Description
Sikaflex®-591 is a one-component silane terminated polymer (STP) marine sealant designed for multifunctional sealing and bonding applications. This moisture-curing, elastic sealant provides durable, weather-resistant performance for interior and exterior marine joints, offering strong adhesion across a wide range of common marine substrates.
Key Features
- One-component STP sealant for marine sealing and bonding
- Designed for interior and exterior marine applications
- Highly elastic for vibration-resistant joint sealing
- Excellent resistance to harsh marine weathering conditions
- Bonds well to a wide variety of marine substrates
- Non-sag formulation for vertical and overhead applications
- Free of isocyanates, solvents, PVC, phthalates, and tin catalysts
- Good tooling and processing characteristics
Technical Specifications
| Specification | Value |
|---|---|
| Chemical Base | Silane Terminated Polymer |
| Color | White, black, grey, brown |
| Cure Mechanism | Moisture-curing |
| Density (uncured) | 1.5 kg/l |
| Application Temperature | 5 to 40 °C (41 to 104 °F) |
| Skin Time | 35 minutes |
| Open Time | 20 minutes |
| Shrinkage | 1% |
| Shore A Hardness | 45 |
| Tensile Strength | 2.2 MPa (320 psi) |
| Elongation at Break | 500% |
| Tear Propagation Resistance | 15 N/mm (85 pli) |
| Service Temperature | -50 to 80 °C (-58 to 176 °F) |
| Shelf Life | 12 months |
Compatible Substrates and Materials
- Common marine substrates
- Metals
- Primed and painted surfaces
- Composite materials
Application Guidance
Surfaces must be clean, dry, and free from grease, oil, and contaminants prior to application. Sikaflex®-591 can be applied between 5 °C and 40 °C, with optimal performance between 15 °C and 25 °C. Apply using manual or pneumatic dispensing equipment and complete tooling within the skin time. Surface preparation methods depend on substrate type and should be verified through testing for optimal adhesion.
Typical Use Cases
- Marine joint sealing and bonding
- Interior and exterior sealing on boats and yachts
- Vibration-resistant joint sealing
- General-purpose marine maintenance and repair
Target Industries and Buyers
- Marine and boat manufacturers
- Shipyards and repair facilities
- Marine maintenance professionals
- OEM and assembly operations
Performance Advantages
Within the marine sealant category, Sikaflex®-591 offers a balance of elasticity, environmental resistance, and broad substrate compatibility. Its STP formulation supports durable sealing performance in harsh marine conditions while maintaining flexibility for vibration and joint movement.
Common Questions
Q: What is Sikaflex®-591 used for?
A: It is a multifunctional marine sealant for sealing and bonding applications on boats and marine structures.
Q: What type of chemistry does it use?
A: It is based on silane terminated polymer (STP) technology.
Q: Can it be used outdoors in marine environments?
A: Yes, it is designed to withstand harsh marine weathering conditions.
Q: Is it suitable for dynamic joints?
A: Yes, it provides elastic performance suitable for vibration-resistant joints.
Q: What surfaces does it bond to?
A: It bonds to a wide range of common marine substrates including metals, composites, and coated surfaces.
Q: What is the working time after application?
A: The open time is approximately 20 minutes, with a skin time of about 35 minutes.
Q: Can it be used on teak decking?
A: No, it is not suitable for teak wood applications.
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