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Sikaflex® 221 Multi-Purpose Polyurethane Sealant/Adhesive is a high-quality, one-component polyurethane that cures on exposure to atmospheric humidity to form a durable elastomer. Packaged in a 10.3 oz (300 ml) cartridge, this versatile sealant/adhesive comes in Black for a clean, seamless finish.
Designed as a non-sag formula, Sikaflex®-221 provides reliable performance for permanent elastic seals and high-adhesion bonds, even in challenging applications. Its outstanding elasticity and resistance to aging and weathering ensure long-lasting performance in indoor and outdoor environments.
- Excellent substrate adhesion — bonds to a wide variety of materials including wood, metals, metal primers and paint coatings (2-C systems), ceramic materials, and plastics.
- Durable and elastic — stays flexible under temperature changes and exposure to the elements.
- Non-corrosive and paintable — can be sanded and overpainted to match surrounding finishes.
- Safety and compliance — NSF registered; UL listed for potable water in black, gray, and white variants.
Applications: Ideal for permanent elastic seals and high-strength bonds in construction, automotive, marine, and general purpose projects. It forms reliable, long-lasting joints on wood, metals, ceramics, and plastics, making it a go-to solution for sealing edges, joints, and mounting surfaces that may experience movement.
Important safety notice: Prop 65 warning — This product can expose you to chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit P65Warnings.ca.gov.
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