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Trace amounts of ethylene glycol present in crosslinked polyethylene during thermal aging are shown in experiments on miniature cables to exert a major accelerating effect on water-tree populations and growth. The morphology is changed from bow-tie to acicular. Few water trees grown under these conditions show foreign particles or bubbles as initiation sites. Vented trees are shown to be fan-shaped and occur in parallel arrays along the miniature cable axis under all conditions studied.>
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Karakelle et al. (1989) studied this question.
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