IG-55 is one of the most popular fire extinguishing systems due to the extinguishing efficiency of its mixture of agents. It is suitable for protecting hazards when there may be people in the enclosure at the time of fire. It enables a safe evacuation, both in terms of the level of oxygen in the room and the visibility required for the evacuation of personnel, as well as ensuring the absence of chemicals in the discharge.

This agent reduces the oxygen concentration to extinguish the fire, but to a percentage suitable for occupied areas. The 50-50 mixture of Argon and Nitrogen allows the perfect distribution of the agent in the room for effective extinguishment.

It is highly recommended for class A, B and C hazards. The system operates by total flooding of the room, ensuring complete discharge in less than 1 minute.

Gielle has two variants depending on the storage pressure: IG-55 at 200 bar and IG-55 at 300 bar; this makes it possible to adapt the quantity of extinguishing agent required, to the storage space available for the cylinders. The system is optimized for the worst case conditions, all components are certified to ensure the strictest performance. These are necessary for the storage, detection, release and discharge of the agent at the right moment.

About IG 55 extinguishing agent

The extinguishing agent is a 50% mixture of ARGON and 50% mixture of NITROGEN gases. These substances are found in the atmosphere and are therefore completely ecological and environmentally harmless. The firefighting efficiency of both substances has been proven separately. When combined, we retain the properties of these agents, varying the gas flow through the area being protected.



The mixture of agents enables the balance of air density and, therefore, equal weights of these agents will be homogeneously mixed to protect the enclosure. The mixture of these agents retains their individual properties: They are colorless, odorless and tasteless. They leave no residue after discharge, are chemically neutral and therefore do not react with substances present in the room. Its mechanism of extinguishment of a fire is due to a reduction of the oxygen concentration in the hazard area to below the limits required for combustion, making it safe for use in occupied areas because it maintains the levels needed for the safety of people. In most cases, fires are extinguished when the oxygen concentration decreases from 21% to 14%.

Inert Gas IG-55 is a clean agent fire extinguishing system using an inert gas (IG-55) consisting of 50% Nitrogen and 50% Argon and is used in total flooding systems. Inert Gas, has become widely accepted as the best performing, cost effective, and environmentally friendly inert gas fire extinguishing agent, offering extended hold times and great flexibility in design. The patented pressure regulating discharge valve used in the Inert Gas, system utilises a superior valve design to automatically regulate the pressure of the extinguishant at discharge, providing an ideal discharge pressure and maintaining a constant flow rate throughout the discharge.

Features and benefits

Suitable for occupied areas
Electrically non – conductive
Chemically inert
Colourless, odourless and flavourless
No residue to clean up after the discharge
Zero Ozone Depletion Potential (ODP)
No greenhouse effect
No global warming impact
No decomposition products
No fog and no loss of post-discharge visibility
Non corrosive/toxic
Stored as a gas
Suitable for occupied areas
Excellent post-discharge visibility
Very low refill cost.
Easy to obtain anywhere in the world
Only agent approved for automatic use in manned environments
In the event of discharge, the agent is cost effective to replace
No evacuation issues
Cylinders can be remote from the risk (up to 100m)
Directional valve solutions to enable mutli-risks to be protected economically using single cylinder bank
Constant flow solution available, therefore reducing size of venting requirement
Large safety margin
Future proof – no risk of being banned
Economical installation costs

Zero Ozone Depletion Potential (ODP)
We simply borrow Nitrogen and Argon from nature. When released, they automatically return to their natural place in the environment.

Zero Global Warming Potential (GWP)
Nitrogen and Argon have no atmospheric lifetime and zero GWP, so they pose no risk to the environment.

Weight Similar To Air
The weight of inert gas agents corresponds closely to that of normal air and will evacuate a protected area slower than halocarbon agents after a discharge.

No Combustion By-Products
Inert gasses do not decompose into toxic or corrosive elements in a fire, making it a safe choice for people and assets.

No Fogging
inert gas systems is ideal for occupied spaces because escape routes remain visible during, and after a discharge.

No Residue
That means no damage to your equipment and no clean up required

Electrically Non-conductive
It is electrically non-conductive and is therefore highly recommended for protecting electrical and electronic materials.

Minimal Thermal Shock
When discharged, inert gasses cause the least amount of thermal shock (sudden temperature drop), compared to other clean agents.

Typical applications and hazards protected by inert gas fire suppression:

  • archives and libraries
  • civil and military marine
  • computer rooms
  • control rooms
  • data centers
  • educational institutions
  • electric and electronic applications
  • electrical switch rooms
  • financial centers and banks
  • floating roof tanks protection
  • generators
  • hospitals
  • hot process areas
  • laboratories
  • libraries
  • machinery spaces
  • mass transit
  • medical facilities
  • military installations
  • military storage centres
  • military vehicles
  • museums and art galleries
  • nuclear facilities
  • offices
  • offshore platforms
  • oil & gas facilities
  • pharmaceutical industry
  • power plants
  • telecommunication centers
  • wind turbines

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