Sikaflex 521UV 300ml - black

Chemical basis: Silane-terminated polymer (STP)
Color (CQP001-1): Black

Curing mechanism: moisture curing
Density before hardening: 1.4kg/l

Stability: good
Application temperature: from 5 to 40°C

Skin formation 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 strength (CQP045-1 / ISO 34): 5.5 N/mm

Shelf life (CQP016-1): 12 months when stored below 25°C

Weatherproof STP adhesive and sealant with a broad adhesion spectrum

Sikaflex®-521 UV is a one-component, weather-resistant STP adhesive and sealant with good adhesion to a wide range of substrates, such as metals, ABS, PC, FRP, and wood, where no special pretreatment is usually required. This universal product is suitable for interior and exterior waterproofing.

Resistant to aging and atmospheric agents
Good adhesion on a variety of substrates without special pretreatment
Isocyanate and solvent free

Product benefits

Resistant to aging and atmospheric agents
Good adhesion on a variety of substrates without special pretreatment
Isocyanate and solvent free
Repaintable
Grindable
Low odor

Application

Sikaflex®-521 UV adheres well to a variety of substrates and is suitable for permanent, elastic sealing and bonding. Suitable substrates, including wood, include metals, primers and lacquers (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 susceptible to stress cracking. Preliminary tests should be performed with original materials to avoid stress cracking. This product is suitable for experienced users only. To ensure adhesion and material compatibility, preliminary tests should be performed with original materials and in their respective conditions.