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H Film is the designation for a new high-temperature polyimide film under development by the Film Department of the Du Pont Company. It is a product of the same research effort which produced the Fabrics and Finishes Department's "Pyre-M.L."1 enamel and "Pyre-M.L." varnish, both of which are being used by the electrical industry for high temperature insulation. A chemically different...
Measurements of dielectric constant, dielectric loss and d.c. conductivity of Teflon were made from room temperature to temperatures just below the 327°C first order transition point and from frequencies of 102 to 105 c/s on the high temperature sample holder described in the previous paper. Throughout this entire temperature and frequency range the dissipation factor never exceeds the smallest observable...