George Chechopoulos on thu 24 mar 11
Dear Lili and DJ,
I have been working on Flameware Clay Bodies and Glazes for the past year
and half now and have an article on the subject which is going to be
published in the May issue of Ceramics Technical. In that article, I
discuss all of my testing procedures in detail and give guidelines for
development of Flameware clay bodies and glazes. At present, I have a very
successful Flameware clay body that I use along with a base glaze that has
been scientifically matched to that clay body through the use of Dilatometr=
y
that gives me accurate measurements for the CTE of both my clay body and
glaze. I do produce Flameware pots that I sell and "Guarantee" not to brea=
k
under normal use and my glaze does not craze or shiver. I have performed 2=
1
Thermal Shock Tests on my clay and glaze thus far and have been using my
pots in our kitchen for over a year now "on the Stove Top and in the Oven"
without any problems. Take a look at my latest video on
www.youtube.com/marrowstonepots to see what I am talking about.
If you are at all interested in Flameware clay body and glaze design, then =
I
would strongly suggest that you read my article in the upcoming May issue o=
f
Ceramics Technical before trying any formulas that you get from other
sources that have not undergone strict testing and analysis with a
Dilatometer. Also, if you are not into technical details and testing and d=
o
not have prior experience in clay body and glaze formulation and understand
your materials then I would take Lili Frakowaki's advice and not play with
Flameware because of the potential risks to yourself and others.
DJ: I would stay away from that so called Flameware clay body formula that
contains Pyrophillite that you mentioned in your message of March 22nd. It
may work for you for a while but will eventually break. Also, don't believ=
e
anyone that tells you that a Flameware clay body is compatible with salt,
soda or wood firings. Salt, soda and wood ash are not compatible glazes an=
d
there are no Stoneware glazes out there that are compatible with Flameware
clay bodies even if they say they are.
As far as the formula that you posted is concerned, it contains more lithiu=
m
than is necessary for a Flameware clay body and I would suspect that if I
did a test of that clay body on my Dilatometer that it would have a negativ=
e
expansion rate at normal cooking temperatures. That could be just as bad a=
s
having too high of a thermal expansion rate. Also, since it contains no
feldspar it may not vitrify at cone 10 which will leave you with too porous
a clay body. It also doesn't have any added plasticizers or grog and I
suspect it will not be very good for throwing on the wheel.
George J. Chechopoulos (Tsitsas)
Marrowstone Pottery
292 Merry Road, Box 193
Nordland, WA 98358
www.marrowstonepottery.com
www.youtube.com/marrowstonepots
email: marrowstonepots@waypoint.com
John Britt on thu 24 mar 11
Look forward to reading your article. Here are some other articles for th=
=3D
ose=3D20
interested:
http://ceramicartsdaily.org/ceramic-art-and-artists/functional-pottery/co=
=3D
oking-
with-clay-for-slow-food-and-a-healthy-world/
http://www.studiopotter.org/articles/art0017.htm
John Britt
www.johnbrittpottery.com
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