Sika Sikaflex-221 Multi-Purpose Polyurethane Sealant and Adhesive

Sikaflex®-221 is a high-quality multi-purpose 1-component polyurethane sealant/adhesive that bonds well to a wide variety of substrates It is suitable for making permanent elastic seals and cures on exposure to atmospheric humidity to form a durable elastomer. Meets approvals ASTM C920 types Sikaflex®-221 is tested and classified in accordance with ANSI/UL 723 "Test for Surface Burning Characteristics of Building Materials".

Features:

• Bonds well to a wide variety of substrates
• Highly elastic and durable
• Resistant to ageing and weathering exposure
• Non-corrosive
• Low odor
• Can be sanded and overpainted
• NSF registered, Proprietary Substances and Nonfood Compounds (black, grey, and white)
• UL listed for potable water (black, grey, and white)
• Passes EN45545-2 R1/R7 HL3

Specifications

• Chemical Base: 1-component polyurethane
• Cure Mechanism: Moisture-curing
• Density (uncured): 1.3 kg/L (10.8 lbs/gal)
• Non-sag Properties: Good
• Application Temperature: 5 - 40°C (41 - 104°F)
• Skin Time: 60 minutes (23°C (73°F)/50% r.h.)
• Open Time: 45 minutes (23°C (73°F)/50% r.h.)
• Shrinkage: 5%
• Shore A Hardness: 40
• Tensile Strength: 1.8 MPa (260 psi)
• Elongation at Break: 500%
• Tear propagation resistance: 7 N/mm
• Service Temperature: -50 to 90°C (-58 to 194°F)
  • 24 hours: 120°C
  • 1 hour: 140°C
• Shelf Life: 12 months (storage below 25°C (77°F))

Application:

• Sikaflex®-221 bonds well to a wide variety of substrates and is suitable for making permanent elastic seals of high adhesive strength
• Suitable substrate materials are:
  • Wood
  • Metals
  • Metal primers
  • Paint coatings (2-c systems)
  • Ceramic materials
  • Plastics

Product Data Sheet

Safety Data Sheet