A strong, fast-fit flexible fire seal for curtain wall, slab edge and vertical cladding applications, offering up to four hours integrity and two hours insulation.

Intubatt 3 is supplied pre-configured, ablative coated on a single side and factory cured. It is a strand and binder orientated rock mineral wool fibre compressible slab, utilizing a modified polymeric ablative coating to provide a fire and smoke seal.

Features and benefits:

  • Tested at Exova BM Trada to BS EN 1366-4, BS 476-20, BS 476-21 and BS 476-22.
  • Low cost and simple to install.
  • Fully tested at Exova BM TRADA up to four hours' integrity.
  • Easy to cut.
  • Service movement up to 7.5%.
  • Fully identifiable using Optifire.
  • Service capable.


Intubatt 3 is specifically designed as a strong, fast-fit curtain wall/ slab-edge/ vertical cladding flexible fire seal. The system requires no fixings for horizontal gaps up to 200 mm (Z-Clips are required for use on non-fire rated or flexible claddings).

Standard product features


Strand and binder orientated rock mineral fibre.


1 mm thick Firetherm ablative coating one side, incorporates Optifire traceability.


Off white.

Size (w x l):

600 x 1200 mm.


100 mm.


8 kg (±0.5 kg, 0.72 m²).


100 kg/m³.

Maximum openings:

Facade and internal movement and slab edge seals up to 600 mm (maximum gap width) ±7.5% movement.


  • Fire: Up to four hours' integrity and two hours insulation.
  • Acoustic: Up to 52 dB (floor slab), limited by the substrate.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-70/427 Mineral wool fire stopping

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Firetherm Intumescent and Insulation Supplies Ltd


+44 (0)1322 551010

Product reference

Intubatt 3



Manufacturer details

Unit F,
Acorn Industrial Park,
Crayford Road,
Kent, DA1 4FT
Tel +44 (0)1322 551010
Fax +44 (0)1322 552727
NBS Plus
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