- Product description
- Technical details
Weather-resistant STP adhesive and sealant with a broad adhesion spectrum
- Resistant to ageing and weathering
- Good adhesion to a wide range of substrates without special pre-treatment
- Free from isocyanate and solvents
- Resistant to ageing and weathering
- Good adhesion to a wide range of substrates without special pre-treatment
- Free from isocyanate and solvents
- Can be painted over
- Sandable
- Low odour
Sikaflex®-521 UV adheres well to a variety of substrates and is suitable for permanent, elastic sealing and bonding. Suitable substrates, including wood, are metals, primers and paints (two-component systems), ceramic materials and plastics. This universal product is suitable for interior and exterior waterproofing. Follow the manufacturer's recommendations before using Sikaflex®-521 UV on materials at risk of stress cracking. Preliminary tests must be carried out with original materials to avoid stress cracking. This product is only suitable for experienced users. To ensure adhesion and material compatibility, preliminary tests must be carried out with original materials under the respective conditions.
Chemical base: Silane-terminated polymer (STP)
Colour (CQP001-1): white
Curing mechanism: Moisture curing
Density before curing: 1.4kg/litre
Stability: good
Processing temperature: 5 to 40°C
Skin forming time (CQP019-1): 30 minutes (23°C)
Volume change (CQP014-1): -2%
Shore A hardness (CQP023-1 / ISO 7619-1): 40
Tensile strength (CQP036-1 / ISO 527): 1.8 MPa
Elongation at break (CQP036-1 / ISO 527): 400%
Tear resistance (CQP045-1 / ISO 34): 5.5 N/mm
Shelf life (CQP016-1): 12 months when stored below 25°C