Electrical Properties of Pentachlordiphenyl Impregnated Glass Fiber Paper I

In an effort to determine the effectiveness of glass fiber paper when used as a ther-mally stable dielectric in capacitors, a study was made of the electrical properties of the glass, the impregnant, he glass fiber paper, and impregnated paper. The dielectric constant of Pyrex-E glass was found to be 6.1 to 6 5 over the tempera-ture range-60 ~ to 120 ~ at 60, 1000, and 10,000 cycles. The loss factor under similar conditions was 0.01 to 0.3. Glass fiber paper has a dielectric constant of 1.07 and a loss factor of 0.0001 to 0 0005. These values are in agreement with Endicott 's equations. When impregnated with pentachlordiphenyl (dielectric constant 3.0 to 5.5; loss factor 0 05 to 1.0), the electrical osses of the glass fiber paper are lower than those predicted by the equations. I t would seem that these equations may be employed to predict the upper l imit to be expected in loss factor from a combination of impregnants