Phil Smith on tue 23 sep 03
Hi,
Since Sulfur is a non-desirable element in glazes why would folks use
magnesium sulfate(Epsom Salts) in their glazes to thicken/suspend them?
If the glaze also contained Zinc would this lead to pinholing?
Phil...
Ababi on wed 24 sep 03
Hello Phil
I do not know about zinc and sulfate, but we must be very careful with
rules. This is good and this is bad just because of the name.
If your glaze does not have enough clay, you will not have suspension
and shortly after you make the glaze, it will have in the hard bottom of
the jar " Hard Rock".
The best way is to reformulate the glaze.
An add of the 2 bentonite helps when there is some clay but not always.
The best way is to reformulate the glaze. If you cannot or do not know
how you add to the water a very small amount of magnesium sulfate- as I
have written before- I cannot tell you exactly how much.
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910
http://www.matrix2000.co.nz/Matrix%20Demo/Ababi.htm
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Phil Smith
Sent: Tuesday, September 23, 2003 11:44 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Why add Sulfur to Glaze?
Hi,
Since Sulfur is a non-desirable element in glazes why would folks use
magnesium sulfate(Epsom Salts) in their glazes to thicken/suspend them?
If the glaze also contained Zinc would this lead to pinholing?
Phil...
________________________________________________________________________
______
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 thu 25 sep 03
--============_-1147653678==_============
Content-Type: text/plain; charset="us-ascii"
There is usually sulfur associated with clays an it is part of pyrites as
well. It acts like carbon and other organics - if given enough time and
oxygen it will burn off.
Beside - the amounts of magnesium sulphate used to flocculate clay and
glazes is so small it has never been a problem that I know of.
I speak from experience in this - many of the clay bodies I monitor have
Epsom salts added to prevent deflocculation.
RR
>Hi,
>Since Sulfur is a non-desirable element in glazes why would folks use
>magnesium sulfate(Epsom Salts) in their glazes to thicken/suspend them?
>If the glaze also contained Zinc would this lead to pinholing?
>
>Phil...
--============_-1147653678==_============
Content-Type: text/plain; charset="us-ascii"
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
--============_-1147653678==_============--
Earl Krueger on thu 25 sep 03
On Sep 24, 2003, Ron Roy wrote:
> many of the clay bodies I monitor have
> Epsom salts added to prevent deflocculation.
Ron, Ah Hah !! Another mystery solved(?).
Since I'm still new at this game I recycle
a lot of my clay by letting it dry, making
a slip of it and then drying out on
Mexican paver tiles. When the tiles
dry they develop a lot of white fuzzy
crystals around the edges.
Could they be something other than
magnesium sulphate?
Thanks...
Earl...
Bothell, WA
Charles Moore on thu 25 sep 03
Ron,
There is an attachment along with your email. I wonder how that happened.
Charles
----- Original Message -----
From: "Ron Roy"
To:
Sent: Wednesday, September 24, 2003 10:46 PM
Subject: Re: Why add Sulfur to Glaze?
> There is usually sulfur associated with clays an it is part of pyrites as
> well. It acts like carbon and other organics - if given enough time and
> oxygen it will burn off.
>
> Beside - the amounts of magnesium sulphate used to flocculate clay and
> glazes is so small it has never been a problem that I know of.
>
> I speak from experience in this - many of the clay bodies I monitor have
> Epsom salts added to prevent deflocculation.
>
> RR
>
>
> >Hi,
> >Since Sulfur is a non-desirable element in glazes why would folks use
> >magnesium sulfate(Epsom Salts) in their glazes to thicken/suspend them?
> >If the glaze also contained Zinc would this lead to pinholing?
> >
> >Phil...
>
>
>
----------------------------------------------------------------------------
----
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
> Phone: 613-475-9544
> Fax: 613-475-3513
>
>
>
John K Dellow on sun 28 sep 03
That is correct Ababi.
Ababi wrote:
>Thank you John.
>If I understand you correctly:
>To add to the ready made with water glaze as "cure"?
>Not as the water of the glaze?
>
>
>
John Dellow "the flower pot man"
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
| |
|
