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ASTM Selected Technical Papers
Symposium on Temperature Stability of Electrical Insulating Materials
K. N. Mathes
K. N. Mathes
General Electric Co.
Schenectady, N. Y., Chairman of Symposium Committee
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ASTM International
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The development of special equipment and procedures for the study of electrical properties of thermosetting plastic materials at elevated temperatures are described in detail. Descriptions of equipment for elevated temperature measurements of dielectric strength, dielectric constant, electrical loss, and electrical resistance are presented. Data on the effects of long- and short-time exposures on several laminated materials are given. Emphasis is placed on very short-time temperature exposure in view of the extreme changes in properties exhibited by many materials. Changes in properties, both transient and permanent, are noted. Crazing of silicone laminate at elevated temperatures was detected and is described.

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