A halogen element, f, is major raw materials deriving fluorine compound, and because of low melting point, that is widely used in steelmaking, nonferrous metal smelting, cement, glass and ceramics.

The formula study and properties of the low smoke and low halogen(LSLH) flame retardant PVC sheathing compound were introduced.

But in 1974 scientists found that the halogen-alkyl compound is the main factor of those can lead to the Ozone cavity.