H film — Du Pont's new polyimide film

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."
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enamel and "Pyre-M.L." varnish, both of which are being used by the electrical industry for high temperature insulation. A chemically different polyamide product is also being developed by the Textile Fibers Department in the form of HT-1 paper and yarn for high temperature use. Both "Pyre-M.L." and HT-1 were described at the Fourth Electrical Insulation Conference in February, 1962. The purpose of this paper is to describe the properties of the latest member of this high temperature polymer family, H Film.