SUMMARY Fly ash Coal is one of the potential wastes as a raw material in the manufacture of synthetic zeolite. Use Fly ash coal in zeolite synthesis due to the high content of SiO2 and Al2O3 in fly ash coal. The aim of this study was to synthesize zeolite A from coal fly ash using the alkaline hydrothermal fusion method with variations in synthesis time for 5 hours, 12 hours and 24 hours and t…