Fire extinguisher residue

[James H Frazee]

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Robert,

The first step is to determine which types of extinguishers were used in =
this inane act.  Following is information from fireextinguisher-101.com. =
 Note that BC types leave a corrosive residue and that ABC types leave a =
sticky residue.  Good look and keep up posted on your =
experience/success.
  Here are the most common types of fire extinguishers:

       a.. Water extinguishers or APW extinguishers (air-pressurized =
water) are suitable for class A fires only. Never use a water =
extinguisher on grease =
fires<http://www.fire-extinguisher101.com/using.html>, electrical fires =
or class D fires - the flames will spread and make the fire bigger! =
Water extinguishers are filled with water and pressurized with oxygen. =
Again - water extinguishers can be very dangerous in the wrong type of =
situation. Only fight the fire if you're certain it contains ordinary =
combustible materials only.=20
          b.. Dry chemical extinguishers come in a variety of types and =
are suitable for a combination of class A, B and C fires. These are =
filled with foam or powder and pressurized with nitrogen.=20
            a.. BC - This is the regular type of dry chemical =
extinguisher. It is filled with sodium bicarbonate or potassium =
bicarbonate. The BC variety leaves a mildly corrosive residue which must =
be cleaned immediately to prevent any damage to materials.=20
            b.. ABC - This is the multipurpose dry chemical =
extinguisher. The ABC type is filled with monoammonium phosphate, a =
yellow powder that leaves a sticky residue that may be damaging to =
electrical appliances such as a computer=20
      =20

  Dry chemical extinguishers have an advantage over CO2 extinguishers =
since they leave a non-flammable substance on the extinguished material, =
reducing the likelihood of re-ignition.=20

    a.. Carbon Dioxide (CO2) extinguishers are used for class B and C =
fires. CO2 extinguishers contain carbon dioxide, a non-flammable gas, =
and are highly pressurized. The pressure is so great that it is not =
uncommon for bits of dry ice to shoot out the nozzle. They don't work =
very well on class A fires because they may not be able to displace =
enough oxygen to put the fire out, causing it to re-ignite.=20
  <http://www.fire-extinguisher101.com/using.html>CO2 extinguishers have =
an advantage over dry chemical extinguishers since they don't leave a =
harmful residue - a good choice for an electrical fire on a computer or =
other favorite electronic device such as a stereo or TV.

        It is vital to know what type of extinguisher you are using. =
Using the wrong type of extinguisher for the wrong type of fire can be =
life-threatening.=20

  These are only the common types of fire extinguishers. There are many =
others to choose from. Base your selection on the classification and the =
extinguisher's compatibility with the items you wish to protect.=20


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