Nullifire (Firetherm) FS703 Intusil Fire Resistant Silicone Sealant, a fire-stopping sealant designed for aggressive exterior use on high-sheen surfaces (glass, aluminium) and in high-movement joints for up to 50% movement. Suitable to fire seal joints in compartment walls and floors such as masonry to masonry, masonry to timber, masonry to steel - see the description below for a list of suitable surfaces and substrates.
Up to 4 hours fire resistance - Tested to EN 1366-4
Tested in gaps 10 - 220 mm
Ideal for joints in flexible walls, rigid walls & floors, windows & door frames
Airtight up to 600 Pa
Excellent tooling properties
UV & weather resistance
20% Movement tested
Black and grey colours available on request
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Nullifire FS703 Intusil Fire Resistant Silicone Sealant provides a fire-stopping seal around high movement joints and is ideal for use in external aggressive environments, with high adhesion that applies to high-sheen surfaces like glass and aluminium. The mastic insulates and resists fire for up to 240 minutes with a water-resistant seal that is unaffected by moisture, offering a movement capability of up to 50%.
Intusil cures at a rate of 1 mm per day and cannot be readily over-coated.
Sealing gaps and cracks in fire barriers and around services can be critical to slowing the spread of smoke and fire, saving lives with more time for evacuation. Use FS703 Intusil in the following applications:
Block to block
Block to steel
Concrete to timber
Block to concrete
Floor movement seals
Head of wall movement seals
Slab edge seals
Service movement seals
Static linear joints (masonry to masonry/rigid wall/rigid floor/flexible wall)
Window & door joints (masonry to timber/steel)
Movement joints (20%)
2:1 ratio wall 240 minutes integrity; 240 minutes insulation
2:1 ratio floor 240 minutes integrity; 90 minutes insulation
3 mm over 100 mm Firetherm Backer 240 minutes integrity; 240 minutes insulation; 30% movement
10mm angled fillet to Intubatt edges or full depth plus fillet around services
Linear gaps up to 50 mm x infinite length
10 mm wide seal - 3.25 m approx.
15 mm wide seal - 1.35 m approx.
20 mm wide seal - 0.78 m approx
Tested at Exova BM Trada to BS EN 1366-4, BS EN 1366-3, BS 476/20/22
Third party accredited by Exova Warrington Fire, certificate number CF 5340
IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contactedto 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.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.
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.
An extensive range of accessories and ancillary products for use with Nullifire (Firetherm) systems, helping the installation and application of firestopping products. Refer below to see the full range.
To qualify for Express (1-3 day) shipping, basket value must exceed £75.00 + VAT. Orders below this amount will only be available on Economy...