Sikaflex 221 Multi-Purpose Adhesive and Sealant

Sikaflex 221 Multi-Purpose Adhesive and Sealant Overview

Sikaflex 221 is a versatile, one-component polyurethane adhesive and sealant designed to bond well to a wide variety of substrates, including metals, ceramic materials, plastics, and paint coatings. It provides durable, elastic seals for internal sealing and general bonding applications. With certifications under NSF/ANSI/CAN 61 for drinking water system components and NSF Proprietary Substances and Nonfood Compounds, Sikaflex 221 ensures reliable performance in sensitive environments. This low-odor, non-corrosive sealant is suitable for professional use, offering long-term durability and flexibility.

Sikaflex 221 Features and Benefits

• Versatile Adhesion: Bonds well to metals, ceramics, plastics, and paint coatings.
  
• Certified for Drinking Water Systems: NSF/ANSI/CAN 61 listed (aluminum gray, black, white).
  
• NSF Listed for Nonfood Compounds: Approved for sensitive applications.
  
• Aging-Resistant: Provides durable, long-lasting performance.
  
• Paintable and Sandable: Allows for a professional finish.
  
• Non-Corrosive and Low Odor: Ideal for enclosed or sensitive spaces.

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, Aluminum Gray, Black, and Colonial White
  
• Cure Mechanism: Moisture-Curing
  
• Package Size: 10.1 fl oz (300 mL) Cartridge, 13.5 oz (400 mL) Unipack, and 20.3 oz (600 mL) Unipack
  
• 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: 12 Months
  
• Storage Temperature: Below 77°F (25°C) - Protect from Direct Sun Light
  

Applications

Sikaflex 221 is ideal for internal sealing and general bonding applications, especially where sensitive certifications are required. It works well with metals, ceramics, plastics, and paint coatings, making it suitable for use in truck, trailer, RV, and marine assembly. This sealant is also an excellent choice for appliance and component assembly, offering flexibility for various industrial and construction needs

Other Package Sizes Available

• Sikaflex 221 4.5 Gallon Pails
  
• Sikaflex 221 50 Gallon Drums