Sam Kelly on mon 6 mar 06
Hi, I have been making my own casting slip, supposedly porcelain. The
other day I wedged up some of the trimmings and had a go at throwing it on
the wheel. It worked but it didn't really want to be thrown. Is there
anything I can add to the receipt to make it more wheel friendly.
ball Clay(claypro) 25
china clay Q38 25(about $8-00 a bag cheaper than Eckalite 2)
potash feldspar 25
silica 350 25
Sam
Snail Scott on tue 7 mar 06
At 06:23 PM 3/6/2006 -0500, you wrote:
>Hi, I have been making my own casting slip, supposedly porcelain. The
>other day I wedged up some of the trimmings and had a go at throwing it on
>the wheel. It worked but it didn't really want to be thrown.
Not surprised.
Once you've deflocculated your casting slip,
it really won't be happy being anything but
casting slip. I doubt that it's worth the
effort of salvaging it to make into a throwing
body. You'd have to dilute the effect of all
that deflocculant with lots and lots of regular
clay. Trying to offset the effect chemically
seems like a bad idea.
-Snail
marci Boskie's Mama =^..^= on tue 7 mar 06
> Sam Kelly wrote:
>Subject: Can I throw casting slip
>Hi, I have been making my own casting slip, supposedly porcelain. The
>other day I wedged up some of the trimmings and had a go at throwing it on
>the wheel. It worked but it didn't really want to be thrown. Is there
>anything I can add to the receipt to make it more wheel friendly.
Sam, I dont know about throwing but I have added glycerin to porcelain
casting slip that has been stiffened to clay consistency and that makes
it more plastic... ( for making thin edges shapes) . Wedge it into the clay ..
Marci Blattenberger Boskie's Mama =^..^=
http://www.marciblattenberger.com
marci@ppio.com
Porcelain Painters International Online http://www.ppio.com
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Brant Palley NMCLAY.com on tue 7 mar 06
Vinegar or Epsom salts (0.3%) will counteract some of the deflocculation.
A 2% Macaloid or bentonite will help also.
Brant Palley
www.nmclay.com
Eleanora Eden on wed 8 mar 06
Hi Sam,
I use my lowfire slip as throwing clay but for limited uses as it doesn't have
the plasticity necessary to throw thin or tall. So I use it to throw
a lid for a
cast piece, or low stuff like plates or simple bowls.
I remember throwing high fire porcelain and it was easier too to stay low, so
I know slip clay is not the only clay that is difficult to throw.
Hope this helps,
Eleanora
>Hi, I have been making my own casting slip, supposedly porcelain. The
>other day I wedged up some of the trimmings and had a go at throwing it on
>the wheel. It worked but it didn't really want to be thrown. Is there
>anything I can add to the receipt to make it more wheel friendly.
>
>ball Clay(claypro) 25
>china clay Q38 25(about $8-00 a bag cheaper than Eckalite 2)
>potash feldspar 25
>silica 350 25
>
>Sam
>
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