Barium fluoride can be used to make motor brush, optical glass, optical fiber, laser generator, flux, coating enamel, as well as wood preservative and insecticide. Used for making flux and enamel; used as body preservative and solid lubricant. BaF2 crystal is used as ultraviolet or infrared window and laser material.

Calcium fluoride is widely used. With the progress of science and technology, its application prospect is more and more broad. It is mainly used in metallurgy, chemical industry and building materials industry, followed by light industry, optics, sculpture and national defense industry.

[purpose] it is used for manufacturing ceramics and glass; flux of metallurgical magnesium metal; coating of lens and filter in optical instrument; fluorescent material of cathode ray screen; flux, etc.

Magnesium fluoride is also used in ceramics and electronics industries. Manufacturing ceramics and glass; metallurgical magnesium flux; fluorescent materials for cathode ray screen; flux, etc. Magnesium fluoride is a colorless crystal or powder.

The vapor pressure of MgF 2 is high, and the raw material is volatile in the open system grown by czechoski method. Therefore, the growth process of MgF 2 crystal needs to be carried out under positive pressure. First, the crystal growth furnace is vacuumized to vacuum, and then filled with high purity argon to slightly positive pressure.

After the optical lens is finely ground by grinding solution, there is still a crack layer about 2 – 3 m thick on its surface. The method to eliminate the crack layer is polishing. The mechanism of polishing is the same as that of grinding, but the material used is different from that of slurry.