The porcelain problem is caused by the expansion and contraction of the steel
inside the porcelain. When it contracts their is a void between the steel and
porcelain. When it expands the porcelain is forced by the steel to expand and
can't.
This type of situation has exsisted for years when using aluminum/porcelain
insulators. The problem is enhanced by the aluminum because aluminum is more
suseptable to expansion and contraction.
Also, the polymer insulators are actually fiberglass inside. The polymer is the
outer shell and is formed to increase the surface area and distance from end to
end.
Mike Martin
RFI Services
6469 Old Solomon's Island Road
Tracy's Landing,MD 20779
240-508-3760
mike@rfiservices.com
Visit us at: rfiservices.com
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