What is the difference between ABC powder, BC powder and dry powder extinguishers?
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When talk about powder extinguishers, Frequently asked questions are; 'What's the difference between ABC Powder Fire Extinguishers and Dry Powder Fire Extinguishers'?
The answer is that the two terms are largely interchangeable, as most dry powder extinguishers today are ABC powder extinguishers. To be more precise, the term 'Dry powder' is the general term for a type of fire extinguisher while ABC powder is the powder used in most dry powder extinguishers. However, there are also other types of 'dry powder'.
Here is an overview of the different powders available: ABC Powder - Made up of ammonium or mono-ammonium phosphate mixed with other powders to improve flow or add bulk. ABC powder is often referred to as all-purpose or all-purpose fire extinguishing powder and is capable of extinguishing class A, B and C fires. BC Powder - Sometimes called the standard powder, as it was popular before ABC powder became the standard, is a sodium bicarbonate based powder. Monnex Powder - A compound of potassium bichromate, highly effective on gasoline and oil fires. Monnex powder is expensive compared to BC and ABC powder. Class 'D' Powders - These specialized powders are used for fires involving combustible metals, such as magnesium and lithium chips or swarf and are typically used with a low-speed discharge wand that will do the job. Drop the powder directly on the fire. The self-melting powder forms a glassy layer, covering the flame and preventing oxygen from reaching the fuel while absorbing heat. These extinguishers are NOT suitable for lithium ion fires such as laptop batteries! The most common types of dry powder extinguishers in use are the ABC powder type, as ABC powder is the cheapest to manufacture and offers exceptional versatility and extinguishing power.
General parameters and instructions for use of fire extinguishers....See here
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