Ανιονικός πολυσακχαρίτης με μικρό αριθμό ακυλίων που παράγεται από το βακτήριο Sphingomonas elodea , κατάλληλος για την παρασκευή ημι-άκαμπτων gel .

Χρησιμοποιείται σε συγκέντρωση 2% έως 5% και παράγει θερμο-αναστρέψιμα gel τα οποία μπορούν να χρησιμοποιηθούν  σε αλλεπάλληλους κύκλους.

Χρησιμοποιείται στη συντήρηση χάρτινου υλικού προκειμένου να αφαιρέσει κίτρινους λεκέδες, παλαιές αυτοκόλλητες ταινίες κ.α.

Μπορεί ακόμη να χρησιμοποιηθεί στην ενεργοποίηση συγκολλητικών, στην επιπεδοποίηση τσακισμάτων καθώς και στο ελεγχόμενο πλύσιμο χάρτινου υλικού.

Gellan Gum Kelcogel CG-LA" Gel  for use on water-sensitive paper objects:

Removal of water-soluble discolorations through contact with the paper surface, suitable for swelling and peeling off overlays.

Agar and Gellan Gum are gels that are suitable for cleaning art objects made from a wide variety of materials. This cleaning method was developed and tested at the Istituto Centrale per il restauro e la conservazionedelpatrimonio archivistico e librario (ICPAL).

Gellan Gum is preferred over agar because it does not dampen the paper and because of its greater transparency, the work process can be followed more easily. The higher the percentage of gel, the less water is released into the paper.

Recipe and preparation (Gellan Gum)

The gel is made with an alkaline salt solution, which is important for flexibility as well as for the pH value.

0.4 gcalcium acetate in1 ldeionized water, 20–40 g Gellan Gum covered in the microwave at approx. 500 watts warmed up for about 2 minutes. The mixture must reach 85 ° C so that a clear solution is created.

Carefully empty the hot solution into a heat-resistant container (for1 lsolution, the container should measure34 cmx45 cmx1 cm.) When the gel has reached room temperature, it is ready for use and can be placed directly on the back of the object be placed. In order to achieve even moistening, the object is placed in a sandwich of polyester foils and weighted down with a glass plate so that what is happening can be better observed.

Overweighting should be avoided as there is a risk of too much liquid being released onto the paper. The treatment should not last longer than 30 minutes.

Advantages of this cleaning method The gel leaves no residue on the paper. If traces of it stick to the surface, you can easily remove them with a spatula. Due to the consistency and thickness of the gel, it can adapt well to unevenness surfaces.

Degradation products remain in the gel, which is colored yellow-brown by the dirt particles. The gel can be used again on the other side. However, it should not be cleaned and reused.

Clean and unused residues can be reheated and poured out again. The gel can be max. Store in the refrigerator for 1–2 days, covered with foil, as otherwise there is a risk of mold growth.

Other possible uses

The gel is very suitable for softening adhesives made from plants or animals and for removing adhesive backing. Since the gel can also be prepared with water or buffered solutions, options are now being tested to use the gel for deacidification or in combination with enzyme solutions.

Προδιαγραφές

Εμφάνιση:

Υπόλευκη σκόνη

Σύσταση:

Ανιονικός πολυσακχαρίτης με μικρό αριθμό ακυλίων

pH:

(1% σε H₂O)

4.5 – 6.5