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Flexible fire resistant pillows for either temporary or permanent fire stopping of service penetrations for fire resistance of up to 4 hours.



Firebags consist of dust free coated glass fibre bags filled with inorganic fillers, expansion agents and special fire retardant additives. Placed in service penetrations through fire rated walls and just as easily removed, to provide temporary or permanent fire stops. They are especially suitable where frequent cable changes are expected, for example, in computer and communications installations. Fire protection during construction work can be as important as even openings partially filled with Firebags will have a significant baffle effect in the prevention of relatively minor outbreaks of fire spreading throughout the building.



Firebags are available in 3 configurations. Each bag is about 350mm long and varies in width from a maximum of l00 mm.

Firebag 720 The standard size, 720g in weight.
Firebag 250 Lower density, 250g in weight, to allow for folding the bag to seal smaller openings or between cables.
Firebag 60 A narrow'sausage'shaped bag for use inside trunking and around fibre optic cables.



The versatility of the Firebag system allows it to be used in a wide variety of applications in both new build and refurbishment.

  • Inside trunking
  • Fire seal to wall cavities
  • Temporary sealing of service penetrations during construction work
  • In combination with permanent seals to form removable accesses.
  • Underfloor compartmentation.
  • Around fibre optic cables.



Firebags function by expanding under heat exposure. This expansion will close even the most minute crevices between bags, structure and penetrating services and will create an integrated density of seal as it hardens into a solid, homogeneous smoke tight mass thus preventing the filling material from running out even after the glass fibre textile outer cover has been damaged or has melted.


Method of action

(i) at approximately 130 degrees C the various components of the bags start to glue up and stick together so that their contents cannot run even if the bags are damaged.

(ii) at approximately 280 degrees C the contents of the bags begin to expand (720 bags by 15%, 250 bags by 40%) so that even the smallest remaining spaces are closed tight.

(iii) at approximately 700 degrees C a 'ceramic reaction' causes the contents to harden into a solid block mechanically so strong that it will withstand damage caused by failing debris or the high pressure stream from a firehose.



Wall penetrations:

A single width of Firebags laid with lapped joints will achieve a 4 hour rating.

Floor penetrations:

Where services penetrate a floor slab the fire rating of the seal will depend on the total depth of Firebags used.

1 and 2 hour:

Two layers of Firebags laid flat with lapped joints on a 12 gauge 50mm square wire mesh screen. Additional bags should be placed around services.

4 hour:

Four layers of Firebags laid flat with lapped joints on a 12gauge 50mm square wire mesh screen. Additional bags should be placed around services.

Large openings can be reduced using Firegrout mortar or Firewall panels.


For added security and to prevent Firebags being removed and not replaced they can be ordered with eyelets which are then wired together with stainless steel wire.



Firebags can be supplied direct to contractors who will install in accordance with Tayfire (International) Ltd. guidelines, or may be installed as part of a supply and install service arranged by Tayfire (International) Ltd.



Firebags manufactured under ISO 9001 "Quality Systems" Fire integrity for up to 4 hours has been fully tested to BS 476: parts 20 and 22: 1987 "Methods of determination of the fire resistance of non loadbearing elements of construction".



Tayfire (International) Ltd. offer a full technical advisory and fire stopping design service.



Further information on a wide range of otherfire protection products is available from the company. These include intumescent coating systems, fire sealants and fire barriers.


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Fig 1: Firebags installed on a wire mesh system which allows a section of a larger seal to be opened easily for the inclusion of future planned services while maintaining a secure temporary seal.



Fig 2: Method of installation of a 1 hour firebag seal with Firebags laid flat in overlapping fashion



Fig 3: A section of a seal, partially filled with firebags will still have a significant baffle effect in the event of fire



Fig 4: Firebags installed around telecommunication fibre optic cable in ducting

























TayFire (International) Ltd





Tel:  +44 (0)1821 641 007

Fax: +44 (0)1821 641 008