Terracotta roundels

Kathryn Hallett <kathryn.hallett [at] hrp__org__uk> writes

>... We are looking for a material we could use for a
>holding repair, to seal and strengthen the cracked areas until more
>permanent repairs can be made.

I recently read a research aiming to strengthen low-fired earthen
structure, situated outdoors. The materials used were 5 per cent
Paraloid B-72 solution in toluene and 12 per cent Wacker Silicone
290L solution in mineral turpentine (both as a separate solutions
and as a mixture). The mixture appears to have the best
strengthening properties of all solutions applied. According to the
Wacker information brochure, 290L is also to be used on brick and
stone walls. Besides, Wacker Silicones have hydrophobizing effect.

Krassimira Frangova


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                  Conservation DistList Instance 18:23
                 Distributed: Monday, November 22, 2004
                       Message Id: cdl-18-23-017
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