Sikaflex-521 UV is a multi-purpose, UV resistant, non-sag, elastic, one-part silane-terminated polymer sealant, which cures on exposure to atmospheric moisture to form a durable elastomer. Sikaflex-521 UV is solvent and isocyanate free. Features Cartridge Sikaflex 521UV UV Resistant LM Polyurethane Sealant Very low VOC/solvent free Silicone and PVC-free Isocyanate-free High electrical resistance Resistant to aging and weathering Specifications Color: White Capacity: 10.3 oz Weight: 1 lbs