Sikaflex®-821 FR

Fire-rated interior sealant for rail applications

Sikaflex®-821 FR is an elastic 1-component polyurethane fire-retardant sealant that cures on exposure to atmospheric humidity. It is used for internal joints in the rail industry where the hazard level HL1 or HL2 of the European rail fire standard EN 45545-2 is required.  

  • Fire-retardant
  • Passes EN 45545-2 / R22, R23 HL2
  • Free of solvents and PVC