Ellie Blair on fri 6 aug 04
Scott
----- Original Message -----=20
From: Scott Paulding=20
To: CLAYART@LSV.CERAMICS.ORG=20
Sent: Friday, August 06, 2004 1:20 PM
Subject: zinc...again...
.
Is there an oxide that behaves similarly to Zn in a glaze, or a =
mineral that
has Zn in it?
You need to use calcined zinc oxide. It is small enough to go through =
a 120 sieve. You can do this yourself by taking the zinc you have and =
bisque it to 010 just enough to dry it out then run it through your ball =
mill. It will be the same.
Good luck
Ellie Blair
=3D=3D=3D=3D=3D
"I should have been a plumber."
-Albert Einstein
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Scott Paulding on fri 6 aug 04
Hello All,
Some of you may remember, I was asking if Zinc just vaporizes of the pot at
cone 10 redux. Well, I decided to just try the recipe w/out the zinc in it.
Well, as it turns out, for this glaze, the zinc does flux it, and seems to help
promote rivuletting (as does the 30% whiting in it). So, I was wondering if
anyone had suggestions on how to add zinc to a glaze w/out using zinc oxide,
or, of this were even possible.
I ask, because my only experience with ZnOX is that it is a really hard
ingredient to use w/out a ball mill. I say this because the only form I've seen
it in is that it's almost granular, and very, very hard to get through a sieve.
Is there an oxide that behaves similarly to Zn in a glaze, or a mineral that
has Zn in it?
I look forward to hearing back. Thanks,
-scott
=====
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-Albert Einstein
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Mary K on fri 6 aug 04
Your zinc just needs to be fired in a bisque bowl to cone 04 before you use it. This is called "calcined zinc" .Crystallieri's do this always before making up glaze recipes for crystals. The uncalcined zinc is holding a large amount of water which affects it's consistency and weight. You will find it sieves very easily after firing, just like baby powder. Hope this helps.........Mary Kilbreath
Scott Paulding wrote:Hello All,
Some of you may remember, I was asking if Zinc just vaporizes of the pot at
cone 10 redux. Well, I decided to just try the recipe w/out the zinc in it.
Well, as it turns out, for this glaze, the zinc does flux it, and seems to help
promote rivuletting (as does the 30% whiting in it). So, I was wondering if
anyone had suggestions on how to add zinc to a glaze w/out using zinc oxide,
or, of this were even possible.
I ask, because my only experience with ZnOX is that it is a really hard
ingredient to use w/out a ball mill. I say this because the only form I've seen
it in is that it's almost granular, and very, very hard to get through a sieve.
Is there an oxide that behaves similarly to Zn in a glaze, or a mineral that
has Zn in it?
I look forward to hearing back. Thanks,
-scott
=====
"I should have been a plumber."
-Albert Einstein
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David Hendley on fri 6 aug 04
If you had to ball mill your glaze with zinc oxide, it was because
you got ahold of old zinc oxide. It is known for getting hard
and lumpy if it sits around for a long time.
Buy a fresh bag and you will have no problems.
Or, you can calcine (fire to a low temperature) your lumpy
zinc to renew it.
The only other source of zinc that I have ever seen in ceramic
supply catalogs is frit that contains zinc.
David Hendley
david@farmpots.com
http://www.farmpots.com
----- Original Message -----
> I ask, because my only experience with ZnOX is that it is a really hard
> ingredient to use w/out a ball mill. I say this because the only form I've
seen
> it in is that it's almost granular, and very, very hard to get through a
sieve.
> Is there an oxide that behaves similarly to Zn in a glaze, or a mineral
that
> has Zn in it?
>
Mary K on sat 7 aug 04
Hi John,
re: zinc oxide.....I think it comes from living in south florida, where on an average day you could hang out wash (who has a clothesline these days?) and by dusk bring it in just as wet, no, wetter than when you put it out, and where candles left anywhere but inside in the AC take on the shape of whatever surrounds them. Zinc in this state weighs about double what it would weigh in Arizona (no, I haven't tested it) My supplier doesn't seal it up tight, so if it has been in the shop long it resembles hard cottage cheese, yuck. But, I think you are correct about the temperature John, maybe I have been doing a little overkill?( I just stick it in with my bisque load, then seal it up tight, ....baby powder) I just moved to south Florida and have not set up my studio yet, but to my surprise and delight, discovered last evening that my garage is AIR CONDITIONED!!! Now, if I can find a few potters around here, it will be hot heaven! :)
Mary.......making sure the electric bill is paid first!
John Hesselberth wrote:
On Friday, August 6, 2004, at 06:48 PM, Mary K wrote:
> Your zinc just needs to be fired in a bisque bowl to cone 04 before
> you use it. This is called "calcined zinc" .Crystallieri's do this
> always before making up glaze recipes for crystals. The uncalcined
> zinc is holding a large amount of water which affects it's consistency
> and weight. You will find it sieves very easily after firing, just
> like baby powder.
Hi Mary and everyone,
I am curious about this. I have never found it necessary to calcine
zinc oxide. There are no published hydrates of zinc oxide--at least not
in my Handbook. I bought some zinc oxide yesterday that came from my
supplier (DelVal) "just like baby powder" in consistency. The last of
the batch I've had in my studio is "just like baby powder" after
sitting there for several years. I never have any trouble getting it
well dispersed in a glaze slurry straight out of the bag.
So where is this lumpiness coming from? Are there different grades
being sold to us? I know my supplier is very careful about the quality
of the material she buys. Or is it absorbing unbound moisture from a
humid environment? If this were the case heating only above 212F should
return it to is "baby powder" consistency--calcining should not be
necessary. Has anyone else had my experience or am I standing out there
alone on this one? Any ideas??
Regards,
John
John Hesselberth
http://www.frogpondpottery.com
http://www.masteringglazes.com
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Ivor and Olive Lewis on sat 7 aug 04
Dear Scott Paulding,
I suggest you seek a supplier of industrial chemicals and ask for Zinc
Orthosilicate (Zn2.SiO4). This compound should be freely soluble in a
silicate melt and will perhaps be less prone to the effects of a
reducing atmosphere.
There is also a chemical called Zinc Perborate or Zinc Borate which
might be a useful fluxing agent.
Try
ALL-CHEMIE LTD.
1429 John Street
Fort Lee, NJ 07024-2501
USA
This came up in a Google search.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
John Hesselberth on sat 7 aug 04
On Friday, August 6, 2004, at 06:48 PM, Mary K wrote:
> Your zinc just needs to be fired in a bisque bowl to cone 04 before
> you use it. This is called "calcined zinc" .Crystallieri's do this
> always before making up glaze recipes for crystals. The uncalcined
> zinc is holding a large amount of water which affects it's consistency
> and weight. You will find it sieves very easily after firing, just
> like baby powder.
Hi Mary and everyone,
I am curious about this. I have never found it necessary to calcine
zinc oxide. There are no published hydrates of zinc oxide--at least not
in my Handbook. I bought some zinc oxide yesterday that came from my
supplier (DelVal) "just like baby powder" in consistency. The last of
the batch I've had in my studio is "just like baby powder" after
sitting there for several years. I never have any trouble getting it
well dispersed in a glaze slurry straight out of the bag.
So where is this lumpiness coming from? Are there different grades
being sold to us? I know my supplier is very careful about the quality
of the material she buys. Or is it absorbing unbound moisture from a
humid environment? If this were the case heating only above 212F should
return it to is "baby powder" consistency--calcining should not be
necessary. Has anyone else had my experience or am I standing out there
alone on this one? Any ideas??
Regards,
John
John Hesselberth
http://www.frogpondpottery.com
http://www.masteringglazes.com
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