FM200® (HFC 227ea), chemically as Heptafluoropropane is a colourless gas which is liquified under pressure for storage. Like Halon 1301 it has a low toxicity level and is superpressurised with Nitrogen to 24.8bar (360psi). It rapidly extinguishes most commonly found fires through a combination of chemical and physical mechanisms.
FM200® has been found to be less toxic than Halon 1301, which makes it safe for use in the fully automatic mode in occupied areas.
Typically FM200® requires a design concentration of 7%, which is well below the 9% No Observable Adverse Effect Level (NOAEL) on cardiac sensitisation. The NOAEL for Halon 1301 is only 5% (the same as its design concentration).
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