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Polyester
film is inherently more chemically stable than either nitrate or acetate
and is the
best choice for archival use. To
date there have been no cases of chemical deterioration of polyester base
in archival collections.
While nitrate
and acetate can be torn, polyester cannot (except with great effort).
It
is difficult to splice on traditional splicing equipment so the acceptance
of polyester base in cinema films has been slow.
Today, most
sheet films (except color) and most microfilm are on polyester base.
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