Description
Sikaflex®-552 is a one-component silane terminated polymer (STP) assembly adhesive designed for structural bonding applications with reduced surface preparation. This moisture-curing, elastic adhesive provides strong adhesion to a wide range of substrates and is formulated to accommodate dynamic stresses in industrial and transportation assemblies.
Key Features
- One-component silane terminated polymer assembly adhesive
- Designed for bonding with reduced substrate preparation
- Elastic and gap-filling for dynamic load applications
- Bonds to a wide variety of substrates with minimal pre-treatment
- Good resistance to aging and weathering
- Isocyanate-free and solvent-free formulation
- Non-corrosive and silicone-free
- Can be painted after curing
Technical Specifications
| Specification | Value |
|---|---|
| Chemical Base | Silane Terminated Polymer |
| Color | White, black |
| Cure Mechanism | Moisture-curing |
| Density (uncured) | 1.46 kg/l (12.2 lb/gal) |
| Application Temperature | 5 to 40 °C (41 to 104 °F) |
| Skin Time | 40 minutes |
| Open Time | 30 minutes |
| Shrinkage | 2% |
| Shore A Hardness | 60 |
| Tensile Strength | 3 MPa (430 psi) |
| Elongation at Break | 300% |
| Tear Propagation Resistance | 10 N/mm (55 pli) |
| Tensile Lap-Shear Strength | 2 MPa (290 psi) |
| Service Temperature | -50 to 90 °C (-58 to 194 °F) |
| Shelf Life | Cartridge/Sausage: 12 months Drum: 9 months |
Compatible Substrates and Materials
- Aluminum (including anodized)
- Sheet steel (phosphated, chromated, zinc-plated)
- Metals
- Ceramic materials
- Plastics
Application Guidance
Surfaces must be clean, dry, and free from grease, oil, and contaminants prior to application. Sikaflex®-552 can be applied between 5 °C and 40 °C, with optimal performance between 15 °C and 25 °C. Apply using manual, pneumatic, or pump equipment and ensure bonding parts are assembled within the open time. Tooling should be completed within the skin time, and adhesion testing on actual substrates is recommended before full application.
Typical Use Cases
- Assembly bonding in transportation and industrial equipment
- Bonding joints subjected to dynamic stresses
- Metal-to-metal and mixed-material bonding
- Panel bonding and structural assembly
- General industrial adhesive applications
Target Industries and Buyers
- Transportation and vehicle manufacturers
- Industrial equipment manufacturers
- Metal fabricators
- OEM assembly operations
- Maintenance, repair, and operations (MRO)
Performance Advantages
Within the structural adhesive category, Sikaflex®-552 provides strong adhesion combined with elastic performance for assemblies exposed to movement and dynamic stress. Its ability to bond with reduced surface preparation improves efficiency in production environments while maintaining reliable long-term performance.
Common Questions
Q: What is Sikaflex®-552 used for?
A: It is used for structural bonding and assembly applications, especially where reduced surface preparation is desired.
Q: What type of chemistry does it use?
A: It is based on silane terminated polymer (STP) technology.
Q: Does it require extensive surface preparation?
A: It is designed to bond well with minimal pre-treatment, though testing is recommended.
Q: Can it handle dynamic loads?
A: Yes, it is suitable for joints subjected to dynamic stresses.
Q: Can it be painted after curing?
A: Yes, it can be painted, with compatibility testing recommended.
Q: What is the application temperature range?
A: The recommended range is 5 °C to 40 °C (41 °F to 104 °F).
Q: Is it solvent- or isocyanate-based?
A: No, it is both solvent-free and isocyanate-free.
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