FS703 Intusil is a low modulus, neutral cure, silicone sealant, suitable for linear gaps sealing in order to reinstate the fire performance in compartment walls & floors.

FS703 is suitable to fire seal joints in compartment walls and floors:

  • Static linear joints (masonry to masonry/rigid wall/rigid floor/flexible wall)
  • Window & door joints (masonry to timber/steel)


  • Up to 4 hours fire resistance – Tested to EN 1366-4
  • Tested in gaps 10 – 220 mm
  • Ideal for joints in flexible walls, rigid walls & floors, windows & door frames
  • Airtight up to 600 Pa
  • Superior elasticity
  • Excellent tooling properties
  • UV & weather resistance