(Tetrafluormathane). Colorless, odorless gas. Noncombustible. Melting point -184 ℃. The boiling point of -128 ℃. Slightly soluble in water. Obtained by fluorination of carbon tetrachloride. Mainly used for making fluorine rubber, can be used as refrigerants, insulating gas. Can be used in semiconductor production of plasma etching, surface cleaning, and as a solar cell gas, laser working medium. And ultra-low temperature refrigerant gas insulated agents, microelectronics industry, dry plasma chemical etchant and rocket direction control. High concentrations have a narcotic effect on the human body. Uses: for coolant refrigerant, solvent, lubricant, insulation material, the infrared detector tube. Also for the production of cryogenic liquid manometer or as an inert gas, or for plasma etching process and the laser gas various integrated circuits.