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Nullifire FF197

A modified, single component, fire rated polyurethane semi-rigid foam used to seal linear gaps through fire rated areas of a building. Nullifire FF197 has excellent adhesion to most building materials such as wood, brick, stone, cement, plaster, polystyrene, cable sheaths, metals, plastics and firmly sets in approximately one hour.

Fire resistance:

Nullifire FF197 has excellent uneven gap filling properties and bonds to most common building materials. This product acts as a fire seal for up to 4 hour fire rating, tested to the latest British and European standards BS EN 1366-4 and DIN 4102-1 (B1) or for longer periods when used in conjunction with Nullifire M701 intumescent acrylic or M703 silicone sealant.


  • Bulk filling of irregular gaps and voids.
  • Outstanding fire resistance even without capping.
  • Quick and easy installation.
  • Excellent adhesion to most substrates.
  • Good smoke sealing, acoustic and insulation properties.
  • Service temperature: -40 to +90°C.

General information

Uniclass 2015

Pr_30_31_76_41 Intumescent foam fillersPrimary


P12/335 Intumescent foam

P12/36 Intumescent foam

Specification data - Intumescent foam fillers

Product Reference

Nullifire FF197

Standard product features



Technical properties:

  • Acoustic rating (to BS EN ISO 140-3): Up to 41 dB.
  • Fire performance (to BS EN 1366-3, BS EN 13501-2): Up to four hours.
  • Loading time: 24 hours.
  • Shear strength: 80 kPa.
  • Tack free: 10 minutes.
  • Tensile strength: 103 kPa.
  • Thermal conductivity: 36 mW/m.k.

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