Monoammonium phosphate, ABC Dry Chemical, ABE Powder, tri-class, or multi-purpose dry chemical is a dry chemical extinguishing agent used on class A, class B, and class C fires. It uses a specially fluidized and siliconized monoammonium phosphate powder. From Quora: While fire extinguisher powder is non-toxic, it is not entirely safe. The chemicals used are considered appropriate for home use, but you should take precautions to avoid touching or inhaling too much of the powder. The chemicals can irritate skin, so use gloves and avoid inhaling by using a dust mask, if there is a need to clean the place where fire take place. Inhalation is one of the biggest dangers with fire extinguisher powder. It is very irritating to mucous membranes and may cause difficulties with breathing if inhaled in large enough quantities.