Sikaflex®-221 is a versatile, one-component polyurethane sealant/adhesive designed to deliver durable, elastic seals and strong bonds across a wide range of substrates. The white 10.3 oz (300 ml) cartridge makes it a practical choice for both professional projects and DIY tasks that require movement tolerance and long-lasting performance.
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Type: One-component polyurethane sealant/adhesive that cures on exposure to atmospheric humidity to form a durable elastomer.
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Color: White.
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Size: 10.3 oz (300 ml) cartridge.
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Substrate compatibility: Bonds to wood, metals (and metal primers/paint coatings), ceramics, and plastics.
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Non-sag and elasticity: Non-sag, highly elastic—ideal for vertical surfaces and movement-prone joints, while maintaining elasticity over time.
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Weather and aging resistance: Weather- and age-resistant for long-lasting indoor or outdoor performance.
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Paintability and prep: Paintable and sanding-ready, allowing seamless finishing with surrounding surfaces.
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Safety and certifications: Non-corrosive; NSF-registered; UL listed for potable water; Meets ASTM C920; ANSI/UL 723 surface burning characteristics.
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Availability and identification: Available in black, grey, and white; Manufacturer: Sika; Part No: 90891; UPC: 338860050980.
Sikaflex®-221 provides a proven combination of strong adhesion and long-term elasticity across wood, metals, ceramics, and plastics. Its non-sag formula is especially helpful for vertical joints and applications subject to movement, while its weather- and age-resistance ensures reliable performance indoors or outdoors. Being paintable and sanding-ready lets you blend the sealant with surrounding finishes for a clean, professional look. The product is non-corrosive, NSF-registered, and UL listed for potable water, expanding its suitability to plumbing and water-related installations. It meets ASTM C920 and ANSI/UL 723, reflecting its established quality standards and safety certifications.
