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One of the main considerations in the manufacture of a Class “H” Insulation is the base material which is used as a carrier for the impregnating compound. To be suitable for high temperature electrical insulation, these base materials must be stable both physically and chemically at elevated temperatures up to 300°c.
Fiberglas cloth, in order to be successfully used for high temperature cable insulation, must be given a special water-repellent and heat-treatment at 650°F to 700°F before coating. When this treated cloth is properly impregnated with 996 silicone resin or 123 silastic rubber and cured at temperatures of 500 to 650°F., the resultant product gives excellent performance at elevated temperatures.
Supplementing earlier research progress reports1 concerning the physiological effects of electric shock, the authors here present the results of a sereies of experiments made to determine the heart reaction to currents of different frequencies.
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