Perfluoroisobutyl methyl ether (HFE449), a kind of hydrofluoroether, colorless transparent liquid, non-flammable, non-explosive, non-toxic and non-corrosive, in the field of semiconductor optoelectronics, mainly used for semiconductor cooling, semiconductor cleaning or semiconductor testing; In the field of immersion cooling, it is mainly used in data centers and energy storage, and can also be used as a solvent for fluoropolymer dilution, high-end cosmetic solvents, etc., perfluoroisobutyl methyl ether is one of the hydrofluoroether series products.