Sikaflex®-221 – Premium High-Performance Polyurethane Sealant & Adhesive for Construction, Automotive & Marine Applications

Sikaflex®-221 is a premium, high-performance polyurethane sealant and adhesive engineered for demanding construction, automotive, and marine applications. Its advanced formulation delivers exceptional adhesion to a wide range of substrates including metal, plastic, glass, wood, and concrete, ensuring long-lasting bonds that remain flexible under dynamic conditions. This moisture-curing sealant offers excellent gap-filling properties, superior resistance to harsh weather, UV rays, and vibrations while accommodating building movements and structural shifts. Ideal for both sealing and bonding tasks, Sikaflex®-221 is designed to meet rigorous performance standards in extreme environments, providing a reliable, durable solution for critical projects.

Key Features

• Premium high-performance polyurethane formulation
• Exceptional adhesion to diverse substrates
• Moisture-activated curing technology for reliable bonding
• Superior gap-filling and flexibility to accommodate movement
• Excellent weather, UV, and vibration resistance
• Versatile use in construction, automotive, and marine applications

Specifications

• Composition: Polyurethane-based, one-component system
• Curing Method: Moisture-curing
• Application: Sealing, bonding, and glazing
• Typical Cure Time: Approximately 24 hours (varies with conditions)
• Temperature Range: Suitable from -40°C to +80°C
• Performance Attributes: High elongation, low shrinkage, and long-term durability
• Environmental Impact: Low volatile organic compounds (VOC) formulation