PyroJoint - Acoustic / Intumescent Expansion Joint Seal

PyroJoint - Acoustic / Intumescent Expansion Joint Seal
Product Code: FR100 - FR290
Availability: Estimated 1 week
Download Description: For Registered Users Only
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This product has a maximum quantity of 50
This product has a minimum quantity of 10

PyroJoint - Acoustic / Intumescent Expansion Joint Sealer

pyrojoint intumescent expansion joint foam

  • BS 476: Part 20
  • PR EN1336-4
  • Up to 4 hours' fire resistance
  • Weatherproof & water resistant
  • Suits internal/external applications
  • Cost effective to install
  • Performance temperature between -30°C to +130°C.

Areas of use

  • Between steelwork and blockwork where deflection and movement could occur
  • In movement joints with blockwork walls and floors
  • Top of wallhead to the underside of the floor - although gaps could be uneven - PyroJoint Intumescent Expansion Joint Seal is extremely compressible and should accommodate any irregularities
  • Around mechanical services such as pipes and ductworks etc.
  • PyroJoint is an extremely versatile filler materia


The sub-division of compartments in a building - if effectively fire stopped - will prevent the spread of fire and smoke through fire resisting and separating elements. All expansion and movement joints in a fire separating wall and floor must be fire stopped with a proprietary material that will accommodate the required movement while providing the necessary degree of fire integrity.

The PyroJoint Intumescent Expansion Joint Seal is manufactured using various thicknesses of flame retardant open cellular foam, fire rated to achieve Class 1 and Class 0 when tested to BS476 Part 20. Expandable, graphite based intumescent is factory sprayed onto both sides of the foam, forming a compressible fire resistant joint filler which is resistant to moisture attack.

The graphite based material starts to intumesce around 115°C on the fire side of the joint whilst the fire rated foam gradually compresses allowing the expanding mass of intumescent graphite to totally seal the opening.

This carbonaceous char formed by the graphite will prevent the spread of fire through the joint thus ensuring the integrity of the compartment wall/floor is maintained.

From an acoustic point of view the foam layer used is our ductfoam. This product is designed to help maintane, as close as possible, the acoustic integrity of the wall in question. Actual results will depend on a number of factors i.e.partition length, depth of expansion joint, compression of material, depth of material etc etc so will vary from project to project. 

intumescent expansion foam


intumescent expansion foam

Example of options

1 no. PyroJoint 20/120FR fire sealing a 15mm gap for 2 hours
2 no. PyroJoint 20/60FR fire sealing the same size gap for 2 hours


Installation is easily effected by compressing the pre-cut PyroJoint Intumescent Expansion Joint Seal and inserting into the joint and releasing. A minimum compression of 15% per thickness of material is recommended to ensure a rigid friction fit although it can be compressed to 50%.

Supplied in 1m lengths that can easily be butted together. Cutting can be done with a fine toothed hacksaw, making sure that the ends are cut square.

If you have very rough concrete joints then we can supply a slightly different intumescent strip material which is designated 'FR-L'

Gap width Product reference for gap size in relation to fire resistance
  FR 60 Mins Part Code FR 120 Mins Part Code
10mm 10/60FR FR100 10/120FR FR200
20mm 20/60FR FR110 20/120FR FR210
30mm 30/60FR FR120 30/120FR FR220
40mm 40/60FR FR130 40/120FR FR230
50mm 50/60FR FR140 50/120FR FR240
60mm 60/60FR FR150 60/120FR FR250
70mm 70/60FR FR160 70/120FR FR260
80mm 80/60FR FR170 80/120FR FR270
90mm 90/60FR FR180 90/120FR FR280
100mm 100/60FR FR190 100/120FR FR290

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