Nullifire FS703 Neutral Cure Fire Rated Silicone

We no longer stock this product, but can recommend Firetherm Intusil as a great alternative.



We no longer stock this product, but can recommend Firetherm Intusil as a great alternative.

Nullifire FS703 Neutral Cure Fire Rated Silicone is a single-part alkoxy-based fire resistant, elastomeric, neutral cure silicone sealant. Provides up to 4 hours fire protection at internal and external building gaps and movement joints. 

FS703 can be used for joints in compartment walls and floors, gaps between frames and structures, at junctions of different materials. 


  •  Masonry to masonry
  •  Masonry to timber
  •  Masonry to steel 

Features & Benefits

  • Can achieve up to 4 hours joint fire resistance tested in accordance with EN 1366-4
  • CE Marked ETAG 026 and Classification 13501:2
  • Suitable for gaps up to 50 mm wide
  • Assumed working life of 10 years (ETAG 026)
  • Certified 3rd party accreditation Air Permeability 600Pa EN1026 Seal ratio at 2:1
  • Neutral cure silicone sealant 

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 ConditionsWe 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.

It is your responsibility to read the Product Data Sheets (available below) before you place an order and prior to application of the product. The content of this website is our best recommendation and is not advice. Coverage rates quoted are approximate, you agree that coverage depends on the condition of the substrate, surface absorption, texture and application method. We ALWAYS recommend a trial area is coated to ensure the product meets your requirements before use.

Product Details

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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