Tony Hansen on sat 1 mar 97
I did some fired strength testing bars today that were incredible.
I had about 6 different sets of cone 06 glazed bars, all the glazes were
beautiful, no crazing or shivering. The bar groups broke very consistently
indicating reliable results.
The glazeless bars broke at 1200 lbs.
The strongest glazed bars were 1600 lbs.
The weakest were 250!
Again it appears that the single most profound effect on ware strength
is glaze fit. And you simply cannot determine if your glazed ware is
strong or weak by simply doing a visual inspection. In a worst case
scenario here a potter could increase his ware strength 6-fold by a
simple glaze recipe adjustment!
--
=================================================================
Tony Hansen, IMC - Get INSIGHT 5 beta or The Magic of Fire II at
http://digitalfire.com or http://www.ceramicsoftware.com
Suzanne Storer on mon 3 mar 97
How does one carry out glaze bar tests? Can you direct me to a source for
such information if it will take you too long to explain it in detail?
Thanks, Suzanne StorerAt 12:15 PM 3/1/97 EST, you wrote:
>----------------------------Original message----------------------------
>I did some fired strength testing bars today that were incredible.
>I had about 6 different sets of cone 06 glazed bars, all the glazes were
>beautiful, no crazing or shivering. The bar groups broke very consistently
>indicating reliable results.
>
>The glazeless bars broke at 1200 lbs.
>The strongest glazed bars were 1600 lbs.
>The weakest were 250!
>
>Again it appears that the single most profound effect on ware strength
>is glaze fit. And you simply cannot determine if your glazed ware is
>strong or weak by simply doing a visual inspection. In a worst case
>scenario here a potter could increase his ware strength 6-fold by a
>simple glaze recipe adjustment!
>
>--
>=================================================================
>Tony Hansen, IMC - Get INSIGHT 5 beta or The Magic of Fire II at
>http://digitalfire.com or http://www.ceramicsoftware.com
>
Bob Kavanagh on tue 4 mar 97
Suzanne
Tony Hansen sent in the results. He's a whiz at such things. Try
contacting him in Medicine Hat, Alberta, Canada, thansen@mlc.awinc.com. He
wrote Magic of Fire (IMC: Medicine Hat, Alberta, 1995) and in it shows
simple test for strength testing in this book. He is the author of
Insight, Foresight and other things.
bob kavanagh (60 km west of Montreal)
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