Nullifire FS702 Intumastic Fire Resistant Acrylic Sealant


Nullifire (Firetherm) FS702 Intumastic Fire Resistant Acrylic Sealant, a water-based acrylic sealant which cures to give a firm but flexible fire seal. Suited for use around non-combustible services, cables, rock fibre insulated non-combustible pipes, using a  minimum depth of 25 mm. FS702 has excellent adhesive qualities and can also be used for the bonding and pointing of joints and  service penetrations in conjunction with FB750 Intubatt system.

  • Up to 4 hours fire resistance - Tested to EN 1366-4, EN 1366-3 and BS 476 Pt 20-22
  • Up to 30% movement capability (during fire test)
  • Suitable for flexible walls and rigid walls & floors
  • Used for sealing FB750 Intubatt
  • Acoustics up to 55 dB
  • Air seal up to 2,000 Pa
  • Optifire & Optifire+ unique traceability identifiers

£33.12(ex. VAT)
£39.74 (inc. VAT)
Please choose your colour
Available for Delivery (See Delivery Options Below)


Order Reference

Product Size Colour
Cartridge 310ml White
Foil Pack 600ml White
Tub 5 Litre White
Pourable 20KG White

Use Nullifire FS702 Intumastic Fire Resistant Acrylic Sealant to seal around dry internal joints, pipes and services to insulate and prevent the spread of fire and smoke for up to 240 minutes. Helping contain fires gives more time for evacuation of properties, saving lives, and may prevent more costly fire and smoke damage to a business, resulting in less downtime and faster re-opening.

Tack free between 15 minutes and an hour, the sealant can be over-painted with acrylic paints once fully cured and tools off easily with water. It may also be used in movement joints, offering a movement capability of up to 30%.


Suitable for a variety of applications:

  • Static & movement linear joints (masonry/flexible wall to masonry/rigid wall/rigid floor/flexible wall)
  • Window & door joints (masonry to timber/steel)
  • FB750 to flexible wall/rigid wall/rigid floor
  • Cold smoke seal
  • Service penetrations sealing: copper & steel pipes, cable bundles / trays / ladders (with and without FI025 Intuflex Insulation Wrap)
  • FS702 is also suitable for service movement joints (consult Technical on 0113 2455450 (option 2) or send a message to [email protected]).


  • Joint widths 0 to 35 mm linear; 30 to 150 mm movement details.
  • Depth to width ratios 1:1 walls and floors; 2:1 split wall seals.
  • Tack free time 15 to 60 minutes, depending on temperature/humidity.


  • CE marked
  • Tested in accordance with BS EN 1366-4, BS EN 1366-3 and ETAG 026
  • Fully tested for up to 240 minutes' joint fire resistance
  • Ideal for sealing low movement joints - suitable for gaps up to 50 mm wide
  • Suitable for rigid and flexible walls
  • Used for sealing FB750 Coated Fire Batts
  • Acoustics up to 61 dB
  • Air pressure tested up to 2000 Pa
  • Single sided seal tested
  • Easily paintable
  • Features Optifire technology, a unique UV technology, activated by exposing the products surface to a UV light source, which offers easy & instant product identification (white colour only).

Maximum Openings

  • Maximum wall opening 35 mm x infinite length linear gap
  • Maximum floor opening 35 mm x infinite length linear gap
  • Maximum opening in movement seal 200 mm x infinite length


  • 1:1 ratio wall 240 minutes integrity; 240 minutes insulation
  • 1:1 ratio floor 240 minutes integrity; 240 minutes insulation
  • 3mm over 100mm Firetherm Backer 240 minutes integrity; 240 minutes insulation; 30% movement.
  • 10mm angled fillet to Intubatt edges or full depth plus fillet around services.


  • 10 mm wide seal - 3.25 m approx.
  • 15 mm wide seal - 1.35 m approx.
  • 20 mm wide seal - 0.78 m approx.

Fire Testing

  • Tested at Exova BM Trada to BS EN 1366-3/4
  • Tested at Exova Warrington Fire to BS476 Pt 22
  • Third party accredited by Exova Warrington Fire, certificate number CF 578

IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and Conditions and should be applied only by an individual with the necessary expertise and experience. We will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.

Product Details

Data sheet

Water / Solvent Based
Touch Dry (at 20°C)
30 mins
UN Number

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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Nullifire FS702 Intumastic Fire Resistant Acrylic Sealant is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

All delivery costs below are excluding VAT