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Subject: Fossils

Fossils

From: Stephen Koob <koobsp>
Date: Wednesday, October 17, 2001
Dominique Rogers <do [at] pepin__demon__co__uk> writes

>By the way does anybody else has had problems with failure of B72 in
>50/50 acetone/IMS?

You certainly run the risk of failure every time with B-72 in a
50/50 acetone/IMS (ethanol) mixture. I never recommend that you use
more than 20% ethanol.  The drying rate does not slow down much
after a 15% ethanol addition, and because ethanol is so hygroscopic,
the acrylic neither bonds well, nor sets properly. Acrylics (as
solvent adhesives) despise water. Try a 95:5 or 90:10 mixture and
make the adhesive slightly thinner (but only slightly) and you
should have excellent results.

Stephen Koob
Conservator
The Corning Museum of Glass
One Museum Way
Corning, NY 14830
e-mail:  koobsp [at] cmog__org
607-974-8228
Fax: 607-974-8470


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                  Conservation DistList Instance 15:33
                 Distributed: Friday, October 19, 2001
                       Message Id: cdl-15-33-004
                                  ***
Received on Wednesday, 17 October, 2001

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