General Information
P/N 06-237620-001 1-7 June 2020
1-4.3 IG541 (Nitrogen, Argon, and Carbon Dioxide)
Natura IGS systems with IG-541 are fixed fire extinguishing systems that use an inert gaseous
mixture of 52% Nitrogen, 40% Argon, and 8% Carbon Dioxide (IG-541), UN number 1956.
Specification for IG-541 is a Nitrogen/Argon/Carbon Dioxide 52%/40%/8% ratio by volume.
The tolerance of the mixture in air is as follows:
• Nitrogen: 52% +/- 4 %
• Argon: 40% +/- 4%
• Carbon Dioxide: 8% + 1%/ - 0%
1-4.3.1 Purity
Each element shall conform to the following purity specification:
Argon:
• Argon greater than or equal to 99.99%.
• Oxygen less than or equal to 10 ppm.
• Water less than or equal to 10 ppm.
Nitrogen:
• Nitrogen greater than or equal to 99.7%
• Oxygen less than or equal to 10 ppm.
• Water less than or equal to 10 ppm.
Carbon Dioxide:
• Carbon Dioxide greater than or equal to 99.7%
• Oxygen less than or equal to 10 ppm.
• Water less than or equal to 10 ppm.
Note: Only principal contaminants are shown. Other measurements may include: Carbon
Monoxide, Carbon Dioxide, Nitrogen Oxide, and Nitrogen Dioxide most < 20 ppm.
Figure 1-5. IG-541 Pressure/Temperature Curve Isometric Diagram for 200 bar, U.S. Customary Units
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