Thermal Studying Dry Chemicals as Hygienically Safe Extinguishing Substances

Abstract

Dry chemicals are chemicals used in the food industry as preservatives and in agriculture as fertilizers. Due to their chemical composition, they can used as extinguishing agents. Dry chemicals are extinguishing powders, which currently belong to more principal extinguishing agents that are used for the rapid and initial firefighting. For the purposes of analysis, the samples were chosen Furex and Bavex Dry chemicals, introduced into the combustion zone, operate mostly insulatively until they are heat degradable. Their effect depends on the degree of dispersion and deposition rate. For the purposes of monitoring of the thermal lability and the subsequent disintegration of extinguishing powder was chosen the analytical method of TG, DTG -thermogravimetry, where is monitored the weight loss of samples depending on the continuous heating (10°C/min in the air atmosphere). TG curves were obtained as the function of dependence of weight loss from increasing temperature. The thermal profiles presented in form of TGA curves were comparable for studied samples. All TGA curves were divided into two stages. Despite these facts, we found the certain temperature stability up to order 170°C for all samples of extinguishing powders.