There was no production of fluorine until World War II, when atom bombs and nuclear energy projects required huge amounts of fluorine. Before this, fluorine salts were used in welding and for frosting glass. This element is also used to make uranium hexafluoride, used by the nuclear power industry to separate uranium isotopes. Fluorine is used in many fluorochemicals, which include solvents and high-temperature plastics, like Teflon, which is known for it's nonstick properties. Hydrofluoric acid is used for etching glass in light bulbs, and similar applications. Chloro-fluoro-carbons used to be used as aerosol-propellants, but they destroyed the Earth's ozone layer, when they were released into the atmosphere, so they are now banned.
Fluorine is an important ion for animals, because it strengthens their teeth and bones
2 parts per million of fluoride in drinking water can help to prevent dental cavities, but too much in children can cause blotches in their teeth. The average human body contains about 3 milligrams of fluoride, but too much fluoride can be toxic.
Report of First Arrest
First Arresting Officer
"The Elements: Fluorine" By Tom Jackson (2004)