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Re: [BKARTS] PVA response from "Elmer's"

On Feb 7, 2006, at 11:21 AM, Bruce Levy forwarded the following:

Thank you for contacting us regarding Elmer's products.

A pH value can only be measured for an aqueous solution so once the water evaporates a pH isn't measurable. If you were to reconstitute a dried Glue-All film with water after the original water had evaporated, the ensuing liquid would still be acidic, making it still unusable for archival purposes. I hope you find this information helpful and look forward to serving you as a satisfied customer in the future.
I am glad to read this statement and hope that other more knowledgeable people, specifically chemists, will attest to its content. I have always wondered how anyone, specifically manufacturers and suppliers, could say that a dry, non-absorbent material was "acid-free"? As far as I know, one cannot measure the pH of a plastic film, such as Mylar (or Melinex), or any other plastic and say that it is acid-free.
And, as Elmer says, you would have to reconstitute the adhesive with water to measure the pH, so how can, for example, a pressure sensitive tape be "acid-free" when it doesn't even contain water. As we have heard many times before, we need to be aware of the marketing strategies of manufacturers.
Bill Minter

William Minter Bookbinding & Conservation, Inc.
4364 Woodbury Pike
Woodbury, PA  16695
Fax:   814-793-4045
Email:    wminter@xxxxxxxxxxxxxx

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