FJ400 Intuspan Intumescent Joint Filler

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FJ400 Intuspan is an extremely compressable, foam based, joint filler. It consists of foam layers between high expansion intumescent layers to provide a high level of physical movement, and offer up to 2 hours integrity and insulation, with no adhesive required in most situations.

Fire Rating: 120 Minutes


FJ400 is used to reinstate the performance of fire compartment lines, both walls and floors, where construction joints require a physical movement seal and a specific fire rating. It has been tested in linear joints from 12 mm to 115 mm gap width, and is suitable for use between horizontal and vertical elements. FJ400 has 60% physical movement capability (compress and return); with the correct material set, if offers ±30% movement (30% extension, 30% compression, cold state inhouse tested). It is tolerant of very large movement and is used in areas where standard mastic joints are not suitable, such as large gaps over 35 mm, acoustic isolation joints and areas subject to regular cycles of expansion and contraction or vibration, both in compression and shear, where reliability is vital. In addition, Intuspan is particularly suitable for buildings being designed for earthquake zones or military buildings designed to withstand high ground movement shockwaves.

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

FJ400 must be mechanically restrained if used against any non fire rated element (cladding). Excessive construction tolerance should be notified to the site manager or engineer. In case or airtightness / watertightness requirement, use FS703 to the exposed face, minimum 3 mm thickness.

Safety data sheet must be read and understood before use.

  • Up to 2 hours fire performance - Tested to BS EN 1366-4 and EN 1366-3.
  • Ideal for high vibration areas, such as elevator shaft interfaces.
  • Unaffected by moisture.
  • Easy to install by hand.
  • Full dry system when used on its own.
  • Suits vertical & horizontal joints, and head of walls.
FJ400 Safety Data Sheet (en-GB).pdf Safety Data Sheets
FJ400 Technical Data Sheet (en-GB).pdf Product Data Sheets