Nanosilica particles are silica of very small size on the nanometer scale, namely 1-100 nm. With its very small size, less than 100 nm, nanosilica is very suitable to be synthesized from fly ash waste. This research aims to examine the effect of varying heating times and the use of fly ash on the quality of the produced nanosilica. Fly ash can be used as a constituent material in cement and can…