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Fire extinguisher life length?

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Guest joel de leon

what is the cause of foam (AFFF) portable fire extinguisher, the foam Chemical become color black during annual servicing?

 

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Assuming it's AFFF or some similar synthetic foam compound that's not the usual correct colour of the concentrate or solution, it looks like it's degraded and I would replace with fresh water and concentrate.

As to cause, I'm not sure, could be solution age, contaminated water, exposure to extremes of temperature. I've seen old solution go like this in the old days of cartridge extinguishers sometimes where the water and solution is old and there has also been a reaction with the plastic of the lining and cartridge - was there a sludge on the cartridge and diptubes?

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