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Fire Resistant Mortar

High Strength Fire Resistant Mortar - CE Marked

High Strength Fire Resistant Mortar - CE Marked | Shop At Stormflame
High Strength Fire Resistant Mortar - CE Marked | Shop At Stormflame
High Strength Fire Resistant Mortar - CE Marked | Shop At Stormflame
High Strength Fire Resistant Mortar - CE Marked | Shop At Stormflame
High Strength Fire Resistant Mortar - CE Marked | Shop At Stormflame

High Strength Fire Resistant Mortar - CE Marked

£29.44 £24.53 (ex. VAT)
A High strength fire resistant mortar | For use on rigid floors or walls | High strength and load bearing properties | Easy to mix and for internal use

FREE DELIVERY on orders over £600 (£500 ex. VAT)*
*excluding Boards, Batts, Mortar products and the following postcodes IM, HS, ZE, JE, GY, KW, FK, PH33 or AB


Key Points:

  • Suitable for fire protecting large span openings in rigid floors and walls.
  • UL-EU Accreditation.
  • Fire Resistance testing to EN1366-3:2009.
  • Fire Classified in accordance with EN13501-2.
  • High strength and load bearing properties.
  • To reinstate fire resistance through walls and floors.
  • Easy to mix.
  • For internal use.
  • Please Note: NOT Suitable for Pizza Ovens, BBQ Bases, any types of ovens, fire places etc.


Astro HS (High Strength) Compound is a Gypsum based mortar material used to reinstate the fire resistance performance of floor and wall constructions where apertures exist for the penetrations of multiple services. Astro HS Compound, once cured has excellent load bearing capabilities and can be installed in large span openings.

Astro HS Compound can be installed across a variety services and substrates including:

  • Rigid Floors
  • Rigid Walls
  • Multi-Service penetrations
  • Blank Openings
  • Head of Walls


  • Large unsupported spans
  • No shrinkage
  • Easy to mix
  • High strength and load bearing properties
  • Versatile workability range
  • Provides smoke seal

Areas of Use:

  • To reinstate fire resistance through walls and floors
  • Multi-Service penetrations
  • Loadbearing seals
  • Large Span openings
  • Prevention of air leakage
  • Maintains Acoustic performance
  • Assumed working life 25 years
  • For internal use


Description Result
Density Loose Bulk 950kg/m3
Density Wet Cast 1850kg/m3
Thermal Conductivity 0.45 W/m °C
Colour Off White
Packaging 20kg bags
Shelf Life 12 months if stored in accordance with storage conditions.
Number of 20kg Bags per m2 at 100mm thick seal depth
Astro HS Compound 6


  • Available in 20kg bags.


We have technical representatives who provide assistance in the selection and specification of the products on this site and should be consulted for exact installation and product suitability. Ensure an early engagement with ourselves, designers, main contractor and specialist installers before any installation. Other trades and/or manufacturers may need to be consulted. For in-depth information, specification and technical advice please call our Head Office on Tel: +(0)1329 841416 or email


All interested parties, designer, specifier, main contractor and specialist installers should provide access to allow the fire stopping seals to be regularly inspected and maintained, as well as records kept of such maintenance at minimum periods of 12 months, as required by the Regulatory Reform Order, and repaired if necessary. Reference should be made to ASFP TGD 17 Code of Practice for the Installation and Inspection of Fire Stopping.


It is vital that those entrusted to design or install a fire stopping product have the necessary levels of competence to undertake the task professionally and thoroughly. The level of competency required will be commensurate with the expected complexity of the building. All designers must eliminate, reduce or control foreseeable risks that may arise during installation, construction or maintenance when preparing or modifying designs. Clients should ensure that the principal designer and principal contractor carry out their duties under CDM regulations. The ASFP foundation course in passive fire protection provides essential knowledge as part of demonstrating competency and understanding in this key fire protection specialism.

Additional Notes:

Please refer to the ETA/UL-EU sheet for fields of application for this product. For further information on installation requirements please refer to the manufacturer of the services and the wall/floor specification to ensure the compatibility of this product, if in doubt please contact the technical team with services and wall/floor specification on Tel: +(0)1329 841416 or email

Download and review any of the following information:


Certification/Fire Test Reports:

CE InformationCE Marked Documents
'DoP's are 'Declaration of Performance'
'CoC's are 'Certificate of Constancy of Performance'
'TDS' are 'Technical Data Sheet'
'ETA' European Technical Assessment Sheet

ul-eu_certification'UL Documentation' are 'UL - EU Certificate'

  • Product Code:
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