Richard Aerni on wed 13 apr 11
I have all my technical data down at the studio, but as I recall, when =3D
mixing to a consistency of 70, there are only a couple of percentage =3D
points difference in the absorption of the two. I have used both in my =3D
mold making over the years and never noticed any difference. I don't =3D
slip cast, but throw wet clay into plaster forms, but I can't imagine =3D
they would behave radically different. =3D20
Just curious why you would want to use moulding instead of pottery =3D
plaster? In my case I was living in the country and it was much easier =3D
to get the moulding plaster than pottery plaster.
Best,
Richard Aerni
Rochester, NY
Stephani Stephenson on thu 14 apr 11
Richard, couldn't tell who posted the original question but
in my locale i discovered a building supplie has a stock of moulding
plaster, they keep on hand for a local medical place that uses it somehow=
=3D
in
casts.
I wondered about it ,looked it uo and it does have a consistency of 70, l=
=3D
ike
pottery plaster, but i am not sure if it the same product, or if the qual=
=3D
ity
control is the same on it.
they can special order other plaster and gypsum cement products for me t=
=3D
hough
i use gypsum cement for large press molds, just so i don't have to make t=
=3D
hem
so darn=3D20
thick
but for small - medium size molds i really like durocal. it has a
consistency of around 60 . so it is a little less porous and also has fib=
=3D
ers
in it which help it hold detail longer under repeated use.
Stephani Stephenson
C. Tullis on fri 15 apr 11
the original post was:
"We're having a discussion in the studio here in Denver. What is the dif=
=3D
ference=3D20
between #1 Pottery plaster and Moulding plaster and how would they perfor=
=3D
m=3D20
differently in slip casting moulds."
I use plaster for drape moulds (masters) from which I make pitcher (bisqu=
=3D
e)=3D20
moulds (working).
The question was posed by a studio mate that was given a bag of mouldin=
=3D
g=3D20
plaster. He slipcasts.
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