Abstract: As a powder fire extinguishing material, good flowability plays an important role in the extinguishing effect of dry water, as well as in its future large-scale industrial production and storage. The present study investigates the impact of different lubricants and their concentrations on the flow properties of dry water by modifying it with three selected lubricants, talc powder, magnesium stearate, and glyceryl behenate. The influence of different lubricants and their contents on the flow performance of dry water fire extinguishing materials was studied through performance tests such as angle of repose, mass velocity, microstructure, and particle size distribution. The results showed that dry water modified with 1% glyceryl behenate exhibited the best fluidity, with an average angle of repose of 28.889° and an average mass velocity of 11.90 g/s, which was 24% higher than that of pure dry water.

Key words: dry-water, lubricant, flowability, microstructure, particle size distribution