FS703 Fire Resistant Silicone Sealant

Product Finder

Talk to our team

FS703 is a low modulus, neutral cure silicone sealant. Suitable for use within linear gap seals in both walls and floors, FS703 will reinstate compartment lines where discontinuities, breaches or movement gaps have been left.


FS703 is suitable to fire seal joints in compartment walls and floors:
- Static linear joints (masonry to masonry/rigid wall/rigid floor)
- Window & door joints (masonry to timber/steel)
- Timber and steel interfaces
- Movement joints (20%) with FJ203 Fire Rope

Always read SDS, pre-application guidance and relevant application detail prior to application. Ensure the latest documents are downloaded prior to every project commencement.

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

Safety data sheet must be read and understood before use.

  • Up to 4 hours fire resistance - Tested to EN 1366-4.
  • Tested in gaps 10 - 220 mm.
  • Ideal for joints in rigid walls & floors, windows & door frames.
  • Airtight up to 600 Pa.
  • Superior elasticity.
  • Excellent tooling properties.
  • UV & weather resistance.
  • 25% Movement capability according to BS EN ISO 11600.
  • 20% movement when used with FJ203 as a weather seal.
FS703 Declaration of Performance (en-GB).pdf Declaration of Performance
NF_FS703_DOP_CE_en-GB_v1.pdf Declaration of Performance
NF_FS703_DOP_UKCA_en-GB_v1.pdf Declaration of Performance
FS703 Safety Data Sheet (en-GB).pdf Safety Data Sheets
FS703 Technical Data Sheet (en-GB).pdf TDS