Sikaflex®-591 is a premium, multipurpose marine sealant based on Sika’s Silane Terminated Polymer (STP) technology. It offers excellent adhesion to a wide variety of marine substrates, including gelcoat, fiberglass, stainless steel, aluminum, copper, brass, bronze, standard marine primers and paints, SMC, ABS, PVC, wood, and plywood. This sealant is designed for both above and below the waterline applications, providing a durable, long-lasting, waterproof seal.
- IMO Approved: Meets the low spread flame requirements (FTP Code Part 5) set by the International Maritime Organization (IMO).
- Environmental Compliance: Free of isocyanate, solvents, PVC, phthalates, and tin catalysts.
- High Elasticity: Highly elastic, accommodating joint movements and vibrations.
- Superior Weathering Resistance: Excellent resistance to weathering and seawater, ensuring durability in harsh marine environments.
- Excellent Processing and Tooling Characteristics: Very good processing and tooling characteristics, facilitating ease of application.
Technical Specifications:
- Chemical Base: Silane Terminated Polymer
- Color Options: White, Black, Grey, Brown
- Cure Mechanism: Moisture-curing
- Density (Uncured): 1.5 kg/l
- Non-Sag Properties: Very good
- Application Temperature: 5 °C to 40 °C (41 °F to 104 °F)
- Skin Time: 35 minutes at 23 °C (73 °F) and 50% relative humidity
- Open Time: 20 minutes at 23 °C (73 °F) and 50% relative humidity
- Curing Speed: Varies with temperature and humidity; refer to product data sheet for detailed information.
- 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 °C to 80 °C (-58 °F to 176 °F)
- Shelf Life: 12 months when stored below 25 °C (77 °F)
Materials: Sikaflex®-591 is formulated without isocyanates, solvents, PVC, phthalates, or tin catalysts, making it environmentally friendly and safe for use in marine applications.
Compatibility Information: Sikaflex®-591 bonds well to substrates commonly used in the marine industry, including fiberglass, gelcoats, metals (stainless steel, aluminum, copper, brass, bronze), and plastics (SMC, ABS, PVC). It is not suitable for applications with teak wood and plastics that are prone to stress cracking (e.g., PMMA, PC).
