Hexamine is a hexamethyltetramine, which is a hetrocyclic organic compound with the molecular formula (ch2)6n4 . hexamine is a hazardous substance. and most efficient method for preparation of hexamine is liquid phase method. in this method formaldehyde and ammonia are combining each other. by this method getting higher conversion yield upto 75-80 %. the dominant use of hexamine is in the production of powdery or liquid preparation of phenolic resins and phenolic resin moulding compounds, where it is added as a hardening component. it is also used as food additive as a preservative. also, it is used in a duff reaction. hexamine is the base component to produce rdx and consequently, as well as hexogen, octogen and hmtd.