Title:
Hi,
My knowledge of these material is out of date, but plaster of paris may still
be the cheapest. It used to come in various setting speeds. The faster
it sets the more difficult it is to get the plaster into the mold and get
the bubbles out before the plaster sets. The plaster is hard way before
it gets dry. It heats up as it sets, and I think fast setting was hard enough
to remove from the mold within 15 minutes. Coloring agents of the sort used
to tint concrete can be used, but of course, add to the cost.
LouElla Saul
John.Laurie@ga.gov.au wrote:
PaleoNetters,
Our education centre manager
is looking for a material which can be used to cast replicas from latex moulds
of fossils and needs something that can effectively cure in less than about
10-15 minutes and which members of the general public can take home and stick
on their mantelpiece. With my limited knowledge I suspect that plaster-of-paris
would take too long to cure. Does anyone know of anything that would cure
in such a short time, but which is not expensive?
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Dr
John R. Laurie
Petroleum and Marine Division
GEOSCIENCE AUSTRALIA
GPO Box 378
Canberra ACT 2601
Australia
Tel: (02) 6249 9412;
Fax: (02) 6249 9980
E-mail: John.Laurie@ga.gov.au
Street Address:
Cnr
Jerrabomberra Avenue & Hindmarsh Drive
Symonston ACT 2609
ABN 80 091 799 039
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