Date: Thu, 14 Jul 2011 08:59:22 -0400
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From: Don Abramowitz <dabramow**At_Symbol_Here**BRYNMAWR.EDU>
Subject: Re: Hydrogen Peroxide solutions and fire extinguishers

< div style='font-family: Times New Roman; font-size: 12pt; color: #000000' >Let me start with the caveat that I don't know much about this. 

That said, I would expect an ABC extinguisher to knock down flames from such a fire, but it wouldn't address the source.  That is, concentrat ed hydrogen peroxide in contact with a fuel will oxidize, heat up, ignite b y itself and burn rather vigorously with all that oxygen.  Seems to me that once the ABC agent knocks down the flame, there's nothing to keep it from reigniting.  This may be a case where water, applied in a spray p attern if there's a flammable liquid involved,  would be useful, as it would dilute the H2O2 and cool down the mixture.  The combination of ABC followed by water might also work.   A type K extinguisher, w hich contains aqueous potassium bicarbonate solution, has a spray nozzle, a nd is intended for hot grease fires in kitchens, just might be ideal.
CO2 probably wouldn't work since the fire has its own oxygen source.  ;

This might make for some interesting small scale, outdoor experim entation at your next fire extinguisher training session (after class is di smissed).

                      & nbsp;              Don

Can anybody tell me if type ABC fire extinguisher can be used for Hydrog en
Peroxide solution related fire instead of type A fire extinguisher?  Is there a
critical concentration above which ABC extinguisher be comes useless or

Thank you.

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