John Baymore on tue 8 jun 99
------------------
(clip)
how does it( Zinc Oxide) boil at a much lower temp than it melts........
AT.????.........Something is amiss here.=21=21=21. .Please correct with the=
with
good information..thanks.....
(snip)
Jim,
Zinc oxide doesn't. Zinc metal does. I think the confusion was from what
amounted to a =22brain typo=22 =3Cg=3E. The person who wrote the last post =
MEANT
to say zinc the second time, not zinc oxide......... but the hands just
added the word =22oxide=22 automatically.
Zinc oxide and zinc metal. Two different beasts =3Cg=3E. But the net =
result
is the same in the end......the zinc oxide aint' there to act as a flux on
the silica.
Zinc oxide is incredibly easy to reduce to the base metal. ZnO + (hot) CO
=3D Zn + CO2. If that happens...... just about assured in reduction firing
when the kiln is first kicked into what many potters call =22body
reduction=22........ the zinc oxide is changed (reduced......chemical term
for oxygen removed) to raw zinc metal. Zinc metal boils at a lower
temperature than zinc oxide becomes an active flux on silica. The raw zinc
volatilizes out of the glaze. Poof.....gone with the wind.
(Welll...... actually the flue gases....but =22gone with the draft=22 didn't
have the nice poetic ring =3Cg=3E).
BEst,
....................john
John Baymore
River Bend Pottery
22 Riverbend Way
Wilton, NH 03086 USA
603-654-2752
JBaymore=40compuserve.com
John.Baymore=40GSD-CO.COM
=22Earth, Water, and Fire climbing kiln firing workshop Aug. 20-29,1999=22
John Britt on sat 20 nov 99
I don't know if anyone else heard the report on NPR that officials are
concerned about baby powder harming children. Seems that the Zinc Oxide
contains lead. I though Monona might know more about this.
(I will be out of town when this message is posted and I will answer
responses in a week.)
--
Thanks,
John Britt claydude@unicomp.net
Dys-Functional Pottery
Dallas, Texas
http://www.dysfunctionalpottery.com/claydude
http://www.silverhawk.com/ex99/britt/welcome.html
John Tilton on fri 20 oct 00
Back in February of this year I began to do some experiments with zinc
crystal glazes. I had one bag of zinc oxide which was at least 20 years
old and which had come from Standard Ceramics in Carnegie PA. The bag
said Zo Chem on it and I found the company and talked with one of the
old timers and he said, " Yes we used to have this old kiln upstairs and
we made this special stuff but have not done so for many years. You
probably had that." ---- and he sent some samples which did not work.
I've tested many different zinc oxides and finally discovered a zinc
oxide which was not the same, but would work. It is called St Joe zinc
oxide.
Does anyone know of a supplier for this material? Is it still being
mined? Do you have some bags which you would be willing to sell?
Thanks in advance.
John
--
John Tilton
16211 NW 88th Terrace
Alachua, Fl. 32615
904-462-3762
Web site: http://www.tiltonpottery.com
mailto:tilton@atlantic.net
June Perry on fri 20 oct 00
John,
ZCA (Zinc Corporation of America) purchased St. Joe's in 1987. I think
they're part of Pony Industries. It's ZCA MINES, INC.
In a qucik web search I picked up this info:
ZCA Mines, Inc. was formed in 1987 with the acquisition of St. Joe Resources
and its mining properties and related facilities located near Balmat, New
York, not far from the St. Lawrence River. Zinc has been mined continuously
in the Balmat area for over 70 years. Today, the company's mines produce some
of the richest zinc bearing ores in the world. ZCA Mines utilizes
state-of-the-art technology and is one of the lowest cost zinc concentrate
producers. In addition to the underground operations, ZCA Mines facilities
include a mill which incorporates the most modern design concepts, such as
on-line analytical instruments to optimize recovery of the metal from the ore.
With this information, your local supplier might be able to order you some.
You can check with the 800 phone information for ZCA or Pony Industries.
I don't have more time at the moment to follow through on this today. I got a
call a while ago that my order of bricks, frit and my Skutt electric kiln
arrived today. We've just unloaded one load and Jim is off to pick up the
second one and I need to get a jump on dinner prep before he gets back with
that second load of bricks and hopefully, part of the kiln! :-)
I'm going to be playing around with crystalline, cone 10 tests and am going
to want to get some of this zinc myself. Do you know if it's calcined? I
think I trashed the elements in my little Axner cone 10 test kiln with four
consecutive firings of calcining zinc and I prefer not to do that again if I
don't have to. :-( If there's a next time, it's going in the gas kiln but my
preference is to purchase some good quality calcined zinc.
Warm regards,
June
Fabienne Micheline Cassman on fri 20 oct 00
At 09:28 AM 10/20/2000 -0400, you wrote:
Does anyone know of a supplier for this material? Is it still being
mined? Do you have some bags which you would be willing to sell?
Hello John,
I don't know about the Zinc Oxide you mention, but the following may be
worth a try. Eagle Zinc by Fusion Ceramics in Carrollton, Ohio is
equivalent to the French-processed ZnO which is supposed to be the best
available. I searched for that material and was assure by US Pigment
Corp., http://www.uspigment.com or 800-472-9500, that what they carry under
item code DENZOX (Calcined Zinc) is it. Bottom line, I tried it and
currently happily swimming in crystals :)
Cheers,
Fabienne
--
Milky Way Ceramics http://www.milkywayceramics.com/
Yes, I have learned from my mistakes...
I can reproduce them exactly.
ferenc jakab on sat 21 oct 00
> Back in February of this year I began to do some experiments with zinc
> crystal glazes. I had one bag of zinc oxide which was at least 20 years
> old and which had come from Standard Ceramics in Carnegie PA. The bag
> said Zo Chem on it and I found the company and talked with one of the
> old timers and he said, " Yes we used to have this old kiln upstairs and
> we made this special stuff but have not done so for many years. You
> probably had that." ---- and he sent some samples which did not work.
John,
I'm wondering if the original ZnO wasn't dense zinc oxide. It does behave
differently to "light" ZnO. His mention of the kiln was what makes me
wonder.
As a rule dense ZnO is better in glazes than "light ".
Feri.
Rikki Gill on wed 25 apr 01
Hi Ilene, Do you think you could sift some of it dry, and then weigh it? =
I
think that might work. Anyway hello, sounds like you've been busy since =
you
returned home from nceca. By for now, Rikki
-----Original Message-----
From: ILENE MAHLER
To: CLAYART@LSV.CERAMICS.ORG
Date: Wednesday, April 25, 2001 9:04 AM
Subject: Zinc Oxide
>Okay I was better this time but I want to be almost perfect..I rolled
>it with a rolling pin I banged it with a paddle and still had lumps.I
>will sift it dry then measure it.I will not buy a ball mill and have
>about 40 lbs left to bisque.What should I do to make it siftable I guess
>the small pieces will not melt...Running the kiln now with a new
>base..(chrystals) Help...Help...Help...Ilene in Conn...Cheryl will send
>out the 106 frit with recipes after Mothers day.................
>
>________________________________________________________________________=
___
___
>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.
>
ILENE MAHLER on thu 26 apr 01
would love to buy it that way after I use up the 40 lbs that I have
left...Thanks Ilene
Wade Blocker wrote:
>
> Have you tried buying calcined zinc oxide? It does not clump and is bet=
ter
> to use in glazes than ordinary zinc oxide, particularly if you need to =
add
> a larger percentage to a glaze.Mia in suddenly quite warm ABQ
>
> _______________________________________________________________________=
_______
> 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@pcl=
ink.com.
Ababi on thu 26 apr 01
I added some Zinc oxide to a bisque firing to 950C in your way ^08 than
closed in a good box. Hope it will be good enough
----- Original Message -----
From: "Wade Blocker"
To:
Sent: Thursday, April 26, 2001 12:39 AM
Subject: Re: Zinc Oxide
> Have you tried buying calcined zinc oxide? It does not clump and is bet=
ter
> to use in glazes than ordinary zinc oxide, particularly if you need to =
add
> a larger percentage to a glaze.Mia in suddenly quite warm ABQ
>
>
_________________________________________________________________________=
___
__
> 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.
>
Wade Blocker on thu 26 apr 01
Ilene,
You might try to calcine it in your next bisque firing. put a cupful o=
r
more into an unglazed bowl and fire it with your greenware. That should d=
o
the trick. Mia in ABQ
Snail Scott on sat 28 apr 01
I calcine my zinc at the bottom of the kiln
during low-temp bisque. It hits maybe ^012
or so. Never had to grind it - still powdery.
-Snail
Ababi on sat 28 apr 01
I calcined to 950C (08?) turned out the same. I believe the calcining is =
to
hit away the LOI. I prepared it for crystalline I thing has to be well
closed otherwise will get back some LOI - humidity!
Ababi
----- Original Message -----
From: "Paul Lewing"
To:
Sent: Friday, April 27, 2001 10:32 PM
Subject: Re: Zinc Oxide
> I do a lot of china painting and just tried calcining some zinc oxide i=
n
> a firing to cone 016. It came out soft and powdery. So maybe running
> it up to cone 06 is too high.
> Paul Lewing, Seattle
>
>
_________________________________________________________________________=
___
__
> 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.
>
Tommy Humphries on sat 28 apr 01
it just occurred to me... take two heavy firebricks (hard) and use them a=
s a
set of millstones...rubbing the lumps between them, it should grind it in=
to
a fine enough powder to use.
Tommy
----- Original Message -----
From: "ILENE MAHLER"
To:
Sent: Wednesday, April 25, 2001 8:41 AM
Subject: Zinc Oxide
> Okay I was better this time but I want to be almost perfect..I rolled
> it with a rolling pin I banged it with a paddle and still had lumps.I
> will sift it dry then measure it.I will not buy a ball mill and have
> about 40 lbs left to bisque.What should I do to make it siftable I gues=
s
> the small pieces will not melt...Running the kiln now with a new
> base..(chrystals) Help...Help...Help...Ilene in Conn...Cheryl will sen=
d
> out the 106 frit with recipes after Mothers day.................
>
>
_________________________________________________________________________=
___
__
> 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.
>
Ababi on sun 29 apr 01
Just pass it dry, through an 80# sieve.
----- Original Message -----
From: "Tommy Humphries"
To:
Sent: Sunday, April 29, 2001 2:29 AM
Subject: Re: Zinc Oxide
> it just occurred to me... take two heavy firebricks (hard) and use them=
as
a
> set of millstones...rubbing the lumps between them, it should grind it
into
> a fine enough powder to use.
>
> Tommy
>
> ----- Original Message -----
> From: "ILENE MAHLER"
> To:
> Sent: Wednesday, April 25, 2001 8:41 AM
> Subject: Zinc Oxide
>
>
> > Okay I was better this time but I want to be almost perfect..I rolle=
d
> > it with a rolling pin I banged it with a paddle and still had lumps.I
> > will sift it dry then measure it.I will not buy a ball mill and have
> > about 40 lbs left to bisque.What should I do to make it siftable I gu=
ess
> > the small pieces will not melt...Running the kiln now with a new
> > base..(chrystals) Help...Help...Help...Ilene in Conn...Cheryl will s=
end
> > out the 106 frit with recipes after Mothers day.................
> >
> >
>
_________________________________________________________________________=
___
> __
> > 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.
> >
>
>
_________________________________________________________________________=
___
__
> 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.
>
ILENE MAHLER on tue 19 jun 01
Okay I'm back..I fired the last crystal load using the most reliable
glaze.Instead of 4 shades of moss to bright green crystals etc. I got a
mason stain aqua with gold kaki crystals very nice but what happened
fired the same schedule same recipe same amount.Got an order for a gift
of the original 4 shades of green goblet..I made 5 to make sure I would
get one..Just as I was sanding and fitting I remembered that I used my
old zinc oxide for the first 3 batches, and the new for the last
different load.I was told they should be the same,I went on Suday am to
another potter to borrow a cup (actually a lb.'s he buys from the person
I got the original zinc from).Low and Behold I opened the kiln the 4
goblets that I used the glaze with the original zinc were the right
color,and the one with the glaze with the new zinc the aqua etc..I guess
its where you buy you chemicals from that makes all the difference..I am
going to get 50 lbs of the zinc when I order the new kiln..I guess that
I really have to start from scratch to test all the glazes I tried with
this new zinc..Not as Rocky either..Ilene in Conn
Avril Farley on tue 19 jun 01
would you be prepared to let me have your crystalline glaze recipe and
firing schedule, please. I want to experiment with crystals and it would
be good to have something tried and tested to work on . Can you also say
if you once fire or put glaze on biscuit, and what thickness, and if you
electric fire or reduce. Thank you, hopefully, Avril in the Forest of Dean
UK, avril@soudley44.freeserve.co.uk
----- Original Message -----
From: "ILENE MAHLER"
To:
Sent: Tuesday, June 19, 2001 4:35 PM
Subject: Zinc Oxide
> Okay I'm back..I fired the last crystal load using the most reliable
> glaze.Instead of 4 shades of moss to bright green crystals etc. I got a
> mason stain aqua with gold kaki crystals very nice but what happened
> fired the same schedule same recipe same amount.Got an order for a gift
> of the original 4 shades of green goblet..I made 5 to make sure I would
> get one..Just as I was sanding and fitting I remembered that I used my
> old zinc oxide for the first 3 batches, and the new for the last
> different load.I was told they should be the same,I went on Suday am to
> another potter to borrow a cup (actually a lb.'s he buys from the person
> I got the original zinc from).Low and Behold I opened the kiln the 4
> goblets that I used the glaze with the original zinc were the right
> color,and the one with the glaze with the new zinc the aqua etc..I guess
> its where you buy you chemicals from that makes all the difference..I am
> going to get 50 lbs of the zinc when I order the new kiln..I guess that
> I really have to start from scratch to test all the glazes I tried with
> this new zinc..Not as Rocky either..Ilene in Conn
>
>
____________________________________________________________________________
__
> 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.
>
ILENE MAHLER on wed 20 jun 01
I would suggest anyone trying crystals for the first time take a class
You can demolish you kiln,shelves etc. if you don't know about
pedestals, catch bowls,what kind of clay, fitting etc...Ilene
Avril Farley wrote:
>
> would you be prepared to let me have your crystalline glaze recipe and
> firing schedule, please. I want to experiment with crystals and it would
> be good to have something tried and tested to work on . Can you also say
> if you once fire or put glaze on biscuit, and what thickness, and if you
> electric fire or reduce. Thank you, hopefully, Avril in the Forest of Dean
> UK, avril@soudley44.freeserve.co.uk
>
> ----- Original Message -----
> From: "ILENE MAHLER"
> To:
> Sent: Tuesday, June 19, 2001 4:35 PM
> Subject: Zinc Oxide
>
> > Okay I'm back..I fired the last crystal load using the most reliable
> > glaze.Instead of 4 shades of moss to bright green crystals etc. I got a
> > mason stain aqua with gold kaki crystals very nice but what happened
> > fired the same schedule same recipe same amount.Got an order for a gift
> > of the original 4 shades of green goblet..I made 5 to make sure I would
> > get one..Just as I was sanding and fitting I remembered that I used my
> > old zinc oxide for the first 3 batches, and the new for the last
> > different load.I was told they should be the same,I went on Suday am to
> > another potter to borrow a cup (actually a lb.'s he buys from the person
> > I got the original zinc from).Low and Behold I opened the kiln the 4
> > goblets that I used the glaze with the original zinc were the right
> > color,and the one with the glaze with the new zinc the aqua etc..I guess
> > its where you buy you chemicals from that makes all the difference..I am
> > going to get 50 lbs of the zinc when I order the new kiln..I guess that
> > I really have to start from scratch to test all the glazes I tried with
> > this new zinc..Not as Rocky either..Ilene in Conn
> >
> >
> ____________________________________________________________________________
> __
> > 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.
> >
>
> ______________________________________________________________________________
> 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.
julene on wed 26 mar 03
I have seen some of this debate on the need for Zinc Oxide and would add
this. As I am still in kindergarten as far as glaze development, I have
chosen to use only the most basic ingredients until there is a need to add
something in the mix. I have tested some of the clear glazes that meet this
criteria to find the ones that produce the desired affects as totally clear,
or having clear and opaque areas. One glaze that I tested was the Chun
Clear cone 6 which is very high in Zinc Oxide. As a clear glaze it is not
my first pick, but it does do some interesting things. I believe that not
all glazes serve the same purpose and this could be useful in the right
situation.
I reference Cushing in his June 1977 Studio Pottery paper, in my belief that
many if not all high fire affects can be experienced in the mid-range also.
Since many of us are firing at this range, it does not cut us out of this
type of research.
The interesting affect that I found with the Chun Clear was not the clear
glaze by itself, but how it reacts with other glazes. Warning on this, a
little can go a long ways with some glazes as the saturated iron. The most
interesting affects that I have are when just the very rim, an upper portion
or possibly brushwork use the Chun Clear over a darker glaze. There is a
very dramatic affect. In some cases the base glaze appears to be almost
bleached out without affecting the area outside of its application. In
other cases, it allows for the growth of microcrystals down the side of the
pot.
What this causes me to wonder, is why the debate on the use of zinc oxide?
Clearly if one is able to see this type of affect from its use at cone 6,
one can speculate that it is affecting final results of the cone 10 firing
even if it does not stick around for the whole show. I have chosen not to
use zinc oxide, until/unless I want an affect only obtainable from its use.
Why not just test your glazes, with and without, and see which you prefer?
Julene, an American voice in the wilderness, one of the tired, the poor, and
the rejected, with new strong roots in a land that has a wellspring fed by
waters distilled from all lands, purified by nature to nourish
indiscriminately as the rain.
Sandi Taylor on tue 17 aug 04
I HAVE MADE NUMEROUS GLAZES FOR OUR STUDIO BUT I HAVE ALWAYS HAD =
PROBLEMS GETTING THE ZINC OXIDE TO GO INTO SUSPENSION.=20
I HAVE PUT IT IN A BLENDER WITH POOR RESULTS.=20
DOES ANYONE HAVE AN ANSWER TO THIS SITUATION.???
IT IS QUITE FRUSTRATING TO HAVE TO SHIEVE THE GLAZE 6-7 TIMES BEFORE THE =
ZINC OXIDE IS BROKEN DOWN ENOUGH TO GO THROUGH THE MESH.
THANKS SO MUCH
SANDI TAYLOR
BRADENTON, FLA.
EMAIL IS SANDI.TAYLOR2@VERIZON.NET
-------------------------------------------------------------------------=
-------
=20
Snail Scott on tue 17 aug 04
At 12:03 PM 8/17/2004 -0400, you wrote:
>...PROBLEMS GETTING THE ZINC OXIDE TO GO INTO SUSPENSION.
>I HAVE PUT IT IN A BLENDER WITH POOR RESULTS...
>IT IS QUITE FRUSTRATING TO HAVE TO SHIEVE THE GLAZE 6-7 TIMES BEFORE THE
ZINC OXIDE IS BROKEN DOWN ENOUGH TO GO THROUGH THE MESH...
Do you mean that it's chunky? Just calcine
it; it'll convert back into a nice powder.
Put it into an unglazed bowl and cook it
up with your next bisque firing.
-Snail Scott
Cynthia Bracker on tue 17 aug 04
Try dissolving it in hot or perhaps even boiling water (but be sure to
deduct this amount from the water you add to the rest of the glaze batch)
Cindy
Sandi Taylor wrote:
>I HAVE MADE NUMEROUS GLAZES FOR OUR STUDIO BUT I HAVE ALWAYS HAD PROBLEMS GETTING THE ZINC OXIDE TO GO INTO SUSPENSION.
>I HAVE PUT IT IN A BLENDER WITH POOR RESULTS.
>DOES ANYONE HAVE AN ANSWER TO THIS SITUATION.???
>IT IS QUITE FRUSTRATING TO HAVE TO SHIEVE THE GLAZE 6-7 TIMES BEFORE THE ZINC OXIDE IS BROKEN DOWN ENOUGH TO GO THROUGH THE MESH.
>THANKS SO MUCH
>SANDI TAYLOR
>BRADENTON, FLA.
>EMAIL IS SANDI.TAYLOR2@VERIZON.NET
>
>
>
>--------------------------------------------------------------------------------
>
>
>______________________________________________________________________________
>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.
>
>
>
>
Ilene Mahler on tue 17 aug 04
put your zinc in a bisued pot and fire it to 1000 degrees if it doesn't work
buy new zinc and do this...Ilene in Conn ready to start to work again
----- Original Message -----
From: "Sandi Taylor"
To:
Sent: Tuesday, August 17, 2004 12:03 PM
Subject: ZINC OXIDE
I HAVE MADE NUMEROUS GLAZES FOR OUR STUDIO BUT I HAVE ALWAYS HAD PROBLEMS
GETTING THE ZINC OXIDE TO GO INTO SUSPENSION.
I HAVE PUT IT IN A BLENDER WITH POOR RESULTS.
DOES ANYONE HAVE AN ANSWER TO THIS SITUATION.???
IT IS QUITE FRUSTRATING TO HAVE TO SHIEVE THE GLAZE 6-7 TIMES BEFORE THE
ZINC OXIDE IS BROKEN DOWN ENOUGH TO GO THROUGH THE MESH.
THANKS SO MUCH
SANDI TAYLOR
BRADENTON, FLA.
EMAIL IS SANDI.TAYLOR2@VERIZON.NET
----------------------------------------------------------------------------
----
____________________________________________________________________________
__
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.
Alice DeLisle on thu 5 aug 10
I just use up some zinc oxide that I had bought. It was white in color and
pretty low density. I also have some "zinc oxide" that I got from a commun=
ity
pottery studio that was cleaning house. The appearance is very different f=
rom
what I had previously. It is slightly greenish in color and very dense. I=
t is
probably quite old. Has anybody had experience with zinc oxide that fits t=
his
description? I looked up the MSDS for description and it said "white to
yellow", insoluble in water, slightly soluble in dilute acetic acid. Maybe=
I
should try putting some in vinegar to see if it dissolves. Any advice?
Alice DeLisle
wanderland@att.net
http://delisle.aftosawebhosting.com
http://www.etsy.com/shop/IslandTextures
| |
|
