Hydrogen Fluoride

Hydrogen Fluoride is a chemical compound with the formula HF. Together with hydrofluoric acid, it is the principal industrial source of fluorine and hence the precursor to many important compounds including pharmaceuticals and polymers (e.g. Teflon). HF is widely used in the petrochemical industry and a component of many superacids. HF boils just below room temperature whereas the other hydrogen halides condense at much lower temperatures. Aqueous solutions of HF, called hydrofluoric acid, are strongly corrosive.

Covenant laser weapons use the chemical reaction of hydrogen and fluoride to provide their energy. Superheated Plasma is also based off of hydrogen fluoride.