Description

Sikaflex 221 Multi-Purpose Adhesive and Sealant Pail

Sikaflex 221 Multi-Purpose Adhesive and Sealant Pail Overview

Sikaflex 221 is a versatile, one-component polyurethane adhesive and sealant designed to provide durable, permanent elastic seals across a variety of substrates, including metals, ceramics, and plastics. This moisture-curing sealant offers strong adhesion without the need for priming, making it ideal for general bonding and internal sealing applications. Available in a 4.5-gallon pail, it’s perfect for smaller-scale projects or maintenance work where efficient coverage is needed. Certified under NSF/ANSI/CAN 61 for drinking water system components and NSF Proprietary Substances and Nonfood Compounds, Sikaflex 221 ensures dependable performance for sensitive environments. Its low-odor, non-corrosive formulation makes it safe to use in confined spaces.

Sikaflex 221 Features and Benefits

• Versatile Adhesion: Bonds effectively to metals, ceramics, plastics, and paint coatings.
• Certified for Drinking Water Systems: NSF/ANSI/CAN 61 listed.
• NSF Listed for Nonfood Compounds: Suitable for sensitive applications.
• Non-Corrosive and Low Odor: Safe to use in confined spaces or enclosed environments.
• Aging-Resistant: Maintains durability over time, even in demanding conditions.
• Paintable and Sandable: Allows for a smooth, professional finish.

Specifications

• Series: Sikaflex 221
• Chemistry: One-Component Polyurethane
• Application: General Sealing and Bonding 
• Substrates: Metals, Metal Primers and Paint Coatings (2-Component Systems), Ceramic Materials, and Plastics
• Color: White and Black
• Cure Mechanism: Moisture-Curing
• Package Size: 4.5 Gallon Pail
• Density (Uncured): 10.8 lb/gal (1.3 kg/l)
• Application Temperature: 41°F to 104°F (5°C to 40°C)
• Skin Time: 60 Minutes
• Open Time: 45 Minutes
• Curing Speed: See Diagram on TDS
• Shrinkage: 5%
• Shore A Hardness: 40
• Tensile Strength: 260 psi (1.8 MPa)
• Elongation at Break: 500%
• Tear Propagation Resistance: 40 pli (7 N/mm)
• Service Temperature: -58°F to 194°F (-50°C to 90°C)
  • 24 Hours: 248°F (120C)
  • 1 Hour: 284°F (140C)
• Shelf Life: 6 Months
• Storage Temperature: Below 77°F (25°C) – Protect from Direct Sun Light

Other Package Sizes Available

• Sikaflex 221 Cartridges and Unipacks
• Sikaflex 221 50 Gallon Drum