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Intumescent Mastic by Astroflame
Intumescent Mastic by Astroflame Intumescent Mastic by Astroflame Intumescent Mastic by Astroflame

Intumescent Mastic - CE Marked

Astroflame Intumescent Mastic - CE Marked

Intumescent Mastic with Acoustic Rating.

CE Marked : Certifire approval : UL-EU, UL-US Listed

Tested with metallic pipes, cables, cable bunches, Cable Trays and Cable Ladders.

Advanced intumescent formulation.

Tested to EN 1366-4:2006 AI:2010

Fire resistance testing to ASTM-E 1996, UL 2079

Fire resistance: EN 1366-3 EI 120, EN 1366-4 EI 240 and BS 476 300 mins.

Fire Classification to EN 13501-2.

Acoustic Isolation to EN 10140 to 63dB.

Air Permeability testing to EN 1026 to 600Pa - 100Pa 0.0/0.0 m3/h/m2.

Mechanical Adhesion and Tensile testing to EN ISO 8039 & EN ISO 9046.

VOC LEED 2009 EQ c41.1 5CAQ MD, Rule 1168 ASTM D2369D

Causes no known adverse effects to plastic pipes, plastic cables, sheathing or metallic components.

Joint movement capability of +/- 20%.

Highly flexible and water resistant.

Halogen free, resists fungi and vermin.

Contributes to Green Building.

310ml cartridges in Brown, Grey or Off White.

Astroflame intumescent & acoustic mastic.

CE InformationCE Marked Documents
'DoP's are Declarators of Performance
'CoC's are 'Certificates of Constancy'

DoP Astro Intu Mastic PS

DoP Astro Intu Mastic LGS

CoC Astro Intu Mastic

Astro Intu Mastic TDS

UL Documentation


An acrylic, intumescent mastic for filling gaps, joints, voids and irregular holes to maintain the integrity of fire rated structures. In a fire the intumescent material in the sealant expands to many times its original volume to stop the passage of flames via the sealed gap. 

Typical applications for intumescent mastic include:

  • Sealing gaps around fire door frames,
  • 'Bedding down' fire hoods
  • Sealing around pipes and cables that penetrate firewalls.
  • General gap filling around fire rated structures

This mastic can be used on most common construction substrates, although, for unusual substrates, we recommend that a small area is tested before full application.

Long shelf life

Independently tested to provide up to 5 hours fire resistance depending on substrates, joint  depth/width and volumetric area (see table below).

Fire resistance table for intumescent mastic.


Mastic is supplied in single 310ml cartridges or in discount packs of 12 cartridges (single colour packs).

In Brown, Grey or Off-White colour (all colours can be over-painted).

Pack Size

Our Price: £2.69

Prices include VAT.

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