product Overview
Rubber waterstop is a high-performance sealing solution designed to prevent water passage through construction joints, expansion joints, and pipe penetrations in concrete structures. Manufactured from premium natural rubber or hydrophilic synthetic rubber compounds, it provides exceptional durability, flexibility, and long-term waterproofing performance [citation:6].
When embedded in concrete, rubber waterstop creates a physical barrier against water ingress. Hydrophilic varieties expand upon contact with water, forming a compressive seal that adapts to joint movement. Natural rubber types offer excellent elasticity and "memory," returning to original profile after extension or deflection [citation:9].
High Tensile Strength
>20 MPa tensile strength ensures durability under mechanical stress and concrete movement [citation:9].
Superior Elongation
>500% elongation at break accommodates significant joint movement without failure [citation:9].
Wide Temperature Range
Serviceable from -45°C to +70°C, suitable for extreme climates worldwide [citation:6][citation:8].
Aging & Tear Resistant
Excellent resistance to aging, ozone, wear, and tearing ensures long service life [citation:6][citation:7].
Product Types
Expands on contact with water to create a compressive seal. Ideal for applications where water exposure is expected.
- Expansion volume >300-400% [citation:1][citation:4]
- Withstands >50m water head pressure [citation:1]
- Self-healing properties
- No bentonite options available [citation:1]
High-grade natural rubber with excellent elasticity and "memory." Suitable for expansion joints and high-movement applications.
- Tensile strength >20 MPa [citation:9]
- Elongation >500% [citation:9]
- Accommodates movement >10mm [citation:9]
- Returns to original profile after deflection
Available in various profiles to suit different joint configurations and installation methods [citation:6].
- Center bulb (expansion joints)
- Dumbbell (contraction joints)
- Ribbed / Serrated surfaces
- Rectangular / Square section
- P-type / Flat type
Reinforced with steel edges for enhanced anchoring in concrete and increased tensile resistance [citation:7].
- Improved concrete anchorage
- Higher pull-out resistance
- Ideal for high-pressure applications
Technical Specifications
Physical & Mechanical Properties
| Property | Test Method | Hydrophilic Type | Natural Rubber Type |
|---|---|---|---|
| Material | - | Synthetic rubber / Butyl [citation:1][citation:2] | Natural rubber [citation:9] |
| Tensile Strength | ASTM D412 | >1.9 MPa [citation:1] | >20 MPa [citation:9] |
| Elongation at Break | ASTM D412 | >450% [citation:1] | >500% [citation:9] |
| Hardness | Shore A / IRHD | <50 [citation:1] | 62-72 IRHD [citation:9] |
| Density | - | 1.36-1.58 g/cm³ [citation:1][citation:4] | ~1.15 g/cm³ |
| Volume Expansion (Hydrophilic) | In-House | >300-400% [citation:1][citation:4] | N/A |
| Hydrostatic Pressure Resistance | - | >50m water head [citation:1] | Up to 50m [citation:9] |
| Service Temperature | - | -30°C to +50°C [citation:1] | -45°C to +70°C [citation:6][citation:8] |
Standard Dimensions
| Dimension | Available Sizes | Tolerance |
|---|---|---|
| Width | 200mm, 230mm, 250mm, 280mm, 300mm, 350mm, 400mm, 500mm [citation:7] | ±2mm |
| Thickness | 6mm - 12mm (custom available) [citation:7] | ±0.5mm |
| Roll Length | 10m, 20m rolls [citation:1][citation:7] | ±0.1m |
| Hydrophilic Section | 20mm x 10mm, 25mm x 20mm [citation:1][citation:4] | ±0.5mm |
Available Profiles
| Center Bulb (CB Type) – For expansion joints, accommodates movement up to 50mm [citation:9] | |
| Dumbbell (CP Type) – For contraction joints with no shear movement [citation:9] | |
| Rectangular Section – Hydrophilic waterstop for construction joints [citation:1] | |
| Flat / Ribbed (EP/EB Type) – External / Back贴式 installation | |
| Steel Edge Reinforced – Enhanced anchoring for high-pressure applications | |
| P, Q, T, H, Z Types – Special profiles for specific joint configurations [citation:6] |
Applications
Rubber waterstop is widely used in concrete structures requiring watertight joints [citation:6][citation:7].
Basements & Foundations
Construction joints, retaining walls, lift pits [citation:1]
Tunnels & Subways
Shafts, cut-and-cover, segment joints [citation:4][citation:8]
Water Treatment
Tanks, reservoirs, clarifiers, ponds [citation:1][citation:7]
Bridges & Dams
Expansion joints, abutments, culverts [citation:7]
Swimming Pools
Wall-floor joints, pipe penetrations [citation:4]
Pipe Penetrations
Through walls and slabs [citation:1][citation:2]
Key Advantages
Installation Guidelines
Substrate Preparation
Surface must be clean, dry, free from oil, laitance, and debris [citation:2]. Remove standing water.
Positioning
Locate waterstop centrally in joint, maintain minimum 75mm concrete cover [citation:1][citation:2].
Fixing
Mechanically fix at max 300mm centres using corrosion-resistant nails with washers [citation:1][citation:2].
Jointing
Overlap sections minimum 100mm [citation:1][citation:2]. For natural rubber, use vulcanising or cold bond.
Concrete Pour
Ensure concrete is well compacted around waterstop, avoid voids and honeycombs [citation:1].
Protection
Protect from premature water exposure before concrete pour [citation:1].
Important: For hydrophilic waterstops, avoid exposure to rain before concrete pour – premature swelling may occur. Use delay coating if necessary [citation:1].