Sikaflex®-521 UV adheres well to a wide variety of substrates and is suitable for elastic sealing and bonding. Suitable substrate materials include timber, metals, metal primers and paint coatings (2-component systems), ceramic materials and plastics.
This multipurpose product is suitable for internal and external sealing applications. Seek manufacturer’s advice and perform tests on original substrates before using Sikaflex®-521 UV on materials prone to stress cracking. This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.
- Ageing and weathering-resistant
- Bonds well to a wide variety of substrates without the need for special pre-treatment
- Isocyanate- and solvent-free
- Can be overpainted
- Can be sanded
- Low odour
- Brand: Sikaflex
- Tube size: 300ml / 410g
- Colour: White
- Chemical base: Silane Terminated Polymer
- Cure mechanism: Moisture-curing
- Density (uncured) depending on colour: 1.4 kg/l
- Non-sag properties: Good
- Application temperature ambient: 5 ─ 40 °C
- Skin time (CQP019-1): 30 minutes A
- Curing speed (CQP049-1): (see diagram)
- Shrinkage (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 propagation resistance (CQP045-1 / ISO 34): 5.5 N/mm
Service temperature (CQP513-1)
- -50 ─ 90 °C
- 24 hours: 140 °C
- 1 hour: 150 °C
- A) 23 °C / 50 % r.h.
- B) storage below 25 °C