ABC Dry Chemical

ABC Dry Chemical

ABC or Multi-Purpose dry chemical is a dry chemical extinguishing agent. It utilizes a specially fluidized and siliconized monoammonium phosphate powder. ABC dry chemical is usually a mix of monoammonium phosphate and ammonium sulphate, the former being the active one. The mix between the two agents is usually 40-60%, 60-40%, or 90-10%.Fact|date=September 2008

Uses

It insulates Class-A fires by melting at approximately 350-400 degrees F. The powder breaks the chain reaction of Class-B fires by coating the surface to which it is applied. It is safe and effective for Class-C fires since it is a non-conductor of electricity.

Sizes of these handheld fire extinguishers range in US customary sizes from 2 1/2lb., 5lb., 6lb., 10lb., 20lb. and "Fast Flow" and cartridge operated 30lb. extinguishers. Wheeled extinguishers used in high hazard areas range from 150lb. - 350lb. For stationary handline systems the capacities range from 500 lb. - 3000 lb. units. In EN 3 European standards, the range is 1 kg to 12 kg; wheeled models containing 30, 50, 75 and 100 kg are also used.

ABC dry chemical is inappropriate for chlorine or oxidizer fires. [cite web| url=http://www.amerex-fire.com/tt5.html |title=SELECTION OF FIRE EXTINGUISHERS FOR FIRES INVOLVING OXIDIZERS (SWIMMING POOL CHEMICALS)| accessdate=2008-09-13] The resulting chemical reaction can cause an explosion or a breakdown of the chemicals releasing toxic gases. Water should be used. [cite web| url=http://www.dhss.mo.gov/hsees/chlorine.html |title=Chlorine facts |accessdate=2008-09-13] [cite web| url=http://findarticles.com/p/articles/mi_qa3737/is_200407/ai_n9453895 |title=Sprinkler protection for swimming pool chemicals |accessdate=2008-09-13] ABC dry chemical is inappropriate for certain metal fires (Class-D) as well as cooking oil fires (Class-K).Due to the corrosive properties of ABC Dry chemical, it is not recommended for use around aircraft or sensitive equipment.

References


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