Mineral-based, reusable and suitable for difficult to controll metall and lithium-battery fires

The purpose of extinguishing agents is to put out burning substances under consideration of their fire class and the surroundings. They are used by fire brigades or in automatic fire extinguishing systems. They are also provided in mobile units for self-help.

Extover® fire extinguishing granulate is examined for class D fires. Problematic fire loads such as metal fires (magnesium or sodium) and lithium battery fires can be controlled and extinguished using Extover®, without any damage caused by the extinguishing agent.

Areas of application

The granulate is very well suited for use in industrial facilities, production operations, data processing centres, warehousing and transportation. Since it is an electrical insulator, Extover® is also ideal for use in the energy storage and supply sector, for example in transformer station protection. Extover® has a low dust content, tolerates frost and is easily removable.

Server rooms
Telecommunication centres
Engineering rooms
Aviation and shipping
Transportation of dangerous goods (lithium batteries)
Energy facilities
Production facilities
Tank farms

A combination of several advantages

Extover® floats on liquids and forms dense layers. The low weight simplifies handling and storage, both in stationary and mobile facilities. The granulate can be applied to the fire by hand, machine or gravity systems. Extover® combines various advantages in one product and can reduce the disadvantages of using conventional extinguishing methods.

Sprinkler systems, sprayed water systems

  • High water consumption
  • High water consumption
  • High weight (water and pipework)
  • High technical cost
  • Extinguishing agent damage (water damage)

Powder extinguishing systems

  • High technical cost
  • Extinguishing agent damage (high degree of contamination)
  • Not recommended for technical facilities
  • Not reusable

Foam extinguishing systems

  • High water consumption
  • High weight (water and pipework)
  • Very high technical cost
  • Chemical additives
  • Extinguishing agent damage (water damage)

Gas extinguishing systems

  • High pressure build-up necessary
  • Very high technical cost
  • Potentially fatal
  • Pollutant (CO2)

Extover® extinguishing agent class D for lithium fires and other metal fires

Light metals such as lithium, sodium, magnesium and aluminium are gaining importance. They are increasingly used in vehicle and aircraft construction. Their processing, transportation and storage however is a major challenge, since many light metals are highly inflammable and/or reactive. Lithium and sodium react with water even in their cold state, forming highly explosive detonating gas in combination with air.

This is why metal fires are combined in their own fire class D. The extraordinarily high temperatures that are reached trigger unexpected chemical reactions, which would never occur at lower temperatures. This means extinguishing the fire can be fatal.

Water and foam are not suitable for extinguishing metal fires. Magnesium, aluminium and titanium develop high temperatures up to 5400 degrees Fahrenheit. If water was used for extinguishing, it would be split into its components of hydrogen and oxygen – followed by a violent explosion (detonating gas reaction). This means water and extinguishing agents containing water are unsuitable.

Carbon dioxide and ABC or BC extinguishing powders are not suitable either. Due to the high temperatures, the chemically bound oxygen serves to sustain the fire. Even non-reactive substances are forced to react at these temperatures (nitration) and can be used by burning metals as a substitute for the lack of oxygen.

The extinguishing effect of Extover® on metal fires was tested and confirmed by MPA Dresden using a sodium and magnesium fire. Extover® is softly applied to the fire. The foam glass granulate surrounds the fire and suffocates it. At very high temperatures, the foam glass melts and spreads over the surface of the burning metal. This melt forms an airtight layer that crusts over as it cools, extinguishing the metal fire. Re-ignition is effectively prevented.

Confrontation with metal fires

Areas where metal fires are frequently experienced include metal processing operations, the steel industry, recycling firms, manufacturers of lithium batteries, container operations and the automobile industry along with its suppliers. Unlike sand or salt, Extover® is far easier to handle and more readily applied to the fire in correspondingly high quantities.

Metal processing trade
Steel industry
Recycling firms
Manufacturers of lithium batteries
Container operations
Automobile industry