Expansion Joint Polyurethane Sealant
Expansion Joint Polyurethane Sealant
Structural Engineering Joint Sealing System for Concrete Infrastructure
Expansion Joint Polyurethane Sealant is a professional-grade, one-component, moisture-curing elastomeric sealing system designed for structural expansion joints, construction joints, and dynamic movement joints in concrete infrastructure.
It is engineered for long-term structural integrity, not temporary gap sealing, and is widely used in bridges, highways, tunnels, airports, industrial floors, and civil engineering structures exposed to mechanical load, thermal cycling, vibration, and water ingress.
Engineering Solution Principle
High Elastic Recovery
Maintains elasticity under repeated joint movement, preventing cracking and permanent deformation.
Strong Multi-Substrate Adhesion
Bonds securely to concrete, stone, masonry, and metal for stable long-term sealing.
Fatigue Resistance
Withstands continuous vibration and structural stress without performance loss.
Waterproof Barrier Protection
Blocks water penetration and prevents capillary moisture migration through joints.
UV & Weather Resistance
Resists sunlight, rain, and aging for reliable outdoor durability.
Wide Temperature Stability (-40°C to +90°C)
Performs consistently under extreme cold and heat with stable flexibility and adhesion.
Technical Performance Data
|
Property |
Value |
Standard |
|
Base Chemistry |
Polyurethane (PU) |
- |
|
Curing System |
Moisture curing |
- |
|
Density |
1.30 ± 0.1 g/cm³ |
ISO 1183 |
|
Skin Formation Time |
30–90 min |
ASTM C679 |
|
Cure Rate |
2–3 mm / 24h |
Internal test |
|
Movement Capability |
±25% to ±50% |
ASTM C719 |
|
Shore A Hardness |
20–40 |
ASTM D2240 |
|
Tensile Strength |
≥1.0 MPa |
ASTM D412 |
|
Elongation |
≥400% |
ASTM D412 |
|
Service Temperature |
-40°C to +90°C |
- |
Engineering Case Studies
Highway Bridge Joint System – Middle East
Used in large-scale bridge expansion joints exposed to extreme heat and heavy traffic. The sealant maintained long-term elasticity and prevented water ingress under high thermal movement.
Metro Tunnel Waterproof Joint – Southeast Asia
Applied in underground tunnel segment joints with constant humidity and vibration. It provided reliable waterproof sealing and reduced leakage risks in critical transit infrastructure.
Industrial Warehouse Flooring – Europe
Used in high-load industrial floors with frequent forklift traffic and structural movement. The sealant ensured durable joint protection, resisting cracking and edge breakdown over time.
Installation Standard
Sealant performance is highly dependent on installation quality.
Surface Preparation
Remove dust, laitance, oil, and loose particles.
Backer Rod Installation
Ensures correct depth-to-width ratio for movement control.
Primer Application
Recommended for:
Porous concrete
Metal substrates
High-load infrastructure joints
Sealant Application
Apply continuously using professional dispensing equipment.
Tooling
Complete within skin time to ensure full adhesion contact.
Curing
24–72 hours depending on joint geometry and environment.
Quality Assurance & Verification System
This product is manufactured under controlled quality systems with available documentation:
- ISO 9001 Quality Management System
- ASTM C920 / C719 performance test reports
- EN 15651 compliance documentation
- RoHS / REACH compliance reports
- MSDS / TDS technical documentation
- Batch-level QC inspection records
OEM & Global Supply Capability
OEM / Private Label
We offer OEM and private label services to support different market branding needs.
Color Customization
Standard colors include gray, black, and white, with customized options available for project requirements.
Climate-Adapted Formulations
Formulations can be adjusted for different climates to ensure stable performance in extreme conditions.
Bulk Packaging Options
Available in cartridges, sausage packs, and drums for industrial and large-scale applications.
Stable Production Capacity
We maintain consistent large-scale manufacturing capacity to ensure reliable long-term supply.
Global Export Support
We provide export support and documentation for global infrastructure and engineering projects.
Engineering Risk Control & Warranty Logic
Substrate Condition
Good adhesion requires clean, dry, and sound substrates for reliable bonding.
Joint Design
Proper joint size and structure ensure correct movement performance and durability.
Primer Use
Suitable primers improve adhesion on concrete, metal, and stone surfaces.
Curing Conditions
Temperature and humidity during application affect final sealant performance.
Warranty Principle
Performance is guaranteed when correct surface preparation and standard installation are followed.
FAQ
Q: Where is PU sealant used in infrastructure?
A: It is used in bridges, highways, tunnels, airports, industrial floors, and concrete structures with movement joints.
Q: What is its service life?
A: Typically 10–20 years depending on installation quality and environmental exposure.
Q: Can it replace silicone sealant?
A: Not in all applications. PU is preferred for structural joints; silicone is used for façade sealing systems.
Q: Is primer necessary?
A: Yes, especially for porous or high-load engineering substrates.
Q: Why is PU preferred for structural joints?
A: Because it combines high adhesion + fatigue resistance + elasticity, which silicone cannot fully provide in load-bearing systems.
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