As far as I can tell, MOAB is not a fuel-air explosive, just a really big classical bomb. It contains 18,700 pounds of H6: 44.0% (8200 pounds) RDX, 29.5% (5500 pounds) TNT, 21.0% (3900 pounds) powdered aluminum, 5.0% (900 pounds) paraffin wax, and 0.5% (90 pounds) calcium chloride. The RDX and TNT are traditional explosives. Powdered aluminum adds to the energy release. The paraffin is a stabilizer. The calcium chloride absorbs moisture and improves shelf life.