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Class A: SOLIDS such as paper, wood, plastic etc
Class B: FLAMMABLE LIQUIDS such as paraffin, petrol, oil etc
Class C: FLAMMABLE GASES such as propane, butane, methane etc
Class D: METALS such as aluminium, magnesium, titanium etc
Class E: Fires involving ELECTRICAL APPARATUS
Class F: Cooking OIL & FAT etc
Prior to 1st Jan 1997, the code of practice for fire extinguishers in the UK was BS 5423, which advised the colour coding of fire extinguishers as follows:
Water - Red
Foam - Cream
Dry Powder - Blue
Carbon Dioxide (CO2) - Black
Halon - Green (now 'illegal' except for a few exceptions such as the Police, Armed Services and Aircraft).
New extinguishers should conform to BS EN 3, which requires that the entire body of the extinguisher be coloured red. A zone of colour of up to 5% of the external area can be used to identify the contents using the old colour coding shown above.
The CO2 extinguisher cannisters contain carbon dioxide in liquid form. They extinguish fires by taking away the oxygen element of the fire triangle and also by removing the heat with a very cold discharge.
Carbon dioxide can be used on Class B & C fires. They are usually ineffective on Class A fires.
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