Polyvinyl acetate emulsion

David Gray <d.gray [at] nhm__ac__uk>, posting on behalf of
of A.M. Doyle, writes

>    Can anyone recommend a conservation grade polyvinyl acetate
>    emulsion which we can use as an adhesive and as a consolidant in
>    conservation (we use ours for the conservation of sub-fossil
>    bone). Our usual product, Vinamul 6825, is no longer
>    manufactured and I have been unable to find a suitable
>    alternative ...

I wonder whether A.M. Doyle has considered the possibility of using
the acrylic copolymer Primal (Rhoplex) WS24 to replace Vinamul 6825
vinyl acetate copolymer emulsion as a consolidant for fossil bones.

Primal WS24 has a pH in the preferred range 6.8 to 7.2 and at
approximately 0.03 microns, has a much finer particle size than many
other similar acrylic emulsions.

Adding an amorphous silica (such as Gasil 23C) to the solution would
matt down the finished application.

For further information on either of these products please
contact either myself here in England (+44 1865 747755)
or Kathy at our office in Springfield, Virginia, America
(800-634-6932).

Mark Vine
Conservation Resources

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                  Conservation DistList Instance 12:46
                 Distributed: Monday, November 23, 1998
                       Message Id: cdl-12-46-009
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