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It is generally accepted that the mechanism of breakdown in gases at low pressures is completely described by the Townsend mechanism, and that, as the gas pressure is increased, departure from a Townsend process will be indicated by a failure of Paschen's Law. The present study was undertaken in order to investigate this transition region, and the high pressure range in general.
All insulating materials show increased electrical conductivity under ionizing radiation. The magnitude of this induced conductivity at about 104 rads/hr has been measured for a variety of representative specimens of mica, fused silica, and polystyrene, and for two special materials of particular interest: boron nitride and Corning 1723 (radiation resistant) glass.
The electrical properties of papers made from woodpulp prepared by different processes are known to differ. These differences have been attributed to differences in the quantities of residual pentosans, cooking salts, lignin and hemi-celluloses, as well as to the degree of attrition to which the fibers have been subjected. The study reported here is concerned with the variations in electrical properties...
A property of polychlorotrifluoroethylene that has been the subject of much debate is the maximum continuous operating temperature for this polymer. According to the technical brochures distributed by the manufacturers of polychlorotrifluoroethylene, the recommended maximum service temperature can vary by almost 100 degrees F. Thus, the recommended continuous service temperature for Polyfluoron, by...
The electric strength of polyethylene has been reported as being 17 kv/mil at dc and 3300 megacycles (1), at room temperature. The measurements that were made at the microwave frequencies were carried out in a “dished in” conical shaped resonant cavity. The three-quarter wavelength TEM mode of the cavity was used. The one-half wavelength section was filled with air and the remaining quarter wavelength...
This investigation was initiated to determine the possible improvement in high temperature dielectric properties of reconstituted mica which might be achieved by purification and modification techniques.
Available data on inorganic dielectrics indicate that Al2O3 and BN have better electrical properties than most other materials at high temperatures, even though measurements were made on samples of ordinary purity. It is also significant that improvements made in the quality of single crystal sapphire in recent years have resulted in increasingly better electrical properties. These facts prompted...
This summarizes a 4-year investigation of electrical surface-tracking properties of many types of synthetic polymers, including (1) thermoplastic dielectrics (for technical reference), (2) rigid casting resins and laminates for enclosed outdoor apparatus, (3) rubbery encapsulating compounds for outdoor components, with and without various fillers, mostly inorganic. Tracking under moist conditions...
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