Some fluorinated liquid dielectrics

MANY FLUORINATED LIQUIDS have been made which are of potential interest to electrical engineers. They make available, for the first time, a group of properties not found in any presently used liquid dielectric. They are stable to high temperatures, water and chemical attack, are nonflammable and nonexplosive. Low power factor and low conductivity are characteristic. Advantage also can be taken of the volatile character of these materials. This results from the relatively low range of boiling points (56 to 178 degrees centigrade) found in the compounds which have been studied for electrical uses and the more volatile nature of fluorocarbons in general. This can be put to use in obtaining high vapor densities at relatively low temperatures thereby effecting such improvements as increasing the dielectric strength in the vapor phase. A high natural convection modulus also results which can give improved heat transfer from autoconvection. Good arc-extinguishing properties and low carbon formation from arcing also are found.