Sika 106096 Sikaflex 521 UV Resistant Polyurethane Sealant White 10.3oz Cartridge

Sikaflex® 521 UV is a professional-grade, multi-purpose polyurethane sealant designed for applications requiring superior UV resistance and long-term durability. This one-part, non-sag sealant cures upon exposure to atmospheric moisture, forming a highly elastic elastomer that maintains flexibility and adhesion across a wide temperature range. The silane-terminated polymer formula is both solvent-free and isocyanate-free, making it safer to use in enclosed spaces.

Key Features:

• UV resistant formula prevents yellowing and degradation from sun exposure
• Bonds to wood, metals, aluminum, steel, painted surfaces, ceramics, plastics, and glass without primers
• Non-sag consistency ideal for vertical and overhead applications
• Solvent-free and isocyanate-free formulation with very low VOC
• Silicone-free and PVC-free composition
• High electrical resistance for insulation applications
• Excellent resistance to aging, weathering, and environmental conditions

This 10.3 oz (300ml) cartridge is compatible with standard caulking guns and provides permanent, high-strength elastic seals for marine, RV, automotive, and general construction applications. Sikaflex 521 UV works particularly well on anodized aluminum, phosphated and chromated metals, zinc-plated components, and two-part paint systems, making it an ideal choice for demanding sealing and bonding tasks.