Craig Edwards on mon 23 feb 04
Hello Jonathan: I would just go pick up some more EPK. You can sub in
calcined at a lower percent, however you might encounter application
problems. EPK helps suspend the glaze so it won't settle quickly and
also gives gives a more durable application. I have used calcined at
times to reduce application shrinkage when the glaze wasn't sticking
well and would peel back in the firing. So it can also be a benefit.
When I do this I'll throw in a teaspoon of Epsom to help with the
suspension, also a little CMC gum to help with the poise of the glaze.
Cheers
~Craig Edwards
New London MN
Imbolchottie@aol.com wrote:
>When I was mixing up a batch of glaze this week I found that our studio had
>run out of EPK which is needed for the 20 x 5 glaze. I did, however, find that
>I had enough Calcined Clay on hand.
>
>Question is -- Is this a good substitute, or a bad substitute?
>
>Jonathan
>in the early hours of a rainy LA morning
>
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Ababi Sharon on mon 23 feb 04
The kaolin in this glaze is for the suspension. When you will use
calcined kaolin you will have to add CMC and to reduce the amount of the
L.O.I. which is almost 14%
Which means 20X86.1 %=17 +-
I would use a different kaolin or even ball clay.
Please note I have changed my signature. Do the glaze gurus agree to it?
Ababi Sharon
Glaze wizard
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://ababi.active.co.il
http://www.matrix2000.co.nz/Matrix%20Demo/Ababi.htm
A fast link Ceramics forum in Hebrew:
http://www.botzpottery.co.il/kishurim.html
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of
Imbolchottie@AOL.COM
Sent: Monday, February 23, 2004 3:05 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: ? on 20 x 5 glaze
When I was mixing up a batch of glaze this week I found that our studio
had
run out of EPK which is needed for the 20 x 5 glaze. I did, however,
find that
I had enough Calcined Clay on hand.
Question is -- Is this a good substitute, or a bad substitute?
Jonathan
in the early hours of a rainy LA morning
________________________________________________________________________
______
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Ron Roy on mon 23 feb 04
Hi Jonathan,
Looks like 17.5 calcined kaolin will do it - but it will be difficult to
keep the glaze stirred.
Dropping the kaolin to 17 and adding 2 bentonite would be a little better.
Another perfect problem for solving with calculation software.
RR
>When I was mixing up a batch of glaze this week I found that our studio had
>run out of EPK which is needed for the 20 x 5 glaze. I did, however, find that
>I had enough Calcined Clay on hand.
>
>Question is -- Is this a good substitute, or a bad substitute?
>
>Jonathan
>in the early hours of a rainy LA morning
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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