Tara & Michael on fri 10 jan 97
I've been looking into making my own kiln posts and need some feedback from
those who have done this. Cardew, in Pioneer Pottery, has a section on
refractories which gets into the formation of mullite at high
temperatures,use of multiple grades of grog , use of talc at lower
temperatures etc. He also gives several formulas. The one which seems
most likely for me is:
Bond Clay 40 (I'm not sure what he means here.)
Refractory Grog, coarse grade 30
Dust-free fine-grade grog 30
Back in October Gary Shaffer submitted a formula which he got from a CM
article in the '70's. His posts have lasted for 12 years in cone 9
reduction. It is :
Grog 50
EPK 25
xxxSagger Clay 25 ( What is this stuff?)
If anyone has information on other types on ingedients, other formulas,
theoretical advice etc. please post it.
Thanks,
Michael Redwine
gshaffer on sat 11 jan 97
Tara & Michael wrote:
>
> ----------------------------Original message----------------------------
> I've been looking into making my own kiln posts and need some feedback from
> those who have done this. Cardew, in Pioneer Pottery, has a section on
> refractories which gets into the formation of mullite at high
> temperatures,use of multiple grades of grog , use of talc at lower
> temperatures etc. He also gives several formulas. The one which seems
> most likely for me is:
>
> Bond Clay 40 (I'm not sure what he means here.)
> Refractory Grog, coarse grade 30
> Dust-free fine-grade grog 30
>
> Back in October Gary Shaffer submitted a formula which he got from a CM
> article in the '70's. His posts have lasted for 12 years in cone 9
> reduction. It is :
>
> Grog 50
> EPK 25
> xxxSagger Clay 25 ( What is this stuff?)
>
> If anyone has information on other types on ingedients, other formulas,
> theoretical advice etc. please post it.
>
> Thanks,
>
> Michael Redwine
xxxsagger clay can be purchased at standard ceramics in pittsburgh pa.
it is a clay that forms mullite readily i beleive, and that helps in
thermal shock of repeated firings.
gary shaffer
Dannon Rhudy on sat 11 jan 97
I believe the CM article was in April, l978, by Elmer Taylor.
There is a lot of good information in there, it would be worth
your time to look it up and read it.
Dannon Rhudy
potter@koyote.com
----------------------------Original
message----------------------------
I've been looking into making my own kiln posts ... Gary Shaffer
submitted a formula which he got from a CM
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