Study on the fire-fighting capability and toxicity testing of fire-extinguishing powder in a combination of monoamonium photphate and inorganic salt

Abstract

Monoammonium phosphate has been known as the main material in production of fire extinguishing powder thanks to its outstanding firefighting ability and low toxicity. By mixing with some inorganic salts, a fire extinguishing powder includes monoammonium phosphate, inorganic phosphate compounds, inorganic sulfate compounds, magnesium hydroxide, inorganic carbonate compounds and other auxiliary additives has been synthesized. Properties of this fire extinguishing powder were evaluated such as thermal decomposition, fire extinguishing ability and biological toxicity in this study by using thermogravimetric analy.sis (TGA), fire testing and acute toxicity assessment (LD50)... The results showed that, on a laboratory scale, the fire was extinguished within 10 seconds after powder spray and did not reignite with a "virtually non-toxic" level of biological toxicity according to the OECD classification with the LD50 result reaching safe toxicity level