IG-541 (Inergen)

IG-541 (Inergen) is an inert gas comprising of 50% Nitrogen, 42% Argon & 8% Co², it is naturally present in the atmosphere, therefore its green-house effect is nil and its ozone layer depletion potential is zero. It is chemically inert, non-conductive, colourless, odourless and flavourless. IG-541 (Inergen) is non-corrosive and may be used at normal temperatures with such materials as nickel, steel, stainless steel, copper, brass, bronze and plastics. IG-541 (Inergen) suppression systems are based in the principle of reducing the oxygen concentration inside the protected hazard. The oxygen concentration is minimized by the application of IG-541 (Inergen) until it reaches a level where combustion is no longer supported. Each system is designed so as to decrease oxygen to a specific level. When discharged, IG-541 (Inergen) is quickly and uniformly distributed within the enclosure, achieving design concentration in 60 seconds.


It is used as a pure gas or as a component with other refrigerant gas mixtures in:

  • Clean Rooms

  • Computer Suites

  • Operation Rooms

  • Control Rooms

  • Substations

  • Generators

Product Features and Benefits

Suitable for occupied areas.

Electrically non – conductive.

Chemically inert.

Colourless, odourless and flavourless.

No residue to clean up after the discharge.

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 multi-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.

Physical Property

  • 34.0
  • -196
  • 39.9%
  • 45.7%
  • 43%
  • 52%
  • 0
  • 0

Quality Index

  • 0.085 lb/ft3 (1.36 kg/m3)
  • 1.1 (Air = 1)