acetate envelopes
Envelopes, usually made of transparent cellulose
acetate. used for the temporary protection of
documents, letters, prints, photographs, maps,
etc. They are superior to paper envelopes in that
they substantially reduce the danger of acid
transfer. Their use, however, is declining in
favor of polyester envelopes. See also: CELLULOSE ACETATE ;
POLYESTER FIBERS .
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