It's my understanding that plywood is far from archival. It continues to
emit gasses from the materials used to glue the layers of wood together.
I believe this is also the case for hardboard/pressed board. One product
that is useful in blocking these gasses (and is popular with
conservators) is MicroChamber boards and papers. They are available from:
Conservation Resources
8000-H Forbes Place
Springfield, VA 22151
(800) 634-6932
Fax (703) 321-0629
Sincerely,
David Kern
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