John Rodgers on sat 18 mar 06
Has anyone ever worked with Grolleg as a slipcasting clay?
I have Standards #365 (I think the number is correct) Cone 6 dry-bagged
clay and would like to mix and use it as a casting slip. I called
Standard for slip making instructions and density reccomendations but
they had nothing to offer.
Are there any serious slipcasters amongst us? And have any of you
worked with this clay as a casting slip? Any recommendations?
I have worked with many slips, and crucial factor #1 is getting the
denstity right for the clay. Once done, then the viscosity can be
adjusted with a de-flocculant. I can play with it forever, but I'm
hoping someone can give me some pointers that may save me considerable time.
Thanks for any help with this.
Regards,
John Rodgers
Chelsea, AL
Michael Wendt on sat 18 mar 06
John,
We mix the clay as follows:
15 lbs H2O
35 lbs dry porcelain
1/2 ounce Darvan (initially) in the water
Add the dry body while the prop stirs
if you can't keep it turning, add a drop
of Darvan at a time until it mixes again
Continue until all the dry is in. Then fill
a 1000 cc measuring cup with the result
and see if it weighs between 1680 and
1720 grams. Our clay casts better at
the lower S.G. but you can try the upper
limit first and see if you can get a proper
pour out without runs.
We don't add any more Darvan until the clay
has sat for a day or two and been remixed.
Regards,
Michael Wendt
Wendt Pottery
2729 Clearwater Ave
Lewiston, Idaho 83501
USA
wendtpot@lewiston.com
www.wendtpottery.com
Has anyone ever worked with Grolleg as a slipcasting
clay?
I have Standards #365 (I think the number is correct)
Cone 6 dry-bagged
clay and would like to mix and use it as a casting
slip. I called
Standard for slip making instructions and density
reccomendations but
they had nothing to offer.
Are there any serious slipcasters amongst us? And have
any of you
worked with this clay as a casting slip? Any
recommendations?
I have worked with many slips, and crucial factor #1 is
getting the
denstity right for the clay. Once done, then the
viscosity can be
adjusted with a de-flocculant. I can play with it
forever, but I'm
hoping someone can give me some pointers that may save
me considerable time.
Thanks for any help with this.
Regards,
John Rodgers
Chelsea, AL
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