Description
Sikaflex®-291 is a one-component polyurethane adhesive sealant for marine construction and maintenance applications. This moisture-curing, non-sag sealant is designed for elastic sealing and bonding on common marine substrates, supporting vibration-resistant joints and general-purpose sealing work in marine environments.
Key Features
- One-component polyurethane adhesive sealant for marine applications
- Moisture-curing formulation
- Non-sag consistency for controlled application
- Elastic, vibration-resistant sealing performance
- Bonds to a wide variety of substrates used in marine construction
- Good aging and weathering resistance
- Low odor, non-corrosive formulation
- Can be sanded and overpainted after curing
Technical Specifications
| Specification | Value |
|---|---|
| Chemical Base | 1-component polyurethane |
| Color | White, black |
| Cure Mechanism | Moisture-curing |
| Density (uncured) | 1.3 kg/l |
| Application Temperature | 5 to 40 °C (41 to 104 °F) |
| Skin Time | 60 minutes |
| Open Time | 45 minutes |
| Shrinkage | 5% |
| Shore A Hardness | 40 |
| Tensile Strength | 1.8 MPa (260 psi) |
| Elongation at Break | 500% |
| Tear Propagation Resistance | 6 N/mm (35 pli) |
| Service Temperature | -50 to 90 °C (-58 to 194 °F) |
| Shelf Life | 12 months |
Compatible Substrates and Materials
- Wood
- Metals
- Metal primers
- Paint coatings (2-component systems)
- Ceramic materials
- Plastics such as GRP
Application Guidance
Surfaces should be clean, dry, and free from grease, oil, and dust before application. Sikaflex®-291 can be processed between 5 °C and 40 °C, with optimum substrate and sealant temperature between 15 °C and 25 °C. Tooling and finishing should be completed within the skin time, and adhesion should be verified on actual substrates and application conditions before production use.
Typical Use Cases
- Elastic joint sealing in marine construction
- Vibration-resistant sealing applications
- Interior sealing in marine assemblies
- General-purpose bonding and sealing in boats and marine equipment
- Sealing around components, panels, and fittings in marine builds
Target Industries and Buyers
- Boat builders
- Marine repair and maintenance professionals
- Marine OEM manufacturers
- Shipyards
- Industrial sealing and bonding professionals serving marine markets
Performance Advantages
Within the marine adhesive sealant category, Sikaflex®-291 offers a practical balance of elasticity, substrate compatibility, and weathering resistance. Its non-sag application properties and ability to bond and seal across common marine materials make it a versatile option for professionals handling movement-prone joints and general marine sealing tasks.
Common Questions
Q: What type of product is Sikaflex®-291?
A: It is a one-component polyurethane adhesive sealant for marine applications.
Q: How does Sikaflex®-291 cure?
A: It cures by reaction with atmospheric moisture.
Q: Can it be painted after application?
A: Yes, it can be overpainted after skin formation.
Q: Can the cured material be sanded?
A: Yes, once cured, it can be sanded as required.
Q: What substrates does it bond to?
A: It bonds to materials commonly used in marine construction, including wood, metals, metal primers, paint coatings, ceramic materials, and plastics such as GRP.
Q: Are there plastics it should not be used on?
A: Yes, it should not be used to seal plastics that are prone to stress cracking, such as Plexiglas and polycarbonate.
Q: What is the recommended application temperature range?
A: The application temperature range is 5 °C to 40 °C (41 °F to 104 °F).
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