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Structural joints must accommodate building movement while maintaining long-term sealing and waterproofing. Selecting the right sealant is essential for project durability, safety, and maintenance control.
Two materials dominate the construction market: silicone sealant and polyurethane (PU) sealant. Each performs differently depending on joint location and exposure conditions.
This article compares both options for three common applications: curtain wall joints, expansion joints, and concrete joints.
| Property | Silicone Sealant | Polyurethane Sealant |
|---|---|---|
| UV & weather resistance | Excellent | Moderate |
| Movement capability | High | Medium |
| Adhesion to concrete | Moderate (primer recommended) | Excellent |
| Paintable | No | Yes |
| Typical service life | Longer | Moderate |
Curtain wall systems are constantly exposed to UV radiation, wind pressure, and temperature changes. Sealants must maintain elasticity and adhesion over long periods.
Silicone sealant is the preferred solution due to its superior weather resistance and movement capability, especially for glass and aluminum façades.
Recommended product:
One Component Silicone Sealant for Curtain Wall Glass (25HM / 35HM / 50HM)
Suitable for perimeter glazing joints, façade sealing, and exterior curtain wall systems.
Expansion joints accommodate structural movement between building sections or slabs.
Silicone sealant is recommended for exterior expansion joints with high movement and weather exposure.
Polyurethane sealant is suitable for interior or protected expansion joints where strong adhesion and surface durability are required.
Recommended PU product for construction joints:
Construction Polyurethane Sealant
This product provides strong bonding to concrete, masonry, and metal, and is suitable for joints exposed to mechanical stress.
Concrete joints require excellent adhesion and abrasion resistance, especially in industrial floors and structural slabs.
Polyurethane sealant is generally the best choice for these applications due to its strong bonding to porous substrates and mechanical durability.
Recommended product:
KINGWIT Modified Polyurethane Sealant for Concrete Joint Sealing
Ideal for concrete panel joints, basement joints, and structural crack sealing.
When selecting sealants for structural joints, consider:
Exposure to sunlight and weather
Expected joint movement
Substrate materials
Whether surface coating or painting is required
Silicone sealants are optimal for façade and glazing systems, while polyurethane sealants are better suited for concrete and mechanically stressed joints.
Different joint conditions require different performance priorities. Choosing the correct sealant type can significantly reduce long-term maintenance costs and failure risks.
If you are sourcing sealants for construction projects, contact us with your joint type and application conditions. Our technical team can recommend suitable products and provide bulk supply support for your projects.
Contact Person: Viola
Whatsapp: +8619353218907
Tel: +8619353218907
Email: viola@sdsealant.com
