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The volume conductivity of polyethylene terephthalate films has been measured as a function of temperature in the range 65° to 150°C.; as a function of voltage in the range 1 to 1000 volts/mil; and as a function of film variables such as orientation and/or crystallization. Supplementary dielectric constant and loss measurements were also made. Previous work by Amborski(1) has defined the high temperature...