Qualitative production development of ceramic high-tension insulators concerns mainly the improvement of their mechanical strength. A higher mechanical strength of the same type of insulator can be obtained by improving its construction or the quality of its material.nIn recent years many production plants have improved the mechanical strength of materials. This fact is illustrated by the data in Table 1 which lists the mechanical strength and specific gravity values required for material of Group No. 110 according to PN-56/E-O63OI and DIN ^0685 as well as the mean values obtained by Rosenthal-Isolation Works for two standard materials of Group
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