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testing clay bodies

updated fri 27 aug 99

 

Tony Hansen on thu 12 feb 98

I know of a few clay manufacturers who either claim or hide the fact
that they do no testing of materials or bodies.
In view of the variation in even standard materials and that fact that
even material suppliers often disclaim the consistency of their
products on their data sheets I find this really hard to believe.

Does everyone out there expect their suppliers to test and adjust
if necessary? Does anyone have relatively good experience with using
completely untested and maintained bodies over many years?

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T o n y H a n s e n thansen@digitalfire.com
Get INSIGHT, Magic of Fire at http://digitalfire.com

Susan Schultz on wed 25 aug 99

In a message dated 8/23/99 5:32:36 PM Eastern Daylight Time, claydog@juno.com
writes:

<< Only through your testing
would you be able to determine the suitability of the clay in your
application. David, this is why we repeatedly ask our customers to test
every batch they receive. We reiterate this plea in our catalog, on our
clay boxes, even on our work orders. It is the last bastion of quality
control.
>>
I am curious how many people actually test each batch of clay for
all situations that they might use it for, every order. I recently had
crazing occur on a year's worth (3 different batches, same year) of
Laguna/Miller 10T, which I have used for many years. I never test it,
as I guess I assumed that since I've never had a problem with it, it would
perform as usual. A call to Miller revealed that I was the only person
to have this problem. I called to a nearby distributor to be told that in
fact
he knew of problems with this clay in the last year. I have a large mural
that is now a struggle to glaze. My lesson-test before putting hours and
hours into a piece. And I plan to switch clay bodies and companies.

Susan Schultz

Susan Fox Hirschmann on thu 26 aug 99

In a message dated 8/25/99 3:49:28 PM EST, Scsclay@aol.com writes:

<< My lesson-test before putting hours and
hours into a piece. And I plan to switch clay bodies and companies.
>>
Guess the days are gone when our clay suppliers (back in when Eagle/cutter
ceramics was in business) used to test fire each batch of clay that they
mixed BEFORE they even shipped out their clay orders. You would think we
could at least depend on high quality clay and chemicals. But one never
knows these days.
Ah for the good old days!

susan fox hirschmann (ole timer in clay)
((I'm back after a month off of clayart, if any of you tried to reach me)