FM 200 systems are filled with HFC227ea (heptaflouropropane) commonly known under the trade names Fm200 and FE-227. It has been universally accepted as the most suitable extinguish-ant to supersede Halon 1301. It gives superior extinguishing performance, is an environment friendly agent and is safe to use in manned areas. Stopping the fire in these critical first few seconds can save thousands of pounds worth of damage to equipment and consequent loss of production.