Heavy ANFO is a blend of ANFO with up to 50% emulsion added.

Adding emulsion replaces some of the air pockets between the prills and increases the density, energy and water resistance whilst reducing sensitivity.

Heavy ANFO is sensitised by the remaining air gaps between and within the AN prills and does not generally require chemical gassing.

Heavy ANFO is generally to thick to pump and must be augered into blastholes.