Sika Sikaflex-291 Fast Curing Marine Adhesive and Sealant

Sikaflex®-291 is a 1-component, polyurethane sealant specifically developed for the marine market, which cures on exposure to atmospheric moisture. Used by many boat builders, its fast cure time makes it ideal for applications where speed is important. Sikaflex®-291 is manufactured in accordance with IOS 9001/14001 quality assurance system and the responsible care program.

Features:

• Bonds well to a wide variety of substrates
• Ideal for sealing thru hull and hardware applications
• Use above and below water line
• Resists salt water
• Elastic
• Low odor
• Fast curing
• Fast strength build-up
• Paintable and sandable
• Excellent adhesion to Gelcoat, fiberglass, metal and wood
• Can be gunned or brushed into place
• NSF approved for potable water
• USDA approved for incidental food contact

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%
• Service Temperature: -50 to 90°C (-58 to 194°F)
  • 4 hours: 160° (320°)
  • 1 hour: 180° (356°)
• Shelf Life: 12 months (storage below 25°C (77°F))

Application:

• Multipurpose product for use in marine constructions. It is suitbale to make elastic, vibration-resistant joint seals, and can also be used for a variety of interior sealing applications
• Sikaflex®-291 bonds well to the materials commonly used in marine construction like:
  • Wood
  • Metals
  • Metal primers and paint coatings (2-C systems)
  • Ceramic materials
  • Plastics (GRP, etc.)
• Sikaflex®-291 must not be used to seal plastics that are prone to stress cracking (e.g. Plexiglas, Polycarbonate, etc.)
• Once cured, Sikaflex®-291 can easily be sanded as required
• This product is suitable for experienced professional users only
• Test with actual substrates and conditions have to be performed to ensure adhesion and material compatibility

Product Data Sheet

Safety Data Sheet