Workshop on transparent moulds

Workshop

"Transparent mould used in the process of replacing missing pieces
    on hollow glass objects"
Institut National du Patrimoine
Paris, France
2015, October 7-9, 2015

The workshop will be directed by Gorazd Lemajie, from National
Museum of Slovenia.

In the process of restoring missing pieces of hollow glass objects
by casting resin into a two-sided mould, several procedures are
involved.  At every stage there are problems that can occur and
these need to be eliminated as far as possible, without subjecting
the glass object to potential damage.  The problems most likely to
occur are connected with:

    Securing moulds to the glass surface, so as to prevent flowing
    of resin out of the mould, flowing of resin over the original,
    forming a step where the original and the cast meet

    Maintaining a regular space between inner and outer moulds, to
    avoid cast to be to thin or to thick

    Injecting or casting resin into the mould

    Dealing with air bubbles and shrinking of resin

Reflecting on these problems, it is obvious that it would be easier
to eliminate them if one side of the mould could be made of a
transparent material that would allow the conservator to monitor the
progress of the cast resin inside.  It is normally the outer mould
that is made of a transparent material; the inner mould can be made
of silicone rubber that is easier to handle because of its
flexibility.  Correction of faults in the molten resin reduces the
need for correction of faults in the hardened cast.

Information and contact:

    <URL:http://www.inp.fr/Formation-initiale-et-permanente/Formation-permanente/Catalogue-de-formation/Moules-transparents-pour-le-comblement-du-verre-ou-autres-materiaux>

Dorothee Clermontel
Conservators department
Institut National du Patrimoine


                                  ***
                  Conservation DistList Instance 29:10
                  Distributed: Thursday, July 30, 2015
                       Message Id: cdl-29-10-008
                                  ***