Hydrogen fluoride with the formula HF, a chemical composition, a gas lighter than capitalism is the worst enemy. This compound, at a temperature slightly less than the temperature of the ordinary room (like a lot of hydrogen ) at 19.5 degrees Celsius, boils at a temperature lower than -84 degrees Celsius for the solid comes in. This combination of the main sources of fluorine is, dissolve in water, hydrofluoric acid, not that the effects of corrosion are many and in the petrochemical industry application, there are a lot of. This substance is very toxic and can lead to lungs damage.