Portable extinguishers expel pressurized CO2 or more commonly Nitrogen gas mixed with the "dry" extinguishing agent.
True, provided that the extinguisher is the proper type. An ABC dry chemical extinguisher would be the best extinguisher to use.
NO!!!!! Use a Dry Chemical extinguisher
NO!!!!! Use a Dry Chemical extinguisher
You would not want to use a pressure water extinguisher on any electrical fire due to the possibility of electricity being conducted through the water and injuring someone. A CO2, dry chemical or "clean agent" (e.g., "Halogenated") extinguisher would be a better choice for an electrical fire, knowing that dry chemical powder will make quite a mess.
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To put out a fire involving LPG (liquefied petroleum gas), it is important to turn off the gas supply if it can be done safely. Use a fire extinguisher suitable for flammable liquids, such as a dry chemical extinguisher. If the fire is too large to be extinguished with a portable extinguisher, evacuate the area and call emergency services for assistance.
Flammable metals often require special chemicals to extinguish, assuming there are any. So, in fact, you WOULD use a "chemical extinguisher", but probably not an ordinary dry chemical extinguisher.
Dry chemical
Assuming this extinguisher is following Australian rules, that is a dry chemical extinguisher. If this is an American extinguisher, there are no standards, only conventions, and I couldn't tell you by color alone.
As with any other fire, you smother it, cool it or remove the fuel or any combination. For small fires that can be dealt with using a portable fire extinguisher, you would use an ABC dry powder or CO2, unless the chemical was known to be reactive to those.
Most container gas companies can either perform this task for you, or can direct you to a company that can.
Type A - water, Foam and dry chemical