Hydrophobized Silicas as Functional Fillers of Fire-Extinguishing Powders

Abstract

This paper presents a comparative evaluation of the use of hydrophobized silica materials as functional fillers in ammonium phosphate-based fire-extinguishing powders (FEPs). To this end, we have hydrophobized the surface of different silicas: commercially available fumed silica and Aerosil and monodisperse silica prepared by the Stöber method under laboratory conditions. We have optimized the content of hydrophobized silica fillers in FEPs so that the powder materials exhibit superhydrophobic properties and the lowest flow resistance.