Adhesive for glass

Robert K. MacDowell <macdowell_r [at] mediasoft__net> writes

>Occasionally we are faced with important items of glassware having
>cracks that do not result in actual breakage of the object. We would
>like a good approach to wicking an adhesive into the cracks and
>having it cure slowly (to allow the wicking process time to
>complete).  I am not enthusiastic about the use of epoxy because of
>the risk of yellowing.

Being faced with similar questions in the field of glass
conservation we had tested a series of different epoxy and uv-curing
glass adhesives in 1992/1993.

The different adhesives were evaluated regarding different aspects,
such as viscosity,  refractive index and especially colour changes
due to artificial light and heat aging. In general reversibility is
a problem with both epoxy and uv-curing adhesives. The colour
changes depend a lot on the adhesive itself and also on the
thickness of the layer. Details of the evaluation can be found
under:

    E. Sander-Conwell/K. Schmidt-Ott
    Vergleichende Untersuchungen zu UV-hartbaren Glasklebstoffen
    Arbeitsblatter fur Restauratoren
    Heft 1- 1993
    Gruppe 5 , Glas, Seite 67-71

Katharina Schmidt-Ott
Swiss National Museum
Department of Archaeology
Hardturmstr. 185
8005 Zurich, Switzerland

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                  Conservation DistList Instance 12:17
                Distributed: Wednesday, August 12, 1998
                       Message Id: cdl-12-17-006
                                  ***