Sikaflex® 221 is a versatile, one-component polyurethane sealant/adhesive designed for permanent elastic seals and high-adhesion bonds across indoor and outdoor projects. Packaged in a black 10.3 oz (300 ml) cartridge, it delivers a clean, seamless finish.
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Size / Packaging: 10.3 oz (300 ml) cartridge
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Color: Black
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Material: One-component polyurethane sealant/adhesive
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Curing method: Cures on exposure to atmospheric humidity to form a durable elastomer
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Formulation: Non-sag for reliable vertical and overhead joints
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Substrate adhesion: Bonds to wood, metals, metal primers and paint coatings (2-C systems), ceramics, and plastics
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Durability: Durable and elastic—remains flexible under temperature changes and weathering
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Finish compatibility: Non-corrosive; paintable and sandable to match surrounding finishes
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Safety & compliance: NSF registered; UL listed for potable water (variants available in black, gray, and white); Prop 65 warning applies
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Applications: Ideal for permanent elastic seals and high-strength bonds in construction, automotive, marine, and general purpose projects
Sikaflex® 221 helps you create reliable joints that move with temperature fluctuations and exposure to the elements. Its strong adhesion across a wide range of substrates reduces the need for multiple products, while its elasticity keeps bonds intact over time. The paintable finish lets you finish with surrounding coatings for a seamless look, and the non-sag formulation ensures precise application on edges, joints, and mounting surfaces in demanding environments.
