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Halon??
Not correct looks like a standard B C To me.
Rickyb
Both Halon 1211 (a liquid streaming agent) and Halon 1301 (a gaseous flooding agent) leave no residue after use after use. Halon is rated for class “B” (flammable liquids) and “C” (electrical fires), but it is also effective on class “A” (common combustibles) fires. Halon 1211 and Halon 1301 are low-toxicity, chemically stable compounds that, as long as they remain contained in cylinders, are easily recyclable.
I remember having halon tanks in some military vehicles. it's, I suppose, the safest and most effective way to eliminate an electrical fire without leaving residue that could damage electronic components. Some kind of powder was used for engine compartments (man, that stuff went EVERYWHERE when they popped). Never had the Halon ones go off though. There was a widespread rumor that they displace oxygen and, if you're in a closed cabin (as i was) you've gotta get out quick! But according to a halon manufacturer that isn't actually true. with all that said, i dont know how effective they are in open areas where the stuff can't fill up the room, or how safe they are in closed areas where they can. I'm to understand, however, that they are indeed "good to go." but we also had asbestos mittens.
I'd recommend testing that can out on an open flame. You can still get refills for halon to my understanding (maybe figure out where first) you just can't get a new halon extinguisher.
EDIT: provided that yours is the streaming agent, I assume you should be "good to go." I've seen your posts before, Zardiw, I'm confident you know what you're doing. Give 'em hell!