Nullifire FS703 Fire Resistant Silicone Sealant

Nullifire FS703 Fire Resistant Silicone Sealant

FS703 is a low modulus, neutral cure, silicone sealant, suitable for linear gaps sealing in order to reinstate the fire performance in compartment walls & floors. Provides up to 4 hours fire protection at internal and external building gaps and movement joints.

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) Movement joints (20%)

Do not use around CPVC pipes; for this specific application, please use FS719 HP Blue for CPVC. If used around Pegler X-Press Carbon Steel pipes, the pipe manufacturer should be consulted, and their recommendations followed.

Key Features:

  • 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.
  • Minus 20% movement tested.

Base: Silicone

Curing: RTV Curing

Viscosity: Gun applied

Packaging: 310 ml cartridges and 600ml foils in white. Grey and Back also available to order subject to minimum order quantities.

Technical Data Sheet

Declaration of Performance

Nullifire Fire Stopping Brochure

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