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Nullifire FS709 HP Intumescent Sealant

A water-based graphite sealant which expands when exposed to fire

  • Provides up to 4 hours fire resistance
  • Versatile and easy to apply
  • Can be used with FB750 Intubatt Coating Batt
  • Designed to close off gaps and penetrations in compartment walls and floors
  • Eliminates requirement for pipe closers or wrap systems
  • Features Optifire+ unique traceability technology
Delivery options
Next day delivery slots available upon request. Call us on 01483 418418 for details.
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Total price

£32.90 (Ex VAT)

This item: Nullifire FS709 HP Intumescent Sealant 600ml £7.70 (Ex VAT)



Nullifire FS709 HP Intumescent Sealant is a high expansion/pressure exerting, graphite intumescent sealant. FS709 expands when exposed to fire, reinstating the fire performance of compartment walls and floors that have been penetrated. FS709 has been tested to provide up to 4 hours of fire resistance by closing off pipe penetrations in the event of a fire, eliminating the need for pipe closers or wrap systems.

Our excellent formulation also incorporates a unique identification property offering architects, specifiers, main contractors, and applicators guaranteed traceability of product on-site. Optifire technology is activated by exposing the product's surface to a UV light source, which offers easy and instant product identification. Nullifire FS709 Intumastic also features Optifire+ visible with a Nullifire detector offering lifetime identification, even after a fire.

Recommended areas of use

  • Flexible or rigid walls (100mm or wider)
  • Rigid floors (150mm or wider)
  • Can be used with FB750 Intubatt and FR230 Intucompound


  • Up to 4 hours fire resistance – tested to EN 1366-3 and EN 1366-4
  • Versatile and easy to apply
  • Can be used with FB750 Intubatt Coated Batt
  • Tested with combustible pipes up to 125mm, insulated non-combustible pipes up to 160mm, cables, cable trays and ladders (up to 500mm) and cable bundles (up to 100mm).
  • Tested in openings up to 600 x 600mm
  • Tested for use in linear gaps up to 25mm
  • Features Optifire+ for unique traceability and lifetime identification even after a fire
  • Eliminates requirement for pipe closers or wrap systems
  • No maintenance is required after installation. Routine inspection is recommended to ensure no damage.


Properties 600ml


Surface preparation:

All surfaces must be clean and sound, free from dirt, grease, and any other contamination. Check surface type is suitable for the service type, substrate, fire rating, annular space and seal depth required.


  • We recommend that the surface of substrate temperature is 5°C or above at the time of application.
  • Insert required backing material (refer to performance on backing materials), oversized to opening to ensure stability, to provide correct depth of seal
  • Using a suitable tool, cut the nozzle of the cartridge to bead size and angle required
  • Gun sealant into gap to required depth by applying an even pressure to the trigger
  • Work and tool to a smooth finish immediately with a wet profiling tool or spatula


Safety Data Sheets are provided, please read for pre-application guidance and relevant application details prior to application. 
Use in well-ventilated conditions and ensure all recommended protective equipment is worn during handling and use of this product. For full recommendations, refer to the Safety Data Sheet. 

Important information:

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

Test results

Extensive testing is what makes us the most highly qualified paint and repair manufacturer on the market. Our tests cover just about everything you might want to know about a product.

Key tests for Nullifire FS709 HP Intumescent Sealant:

  • Durability: Z1 rating, as tested by EN 13162 or EN 14303 and EN ISO 1519.
  • Reaction to fire: FB750 tests as class E when tested to EN 13501-1

Full test results can be found on the Technical Data Sheet.

Data sheets

Data sheets

Safety data sheets

Safety Data Sheet

Technical data sheets

Technical Data Sheet

Declaration of performance

Nullifire - FS709
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£7.70 (Ex VAT)

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Delivery options
Next day delivery slots available upon request. Call us on 01483 418418 for details.

Nullifire FS709 HP Intumescent Sealant

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