Published: Jan 1954
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Data on the dielectric properties of several plastics over temperature ranges extending from 23 C upward to about 200 C or higher, depending upon material type, are presented, principally in graphical form. Wherever available, significant information concerning the effects of relatively long exposures to high temperatures are given. The types of materials covered include the following: (1) phenolic laminates and molding materials, (2) silicone glass-cloth laminates and mineral-filled molding materials, (3) polymonochlorotrifluoroethylene molding compounds and sheets, (4) polyester cast resins and glass-cloth laminates, and (5) epoxy cast resins. Testing methods and apparatus used at elevated temperatures for d-c measurements and for a-c measurements at frequencies between 60 cps and 10 mc per sec are described. Problems relating to electrodes and special measurement techniques at high temperatures are discussed.
Development Laboratories, Bakelite Co.Division of Union Carbide and Carbon Corp., Bound Brook, N. J.
Paper ID: STP46780S