Ron Collins on thu 17 jan 02
Randy....I will be happy to respond to you off-line, if you will write to me
at my e-mail address melron@conexion.com.gt ifyou are interested in the
properties of micaceous clay, or added mica, and in different percentages.
I have a lot of tests with some interesting results. Melinda Collins,
Antigua, Guatemala
Randy Peckham on thu 17 jan 02
I have some Vermiculite from a garden shop. I have wedged in some, and
fired it. Looks good low fired, but high fired it does alot of
micro-bloating. Makes the clay very porous when you break it open. Does
anyone have a jumping off point for a percentage to add if I wanted to make
a red earthenware clay a little more resistant to thermal shock? I was
thinking of doing 10, 20, 30%, and seeing where the results were best. I
would assume that the best shape for testing this would be a disk about 10"
dia that I could put on a stove burner, and test intensity, and duration.
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Ababi on sat 19 jan 02
There are two main kinds of vermiculite. ( At least in Israel) The hard
kind, like chips, and the soft kind like bubbles, that is very easy to
crumble. I preferred the second kind as I meat to use it as a glaze
material.
Both kind in low fire give gold 'freckles' yet in ^6 and ^7 , higher I
do not know, make these holes. The first kind ugly to my test, the
second one more delicate - not my test too . This material like
perlite paper or feathers , are better to be added by volume not by
wight
Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
---------- Original Message ----------
>I have some Vermiculite from a garden shop. I have wedged in some, and
>fired it. Looks good low fired, but high fired it does alot of
>micro-bloating. Makes the clay very porous when you break it open.
>Does
>anyone have a jumping off point for a percentage to add if I wanted to
>make
>a red earthenware clay a little more resistant to thermal shock? I was
>thinking of doing 10, 20, 30%, and seeing where the results were best.
>I
>would assume that the best shape for testing this would be a disk
about
>10"
>dia that I could put on a stove burner, and test intensity, and
>duration.
>______________________________________________________
>This message (including any attachments) contains confidential
>information
>intended for a specific individual and purpose, and is protected by
>law. -
>If you are not the intended recipient, you should delete this message
>and
>are hereby notified that any disclosure, copying, or distribution of
>this
>message, or the taking of any action based on it, is strictly
>prohibited.
>_____________________________________________________
>_______________________________________________________________________
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