Sikaflex®-221 is a versatile, one-component polyurethane adhesive and sealant designed for permanent elastic sealing across a wide range of materials, including metals, metal primers, paint coatings, ceramics, and plastics. It offers strong adhesion, resistance to ageing, low odor, and can be sanded or painted after curing. Ideal for internal sealing and light bonding applications, Sikaflex®-221 provides a durable, non-corrosive seal suitable for professional use. For best results, Sika recommends testing on actual substrates—especially materials prone to stress cracking—to ensure optimal adhesion and compatibility.
