Monoammonium phosphate, ABC Dry Chemical, ABC 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.[1] ABC dry chemical is usually a mix of monoammonium phosphate and ammonium sulfate, the former being the active component. The mix between the two agents is usually 40 60%, 60 40%, or 90 0% depending on local standards worldwide. The USGS uses a similar mixture, called Phos Chek G75F
We are professional manufacturer and exporter of all kinds of fire extinguisher and fire extinguishing agents, such ABC dry chemical powder (ammonium phosphate powder) and BC dry chemical powder(sodium bicarbonate powder), BK dry powder (potassium bicarbonate powder, purple K dry powder), metal dry powder (Class D dry powder), gas R227 (HFC 227ea, FM 200), HFC 236fa (R236FA) , FK5112(Novec 1230) clean fire extinguishing agent, and so on.
Sodium chloride (Super-D, Met-L-X, M28, Pyrene Pyromet[a]) contains sodium chloride salt, which melts to form an oxygen-excluding crust over the metal. A thermoplastic additive such as nylon is added to allow the salt to more readily form a cohesive crust over the burning metal. Useful on most alkali metals including sodium and potassium, and other metals including magnesium, titanium, aluminum, and zirconium. Do not use with lithium fires as lithium can react with NaCl to form LiCl and Na which will continue burning.
Potassium bicarbonate (principal constituent of Purple-K), used on class B and C fires. About two times as effective on class B fires as sodium bicarbonate, it is the preferred dry chemical agent of the oil and gas industry. The only dry chemical agent certified for use in ARFF by the NFPA. Colored violet to distinguish it.
Sodium bicarbonate, regular or ordinary used on class B and C fires, was the first of the dry chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire. That is, the gas drives oxygen away from the fire, thus stopping the chemical reaction. This agent is not generally effective on class A fires because the agent is expended and the cloud of gas dissipates quickly, and if the fuel is still sufficiently hot, the fire starts up again. While liquid and gas fires do not usually store much heat in their fuel source, solid fires do. Sodium bicarbonate was very common in commercial kitchens before the advent of wet chemical agents, but now is falling out of favor as it is much less effective than wet chemical agents for class K fires, less effective than Purple-K for class B fires, and is ineffective on class A fires. White or blue in color.
