Description
Sikaflex®-521 UV
Sikaflex®-521 UV is a weathering-resistant 1-component Silane Terminated Polymer (STP) adhesive / sealant that bonds well to a wide variety of bonding surfaces such as metals, ABS, PC, FRP and wood with usually no need for special pre-treatment. This multipurpose product is suitable for internal and external sealing applications.
Features
- Wheelmark approved
- 1-component formulation
- Highly elastic
- Low odour
- Non-corrosive
- Can be painted
- Bonds well to a wide variety of marine substrates
- Solvent free
- Very low VOC
- Low isocyanate content
Sealing applications
- Timber
- Metals
- Hatches
- Ports, etc.
Specifications
- Chemical base: Silane Terminated Polymer
- Colours: White, Black ,Grey
- Cure mechanism: Moisture-curing
- Density: 1.4 kg/L
- Non-sag properties: Good
- Application temperature: 5-40 degrees C (ambient)
- Skin time (CQP019-1): 30 minutes
- Shrinkage (CQP014-1): 2%
- Shore A hardness (CQP023-1/ ISO7619-1): 40
- Tensile strength: (CQP036-1/ ISO 527): 1.8 MPA
- Elongation at break (CQP036-1/ ISO 527): 400%
- Tear propagation resistance (CQP045-1/ ISO 34): 5.5N/mm
- Service temperature (CQP513-1): -50 to 90 degrees C, 4 hours 140 degrees C, 1 hour 140 degrees C
- Shelf life (CQP016-1): 12 months
Application
Surface preparation
urfaces must be clean, dry and free from grease, oil and dust.
Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond. Suggestions for surface preparation may be found on the current edition of the appropriate Sika® Pre-Treatment Chart. Consider that these suggestions are based on experience and have in any case to be verified by tests on original substrates.
Application
Sikaflex®-521 UV can be processed between 5 °C and 40 °C but changes in reactivity and application properties have to be considered. The optimum temperature for substrate and adhesive sealant is between 15 °C and 25 °C.
Sikaflex®-521 UV can be processed with hand, pneumatic or electric driven piston guns as well as pump equipment. For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.
Tooling and finishing
Tooling and finishing must be carried out within the skin time of the sealant. It is recommended using Sika® Tooling Agent N. Other finishing agents must be tested for suitability and compatibility prior the use.
Removal
Uncured Sikaflex®-521 UV can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically. Hands and exposed skin have to be washed immediately using Sika® Cleaner-350H cleaning towels or a suitable industrial hand cleaner and water.
Do not use solvents on skin.
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