Temperature and humidity considerations for the preservation of organic collections - the isoperm revisited
Auteur ou éditeur
Strang, Thomas J.K.
Grattan, David W.
Date de publication
2009
Collation
122-128
Titre de la source
e-Preservation science
Numéro de la source
vol. 6
Résumé
Since Sebera published his paper on Isoperms in 1994, much has changed. A significant amount of data has accumulated on the mechanism of paper degradation, more activation energies have been determined and there has been a convergence of values. Assumptions about the relationship between the relative humidity and the moisture content or the rate of degradation of paper need no longer be made as near complete theoretical descriptions are available. The method of modelling has therefore been revised and now incorporates the Arrhenius equation and the moisture sorption isotherm, which is best modelled by the Guggenheim-Anderson-deBoer (GAB) equation. This new method will allow direct experimental verification of the isoperm for cellulosic materials in museum collections. As the cost of energy usage for preservation has now become an important question, it is particularly critical to have access to more accurate isoperms.
