Paper deacidifcation technique

The Library of Congress (LC) has made available the report of tests performed by the Institute of Paper Science and Technology (IPST) on books deacidified by Akzo Chemicals, FMC Corporation and Wei T'o Associates. The test results for the physical properties of the treated books are set forth in great detail, but without evaluation in four large spiral-bound volumes. I will try here to compare and evaluate the results for the benefit of readers who do not have access to those volumes. My own evaluation does not reflect the thinking of the panel that evaluated the processes for LC, and will very likely differ from anybody else's evaluation in one or more respects.

Although reference will be made to "Akzo books" and so on, the books were actually furnished by the Library of Congress. Details of the testing procedures and criteria for acceptance are in LC's request for proposals (RFP), excerpts from which were published in the October 1990 issue of this Newsletter.

The first thing anyone wants to know about a mass deacidification method they are thinking about using is "Will it deacidify our books?" For all three of the processes tested, the hot and cold extraction tests performed gave the answer "Yes." In ten paper samples taken from each of ten old and new books for each process, the pH of the books tested 7.0 or higher. __________ __________ ______ ____ ____ _______.
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