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Chemguard ABC dry chemical is a multipurpose, monoammonium phosphate based, dry chemical powder that is treated with flow promoting and moisture repellent additives during manufacturing. ABC dry chemical is suitable for use as a recharge agent in most manufacturers' fire extinguishers that utilize monoammonium phosphate based dry chemical powder. It is very effective on fires involving ordinary combustible materials such as wood, paper, cotton, rubber, many types of plastics as well as fires involving flammable liquids and energized electrical equipment. Because of its versatility, ABC is most suitable for use on combination fires involving Class A, B or C type fires together. Chemguard ABC is typically yellow in color, which differentiates it from the other dry chemical powders.
When Chemguard ABC dry chemical powder is introduced directly into the fire area of a Class B type fire, it causes the fire to go out by interfering with the chemical chain reaction of combustion. When the ABC powder is applied to a Class A type fire, the particles fuse and swell up to form a barrier (coating) that eliminates oxygen and thereby completes the extinguishing process and prevents reignition.
All Chemguard dry chemical powders are considered foam compatible when used in conjunction with foam solutions generated by Chemguard manufactured foam concentrates such as AFFF, AR-AFFF, High Expansion, Training foams and Class “A” foams.
Per NFPA Standard 10 Portable Fire Extinguishers, Chemguard does not recommend ABC dry chemical powder is used on fires involving cooking grease or vegetable oils. Suitable agents for these type fires are either sodium bicarbonate or potassium bicarbonate based powders.
Chemguard dry chemical powders are formulated so that they are not affected by long-term storage. As a general guide all powders are stable at low temperatures down to -60ºF (-54ºC), with an upper storage limit of 120ºF (49ºC).
Never mix monoammonium phosphate based fire-extinguishing agents with bicarbonate-based agents in any fire extinguisher due to a chemical reaction that may occur
Custom formulations including variations in the monammonium phosphate content of the ABC dry chemical are available upon request.