Sikaflex®-521 UV

Isocyanate-free, weathering-resistant sealant

Sikaflex®-521 UV is a weathering-resistant, 1-component Silane Terminated Polymer (STP) sealant that cures on exposure to atmospheric humidity. This multipurpose product  is suitable for internal and external sealing applications.  

  • Ageing and weathering resistant
  • Bonds well to a wide variety of substrates without the need for special pre-treatment
  • Can be painted
  • Can be sanded
  • Low odour
  • Isocyanate- and solvent-free
  • Silicone- and PVC-free