Preservation and expertise at BnF

The Preservation Division offers services for external institutions, libraries and archives, as part of its various production activities.

Preservation and expertise: desacidification

Mass Desacidification

In cooperation with the Centre de recherche sur la conservation des collections – CRCC (formerly the Centre national de la recherche sur la conservation des documents graphiques – CRCDG), BnF has adapted an existing process which makes it possible to neutralize acid in the paper; a desacidification unit was then settled at the Sablé Center. Batches of 100 to 200 volumes are treated in a vacuum chamber where they are first dehydrated (paper moisture is brought back to 0,5%) before being immersed in an aqueous solution composed of freon (90%) and magnesium ethoxide under pressure. 25,000 to 30,000 volumes a year can be treated in the desacidification unit.

Cost :
21 euros (excl. tax) per kilogrammes of material (insurance and transportation not included)
The minimum order is fifty kilogrammes of material.


Centre technique de conservation Joël-le-Theule
Le Château
72300 Sablé-sur-Sarthe
Téléphone : 02 43 95 19 92
Courriel :

Annie Bonnaud - Directrice
Alain Lefebvre - Expert chimiste

Thursday, May 12, 2011

For more info

sur la désacidification de masse [fichier .pdf – 315 Ko – 14/10/09 – 24 p.] in Actualités de la conservation, n° 22-23, janvier-juin 2005