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what is avd


Aqueous Vermiculite Dispersion (AVD) fire extinguishing agent is a new, revolutionary technology that has key benefits over existing solutions utilising fixed and portable delivery techniques.

AVD is an aqueous dispersion of chemically exfoliated Vermiculite that can be deployed as mist or foam depending on the required application.

Vermiculite is the name given to a group of hydrated laminar-iron magnesium silicates. Raw vermiculite consists of thin, flat flakes containing microscopic layers of water.

When Vermiculite is exfoliated either thermally or chemically, the microscopic layers of water are removed and this either causes expansion (thermally exfoliated) or creates microscopic, individual platelets that are freely suspended in water (chemically exfoliated).

AVD can be used in a Misted or Foamed format depending on the application and we have tested the following deployment systems:

  • Portable Extinguisher Bottles
  • Back Pack Extinguishers
  • Trolley Based Extinguishers
  • Fire Service Pump Systems
  • Fixed Installations


  • Vermiculite is a naturally occurring mineral that is exempt from REACH regulations.
  • It is chemically and physically inert, releasing only steam when exposed to raised temperatures rendering it sterile.
  • Non toxic to:
    • Aquatic living organisms plants and animals
    • Soil organisms
    • Aerobic plants, organisms and animals
    • Anaerobic plants, organisms and animals


While every reasonable effort is made to ensure that the information provided in this document is accurate*, no guarantees for the accuracy of information are made. Dupré’s website and material data relating to information, products or services (or third part information, products and services) is provided ‘as is’. It is provided without representation or endorsement and made without warranty of any kind, whether express or implied, including but not limited to the implied recommendations or warranties of satisfactory quality, performance or fitness for a particular purpose, non infringement, compatibility, security or accuracy.

*The technical data provided herein reflects typical indicative results of testing of products under controlled conditions, to provide the best information to allow end users, specifiers, installers, contractors, retailers and alike to determine the suitability of Dupré products for intended application.