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The experiments described here give further confirmation of the fact that microbiological failure of rubber insulation is caused by the penetration of certain soil fungi.
This paper deals with one phase of a general study of the microbiological deterioration of rubber and similar insulations. In the earlier papers 2 types of microbial attack were shown: 1) direct eating of natural rubber insulation, 2) production of micropores thru walls of both natural and synthetic rubber insulation, or neoprene jackets.
This study is aimed at the development of rubber insulations completely resistant to attack by soil microorganisms. The failures caused by soil microbes are minute Regions of low insulation resistance and dielectric strength surrounded by sound insulation.
The development of rubber insulations capable of maintaining good electrical characteristics indefinitely in wet locations has made possible the manufacture of non-leaded underground cable.
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