Sikaflex®-521 UV is a thixotropic, elastic multifunctional sealant based on a polyurethane hybrid polymer, which cures on exposure to atmospheric moisture to form a durable elastomer.
Sikaflex®-521 UV adheres well to a wide variety of substrates and is suitable for elastic sealing and bonding.
Suitable substrates are wood, metals, metal primers and paint systems (two-component), ceramic materials and plastics.
ADVANTAGES
Resistant to aging and atmospheric exposure
Adheres well to a wide range of substrates without the need for special pre-treatments
Elastic
Overpaintable
Sandable
Low odor emission
Non-corrosive
High electrical resistivity
Free from isocyanates and solvents
Free from silicone and PVC
TECHNICAL INFORMATION
Color: White
Cartridge: 300ml
Hardening mechanism: atmospheric humidity
Density (uncured) (CQP 006-4): approx. 1.4 kg/l
Non-flow properties (thixotropy) (CQP 061-1): Good
Application temperature: 5 to 40 °C
Volumetric shrinkage (CQP 014-1): approximately 2%
Shore A hardness (CQP 023-1 / ISO 868): approx. 40
Tensile strength (CQP 036-1 / ISO 37): 1.8 N/mm
Elongation at break (CQP 036-1 / ISO 37): approx. 400%
Tear resistance (CQP 045-1 / ISO 34): 5.5 N/mm approx.
Glass transition temperature (CQP 509-1 / ISO 4663): approx. -50°C
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