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Nullifire FF177

A modified, single component, fire rated polyurethane foam used to seal linear gaps. Nullifire FF177 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 FF177

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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