The particular case of the National School of Buenos Aires sets out a peculiar dynamic in regards to its cultural Heritage, since it is not an institution conceived as a museum. The fact that the collections within the school are still used for teaching, characterizes and determines the type of treatment or care that its given to them. The objects that have been acquired and used through time in the Institution, define the history of sciences and public teaching in our country. These objects, contained and divided in their own departments have to be treated as part of a collection within itself, and preserved as such. The Program for Preservation and Revaluation of Cultural Heritage has, in this particular case, the aim of adapt and set out the conservation actions with a new approach in mind in order to achieve a balance between the historical-museum aspect of the collections and its use as a current didactic material.