Bacia Edelman on wed 18 mar 98
Someone asked about plastic vitrox and a substitute. I deleted the Digest
with that post already but found a scribbled note that may not be too
helpful as it requires TESTING. The note says to substitute Nepheline
Syenite and also says to use Ball Clay in the recipe rather than EPK. Your
post (was it a Barbara Lewis?) gave the recipe you needed to work with, and
I can't check to see which clay if any it required.
I also phoned my local supplier who doesn't stock it but says Laguna does.
Looked in that catalog and no soap. Perhaps you could phone Laguna's 800
no. and ask them and ask also if they have a minimum order. Sorry this is
so vague. Bacia Edelman Madison, WI
Peter Atwood on wed 21 jul 99
Hi Everyone,
I recently came across a recipe in Claytimes that calls for plastic vitrox.
What the heck is that? Incidentally, last week at a craft show a potter I
was talking to told me that he oversprays all of his work with the same
50-50 mix of plastic vitrox and gerstley borate that was merntioned in the
Claytimes article. He says it helps eliminate pinholes and also gives him
some movement and interest in the surfaces. One of the effects was a shiny
to matt variation where he had sprayed it over a matt green glaze. It was
very nice. His recomendation to me was for ^10 to change the proportion to
70 plastic vitrox and 30 gerstley borate.
Peter Atwood
_______________________________________________________________
Get Free Email and Do More On The Web. Visit http://www.msn.com
Khaimraj Seepersad on thu 22 jul 99
Plastic Vitrox -
A California Feldspar Mineral .
78.70 Si02
12.80 Al203
0.09 Fe203
0.28 Ca0
7.35 K20
source -Advanced Ceramic Manual - J.Conrad .
Supplied by Ceramic Supply of N.Y and N.J , Inc.
problems can be Iron oxide contamination .
-----Original Message-----
From: Peter Atwood
To: CLAYART@LSV.UKY.EDU
Date: 21 July 1999 10:21
Subject: plastic vitrox
----------------------------Original message----------------------------
Hi Everyone,
I recently came across a recipe in Claytimes that calls for plastic vitrox.
What the heck is that? Incidentally, last week at a craft show a potter I
was talking to told me that he oversprays all of his work with the same
50-50 mix of plastic vitrox and gerstley borate that was merntioned in the
Claytimes article. He says it helps eliminate pinholes and also gives him
some movement and interest in the surfaces. One of the effects was a shiny
to matt variation where he had sprayed it over a matt green glaze. It was
very nice. His recomendation to me was for ^10 to change the proportion to
70 plastic vitrox and 30 gerstley borate.
Peter Atwood
_______________________________________________________________
Get Free Email and Do More On The Web. Visit http://www.msn.com
Ben Shelton on thu 22 jul 99
It's a feldspathic clay that is fused totally at cone ten.
-----Original Message-----
From: Peter Atwood
To: CLAYART@LSV.UKY.EDU
Date: Wednesday, July 21, 1999 1:22 PM
Subject: plastic vitrox
----------------------------Original message----------------------------
Hi Everyone,
I recently came across a recipe in Claytimes that calls for plastic vitrox.
What the heck is that? Incidentally, last week at a craft show a potter I
was talking to told me that he oversprays all of his work with the same
50-50 mix of plastic vitrox and gerstley borate that was merntioned in the
Claytimes article. He says it helps eliminate pinholes and also gives him
some movement and interest in the surfaces. One of the effects was a shiny
to matt variation where he had sprayed it over a matt green glaze. It was
very nice. His recomendation to me was for ^10 to change the proportion to
70 plastic vitrox and 30 gerstley borate.
Peter Atwood
_______________________________________________________________
Get Free Email and Do More On The Web. Visit http://www.msn.com
will edwards on tue 10 oct 00
Mary, =
Heres what I have to go on.
(Plastic Vitrox Clay)
0.536 K2O 1.188 Al2O3 13.040 SiO2
0.053 Na2O 0.015 Fe2O3 0.005 TiO2
0.089 CaO
0.321 MgO
Perhaps there's others who have more to offer? =
WM. Edwards
____________________________________________________________________
Get free email and a permanent address at http://www.netaddress.com/?N=3D=
1
Mary Higgins on tue 10 oct 00
A few months ago I bought a kiln, wheel, several hundred pounds of dried
up clay (porcelain, stoneware, red earthenware). There also a number of
dried up glazes, powdered glazes, and glaze components. One of these is
a bag (probably 10 pounds) of Plastic Vitrox. Are there any good stable
glazed using this material. I noticed a couple of glazes in the archives
with about 3 ingredients that call for pv. Does anyone know anything
about how to use this stuff?
Thanks
Mary in Florida
Hank Murrow on tue 10 oct 00
Mary wrote;
One of these is
>a bag (probably 10 pounds) of Plastic Vitrox. Does anyone know anything
>about how to use this stuff?
Dear Mary;
Plastic Vitrox is a sort of 'petuntse', though it is not marketed as such;
which is mined in CA. It is half way in the chemical continuum between
potash feldspar and silica; and mildly plastic. I use it in my porcelain
body, and some glazes. I find it to be a very useful material and have
about a ton and a half on hand.
Try it, Hank in Eugene
Patrick S. Powell on wed 11 oct 00
Mary -
PV CLAY (plastic vitrox) is a California material produced by PROTECH =
MINERALS, 17092 D Street, Victorville, CA 92392, Phone (760) 245-3441. =
It is the feldspathic clay material.
This material is commonly used in plastic bodies in the west. It is =
readily available from CLAYWORLD and other pottery supply houses (again =
mostly in the western USA).
Published (but dated approx. 1995) chemical analysis is:
Silicon Dioxide 76.5
Aluminum Oxide 12.7
Titanium Dioxide 0.1
Ferric Oxide 0.5
Calcium Oxide 1.0
Magnesium Oxide 0.5
Potassium Oxide 5.0
Sodium Oxide 0.9
LOI 2.8
Hope this helps.
Pat
Patrick S. Powell
Vice President, Sales and Marketing
CLAYWORLD
PO Box 100
Hickory, KY 42001-0100
USA
Phone: 800 242-6885
270 247-3849
Fax: 270 247-1842
Email: psp@clayworld.com
Website: www.clayworld.com
GORMO1@AOL.COM on tue 31 jul 01
can anybody give me some information on plastic vitrox? Is it mined or is it
a made product?
Jim gorman
scott lykens on tue 31 jul 01
i had always been under the impression that it was a naturally occuring
feldspathic clay, and was merely processed in a specific way . That is , it
was wet mill processed , aka plastic vitrox.
the chem analysis i have is
SiO2 76.5
MgO .5
CaO 1.
Al2O3 12.7
TiO2 .1
K2O 5.
Na2O .9
Fe2O3 .5
LOI 2.8
you could ask protech more.
760-245-3441 . Pacific time.
Sct
>From: GORMO1@AOL.COM
>Reply-To: Ceramic Arts Discussion List
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: plastic vitrox
>Date: Tue, 31 Jul 2001 14:11:22 EDT
>MIME-Version: 1.0
>Received: from [209.115.31.35] by hotmail.com (3.2) with ESMTP id
>MHotMailBD30414D002840043109D1731F230BE42; Tue, 31 Jul 2001 11:18:57 -0700
>Received: from LSV (209.115.31.36) by mail.acers (Worldmail 1.3.167); 31
>Jul 2001 13:57:50 -0400
>Received: from LSV.CERAMICS.ORG by LSV.CERAMICS.ORG (LISTSERV-TCP/IP
>release 1.8d) with spool id 34677 for CLAYART@LSV.CERAMICS.ORG;
>Tue, 31 Jul 2001 13:55:48 -0400
>Received: from 152.163.225.102 by LSV.CERAMICS.ORG (SMTPL release 1.0d)
>with TCP; Tue, 31 Jul 2001 13:50:52 -0400
>Received: from GORMO1@aol.com by imo-r06.mx.aol.com (mail_out_v31.9.) id
> 1.35.18914ac8 (4255) for ; Tue, 31 Jul
>2001 14:11:22 -0400 (EDT)
>From owner-clayart@LSV.CERAMICS.ORG Tue, 31 Jul 2001 11:20:23 -0700
>Approved-By: melpots2@PCLINK.COM
>X-Mailer: AOL 5.0 for Mac sub 29
>Message-ID: <35.18914ac8.28984eca@aol.com>
>Sender: Ceramic Arts Discussion List
>
>can anybody give me some information on plastic vitrox? Is it mined or is
>it
>a made product?
>Jim gorman
>
>______________________________________________________________________________
>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.
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
Hank Murrow on tue 31 jul 01
>can anybody give me some information on plastic vitrox? Is it mined or is it
>a made product?
>Jim gorman
>
Dear Jim;
PV clay is a hydrothermally altered rhyolite (had half its alkaline
content dissolved away) and is somewhat like Cornwall Stone. Here is the
last analysis I had:
Plastic Vitrox Clay
Cost/lb: $.1075
Silica/Alumina ratio: 11.0:1
Equivalent Molecular Weight: 844.786
Molecular Formula of Plastic Vitrox Clay:
K20 0.451 Al2O3 1.000 SiO2 10.976
Na2O 0.045 Fe2O3 0.013 TiO2 0.005
CaO 0.075 LOI 1.154
MgO 0.270
Percentage Analysis
78.03 % SiO2
12.07 % Al2O3
5.03 % K2O
0.33 % Na2O
1.29 % MgO
0.50 % CaO
0.24 % Fe2O3
0.05 % TiO2
2.46 % L.O.I.
______________
100.00 % TOTAL
Comments:
Johns-Manville Corp. brand
Actually, this is a pretty fair stateside Petuntse! Hope you find this
useful, Hank in Eugene
Alisa og Claus Clausen on wed 1 aug 01
Dear Jim,
At some point I tested a Chris Wolff glaze from C.M. that called for that
material. It was unknown to me. Look it up in the arhcives by name, and
there is an explanation there. I subbed soda Feldspar in one test and
Cornwall stone in another, with good results.The percent in the recipe
was 15.
Best regards,
Alisa in Denmark
Hank Murrow on thu 29 apr 04
Dear Mel;
Plastic Vitrox is a hydrothermally altered Rhyolite (yes, that stuff I
keep claiming is the basis for Jingdezhen porcelain). It is mined in
California near San Diego, and once had the formula:
K2O = .536, Na2O = .053, CaO = .321, Al2O3 = 1.188, SiO2 = 13.04
MW = 1003 Si/Al ratio = 11:1
It is mildly plastic, making the basis for a nice vitreous white
porcelain body with suitable (to your taste) additions of spar and
kaolins (suggest Grolleg). YMMV, but I love the stuff!
Cheers, Hank
On Apr 29, 2004, at 7:00 PM, mel jacobson wrote:
> i have looked in fornier, and hammer.
> what the hell is plastic vitrox.
> me thinks it is a form of feldspar.
> ???
> mel
mel jacobson on thu 29 apr 04
i have looked in fornier, and hammer.
what the hell is plastic vitrox.
me thinks it is a form of feldspar.
???
mel
From:
Minnetonka, Minnesota, U.S.A.
web site: my.pclink.com/~melpots
or try: http://www.pclink.com/melpots
new/ http://www.rid-a-tick.com
David Hendley on thu 29 apr 04
Plastic Vitrox is unique, at least in my cabinet of ceramic materials.
It is kind of like a potash feldspar, but with generous quantities of
calcium, magnesium, and soda, too.
It also has much more alumina and silica than usual feldspars, so
it does not have as much fluxing power as feldspar.
Plus, plastic vitrox really is plastic. It is possible, but not easy, to
mix it with water to clay consistency and throw a cup, something
you could never do with feldspar.
So, I think of it, both it's physical properties and chemical properties,
as a like mix of feldspar and kaolin. It is useful in both claybodies and
glazes. I find it to be a good addition to slip-glazes, contributing
both fluxes and the good characteristics of clay.
David Hendley
david@farmpots.com
http://www.farmpots.com
----- Original Message -----
> i have looked in fornier, and hammer.
> what the hell is plastic vitrox.
> me thinks it is a form of feldspar.
> ???
> mel
>
Lee Love on fri 30 apr 04
Hank Murrow wrote:
> Plastic Vitrox is a hydrothermally altered Rhyolite (yes, that stuff I
> keep claiming is the basis for Jingdezhen porcelain). It is mined in
> California near San Diego, and once had the formula:
Hank,
My first post didn't make the trip so I am sending the info
again. I was looking at P.V. recently and found that it compared
favorable with Terrayama stone, you can see below. Shimaoka's
grandson Kay, called Terrayama and Amakusa stone "porcelain stone."
P.V. % 0.29 Na2O 6.81 K2O 0.2 MgO 0.22 CaO 14.87 Al2O3
75.56 SiO2 0.09 Fe2O3 2.04 LOI
Terrayama: %.360 Na2O .040 K2O .080 MgO .190 CaO 14.130 Al2O3
79.070 SiO2 .590 Fe2O3 5.550 LOI
Amakusa: % 3.12 K2O 0.18 MgO 0.17 CaO 15.13 Al2O3 77.21 SiO2
0.36 Fe2O3 3.99 LOI
Hamada used both these stones in his glazes. When fired
in oxidation, his Nami Jiro over ochre slip would often go blue. I
just glazed up 27 tests using Amakusa stone and ash. My last tests on
Amakusa and my grapevine ash turned out pretty nice, much better than my
tests with ash and ball clay. I'll put up photos soon.
--
Lee in Mashiko, Japan http://mashiko.org
Ivor and Olive Lewis on fri 30 apr 04
Dear Mel,
Back to basics !
Glen Nelson, "Ceramics" tells us that it is mined in California as a
complex mineral of Potash, Alumina and Silica and gives us 1 RO-1.69
Al2O3-!4.64 SiO2 as a general formula.
4th Ed, p310 gives a fuller picture and says more about the RO
fraction..
Hamer is UK so he might not be aware of the stuff
Best regards,
Ivor Lewis. Redhill, South Australia
David Beumee on sat 1 may 04
Hank wrote:
> It is mildly plastic, making the basis for a nice vitreous white
> porcelain body with suitable (to your taste) additions of spar and
> kaolins (suggest Grolleg).
This is misleading information. "Plastic" Vitrox isn't plastic at all.
The material is in a category of shortness all by itself, even wet mixed
as a slurry and dried out to "workable" consistency.
David Beumee
Earth Alchemy Pottery
Lafayette, CO
> Dear Mel;
>
> Plastic Vitrox is a hydrothermally altered Rhyolite (yes, that stuff I
> keep claiming is the basis for Jingdezhen porcelain). It is mined in
> California near San Diego, and once had the formula:
>
> K2O = .536, Na2O = .053, CaO = .321, Al2O3 = 1.188, SiO2 = 13.04
>
> MW = 1003 Si/Al ratio = 11:1
>
> It is mildly plastic, making the basis for a nice vitreous white
> porcelain body with suitable (to your taste) additions of spar and
> kaolins (suggest Grolleg). YMMV, but I love the stuff!
>
> Cheers, Hank
>
> On Apr 29, 2004, at 7:00 PM, mel jacobson wrote:
>
> > i have looked in fornier, and hammer.
> > what the hell is plastic vitrox.
> > me thinks it is a form of feldspar.
> > ???
> > mel
>
> ______________________________________________________________________________
> 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.
Lee Love on sun 2 may 04
A potter in Japan who is on the woodkiln list just told me that
Amakusa stone/clay is what they use for porcelain clay in Arita.
While I was in apprenticeship, we took over to the clay processor, a
truck load of large white stones, some big enough that two people were
needed to lift them. They were stacked behind one of the big storage
sheds. They were pulverized by a Rube Goldberg contraption, that
acted as a hammer mill. It used a big old electric motor, large wide
belts and strange cams on a shaft that lifted up the big hammers.
A sample of the white power was brought over for Sensei to
approve before the final delivery. I was surprised to note that it was
fluffy and seemed to contain moisture. This moisture might be a
problem if you were using dry measure and scales for mixing glazes, but
it isn't a problem if you are wet mixing and using ladle measures.
It is very different than what we do in America. I realized with my
first batch of wet mixed glaze, that the wood ash needs to be washed
throughly to get a proper measure because it greatly effects the
thickness of the glaze.
Depending upon the tests of newly washed ash for the Nami Jiro
standard glaze, which is typically 50% ball clay and 50% ash, with 5% to
25% kaolin added, sometimes amakusa was substituted for ball clay.
I have it written down somewhere. I think the last nami jiro batch I
used there was 8 parts amakusa and 3 parts ash. I was surprised to
see this on the tag wired on to the plastic trash can of glaze.
--
Lee in Mashiko, Japan http://mashiko.org
Hank Murrow on sun 2 may 04
On May 2, 2004, at 3:10 PM, Des & Jan Howard wrote:
>
> K2O 0.83
> Na2O 0.17
> Fe2O3 0.285
> Al2O3 4.713
> SiO2 35.193
I have entered this in my database as New South Wales Rhyolite. This
stuff is really weathered! Hardly any alkaline content left. The stuff
I use for glazes looks like this:
K2O, 0.400, Na2O, 0.350, CaO, 0.160, MgO, 0.090, Al2O3, 0.880, FeO,
0.060, Fe2O3, 0.100, SiO2, 9.800, TiO2, 0.020. MW 772.143, Si/Al ratio
11.1/1
This material is a glaze with the addition of 5% each of Wollastonite
and talc.
The stuff I use for bodies has around 4-5% KNa, and comes out of the
deposit with a pickaxe, but crushes and balls easily to inmcrease the
plasticity from the sericitic component. it throws very nicely all by
itself. i add a little Neph Sye to soak up the free silica so it won't
develop cristobalite. This material is called Calf Ridge
Porcelainstone, and it is a rich light mahogany color at C/10 from iron
and rutile contamination brought in during the hydrothermal alteration
phase.
Cheers, Hank
Sherrill Eatherly on sun 2 may 04
One supplier gave me their recipe for plastic vistrox:
Silica 37%
Potash G200 45%
Ball Clay OM4 18%
Sherrill Eatherly
----- Original Message -----
From: "mel jacobson"
To:
Sent: Thursday, April 29, 2004 9:00 PM
Subject: plastic vitrox
> i have looked in fornier, and hammer.
> what the hell is plastic vitrox.
> me thinks it is a form of feldspar.
> ???
> mel
> From:
> Minnetonka, Minnesota, U.S.A.
> web site: my.pclink.com/~melpots
> or try: http://www.pclink.com/melpots
> new/ http://www.rid-a-tick.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.
Des & Jan Howard on sun 2 may 04
Hank
The altered rhyolite we dig 3 km, as the galah flies, over the hill from the workshop has this
analysis.
SiO2 78.53
Al2O3 17.84
Fe2O3 1.69
K2O 1.7
Na2O 0.25
CaO 0.321
As you say mildly plastic, sorta between cheddar cheese & soft wax.
We use it in our main claybody, 10%, the mealiness appears to provide tooth without bite.
Des
Hank Murrow wrote:
> Plastic Vitrox is a hydrothermally altered Rhyolite (yes, that stuff I
> keep claiming is the basis for Jingdezhen porcelain). It is mined in
> California near San Diego, and once had the formula:
>
> K2O = .536, Na2O = .053, CaO = .321, Al2O3 = 1.188, SiO2 = 13.04
>
> MW = 1003 Si/Al ratio = 11:1
>
> It is mildly plastic, making the basis for a nice vitreous white
> porcelain body with suitable (to your taste) additions of spar and
> kaolins (suggest Grolleg). YMMV, but I love the stuff!
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.hwy.com.au
Des & Jan Howard on mon 3 may 04
Oops!!
Included something I shouldn't have (thx Hank). Corrected figures below.
SiO2 78.53
Al2O3 17.84
Fe2O3 1.69
K2O 1.7
Na2O 0.25
K2O 0.83
Na2O 0.17
Fe2O3 0.285
Al2O3 4.713
SiO2 35.193
YMMV my MF calcs are done using a spreadsheet.
Des
<
Hank
The altered rhyolite we dig 3 km, as the galah flies, over the hill from the workshop has this
analysis.
SiO2 78.53
Al2O3 17.84
Fe2O3 1.69
K2O 1.7
Na2O 0.25
CaO 0.321
>
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.hwy.com.au
Stephen on wed 5 may 04
I made slip glazes with plastic vitrox once for wood fired stoneware
applied to greenware. They were like butter in apearance. The recepies are
in Nov. 2001 issue of ceramics monthly. I didn't have any good pictures.
Stephen
I just found the article.
It was 50% P V clay / 50% gerstley borate. I added various amounts of
superpax, rutile, and cobalt.
David Hendley on thu 3 mar 05
Plastic Vitrox is also sometimes called PV clay.
It is not very plastic, but it is possible to mix straight PV with water
and throw a small pot with it - hard but possible.
The fired result @ cone 10 is a very dense, vitrified-looking pot - just
what you would expect for a clay with very a high percentage of fluxes.
I like to think of PV as a naturally occurring combination of kaolin and
feldspar. I think it could replace some of the clay and feldspar in just
about any glaze recipe.
It is also a useful material for white porcelain-like stoneware claybodies.
As for your blue-green celadon, it looks like a pretty average cone 10
celadon, but it would be easier to tell from the formula rather than the
recipe. The Grolleg kaolin is used, rather than EPK, because it is
low in titanium, which is known to shift the blue in blue celadon to green.
David Hendley
I don't know nothin' but the blues, cobalt that is.
david@farmpots.com
http://www.farmpots.com
----- Original Message -----
> Plastic Vitrox is an interesting material.
> The Ceramics Info Database calls it an aggregate of clay, spar, mica and
> silica, and suggests it can be used in clay bodies and glazes.
>
Paul Lewing on thu 3 mar 05
on 3/3/05 4:17 PM, David Hendley at hendley@TYLER.NET wrote:
> I like to think of PV as a naturally occurring combination of kaolin and
> feldspar. I think it could replace some of the clay and feldspar in just
> about any glaze recipe.
When I was in school, we used PV Clay and colemanite and nothing else to
make a clear glaze. Then you couldn't get colemanite, so we used Gerstley
Borate. At about cone 1-3, we'd mix the two half and half. For low-fire,
use more flux, for high-fire, more PV.
Paul Lewing, Seattle
ASHPOTS@AOL.COM on thu 3 mar 05
Ive been using PV 50% Ash 50 % with 2 % cobalt carb and also 50 % PV and ash
50 % with 3 % copper carb,, yummy,,,
i love simple glazes ,, and of course 50 ash 50 red art
KISS,, keep it simple stupid..
Kissed on Lookout Mountain
Mark
ASHPOTS@AOL.COM on fri 4 mar 05
Yup, im hoping to bring a case
Mark
Bruce Girrell on fri 4 mar 05
Paul Lewing wrote:
>When I was in school, we used PV Clay and colemanite and
>nothing else to make a clear glaze.
This extraordinarily simple glaze is what finally delivered the crackle that
I was looking for when we were doing raku. Throw in a little tin for
opacity. A 70/30 GB/PV mix melts well at ^06 and gives big, well defined
crackle patterns. Love it.
Bruce Girrell
hmmmmm... kinda makes me want to go smoke some pots
Ilene Mahler on fri 4 mar 05
are you comming and bringing mugs..Ilene..I want some
----- Original Message -----
From:
To:
Sent: Thursday, March 03, 2005 8:56 PM
Subject: Re: Plastic Vitrox
> Ive been using PV 50% Ash 50 % with 2 % cobalt carb and also 50 % PV and
ash
> 50 % with 3 % copper carb,, yummy,,,
>
> i love simple glazes ,, and of course 50 ash 50 red art
>
> KISS,, keep it simple stupid..
>
> Kissed on Lookout Mountain
>
> Mark
>
>
____________________________________________________________________________
__
> 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.
Mud Duck Pottery on sun 26 mar 06
What is plastic vitrox????
I have a glaze that I would like to try but I can't seem to find out what
plastic vitrox is or where to get it.
I looked in the Hammer pottery dictionary but they didn't have plastic
vitrox listed.
Checked Axner and Bailey catalog and not listed there either.
So what is this mysterious material??
Haven't googled it yet but I'll give that a try.
Gene & Latonna
mudduck@mudduckpottery.net
www.mudduckpottery.net
Dave Finkelnburg on sun 26 mar 06
Gene and Latonna,
Plastic vitrox is sometimes called PVC, or PV
Clay, or plastic vitrox clay. It is a "plastic"
feldspar-like material. It's available from Laguna,
don't know about other sources.
Regards,
Dave Finkelnburg
--- Mud Duck Pottery wrote:
> What is plastic vitrox????
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
Hank Murrow on sun 26 mar 06
On Mar 26, 2006, at 12:59 PM, Mud Duck Pottery wrote:
> What is plastic vitrox????
It is a Rhyolite mined near San Diego, having a mole formula of 1
alkali/alkali earth, 1 alumina, and 11 Silica. Slightly plastic. Very
clean. Good basis for a porcelain.
Cheers, Hank
www.murrow.biz/hank
Bruce Girrell on sun 26 mar 06
Last time I checked you could get it from Laguna.
Is it a raku glaze?
70/30 PV/GB gave me the crackle pattern that I had wanted for years.
Bruce Girrell
Steve Slatin on sun 26 mar 06
White Burning Plastic Feldspar. Also called "PV
Clay." If you don't have any and can't readily
get it, Cornwall Stone makes a good substitute.
-- Steve Slatin
--- Mud Duck Pottery wrote:
> What is plastic vitrox????
>
> I have a glaze that I would like to try but I
> can't seem to find out what
> plastic vitrox is or where to get it.
>
> I looked in the Hammer pottery dictionary but
> they didn't have plastic
> vitrox listed.
>
> Checked Axner and Bailey catalog and not listed
> there either.
>
> So what is this mysterious material??
>
> Haven't googled it yet but I'll give that a
> try.
>
> Gene & Latonna
> mudduck@mudduckpottery.net
> www.mudduckpottery.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.
>
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
Mark Issenberg on sun 26 mar 06
I have bought PV at Highwater Clay ,, just opened a new 50 lb bag.. I use PV
and ash 50 /50 also use 3 % cobalt carb for a blue and also use 3 % copper
carb for a cool green sorta to red at cone 10 red in my Alpine.. Did a bunch
of tile and they are green and red
PV is a sorta feldspar /clay..
BUT if David F jumps in on this we will really know what PV is...
Mark
Lookout Mountain where we just got back from the Pocket to see the wild
flowers.. Lots of Blue bells , Celadine Popies , Hapatica,, and gobs more.. We go
there every other day.. new show daily
Brad hope you feel better
fran.terraforms on sun 26 mar 06
Highwater Clays has Plastic Vitrox. I have a whole series of recipes based
on one base and have always found it to be reliable.
Fran
----- Original Message -----
From: "Mud Duck Pottery"
To:
Sent: Sunday, March 26, 2006 3:59 PM
Subject: plastic vitrox
> What is plastic vitrox????
>
> I have a glaze that I would like to try but I can't seem to find out what
> plastic vitrox is or where to get it.
>
> I looked in the Hammer pottery dictionary but they didn't have plastic
> vitrox listed.
>
> Checked Axner and Bailey catalog and not listed there either.
>
> So what is this mysterious material??
>
> Haven't googled it yet but I'll give that a try.
>
> Gene & Latonna
> mudduck@mudduckpottery.net
> www.mudduckpottery.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.
Ron Roy on mon 27 mar 06
Kinda like a mixture of spar and kaolin - this is a problem for solving
with calculation - send me the recipe and I'll do some revisions for you -
just say what kinds of spar you have.
I can send an analysis if you want to do the calculations yourself - but I
think it is one of those variable materals so you need to keep that in mind
as you deal it out.
Laguna sells it I think.
RR
>What is plastic vitrox????
>
>I have a glaze that I would like to try but I can't seem to find out what
>plastic vitrox is or where to get it.
>
>I looked in the Hammer pottery dictionary but they didn't have plastic
>vitrox listed.
>
>Checked Axner and Bailey catalog and not listed there either.
>
>So what is this mysterious material??
>
>Haven't googled it yet but I'll give that a try.
>
>Gene & Latonna
>mudduck@mudduckpottery.net
>www.mudduckpottery.net
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
lela martens on mon 27 mar 06
About a year ago I bought some plastic vitrox from Plainsman.
Wish I could remember which glaze recipe called for it. I just
know it sounded very nice, or I wouldn`t have bought it.....
Lela
>From: Dave Finkelnburg
>Reply-To: Clayart
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Re: plastic vitrox
>Date: Sun, 26 Mar 2006 14:33:02 -0800
>
>Gene and Latonna,
> Plastic vitrox is sometimes called PVC, or PV
>Clay, or plastic vitrox clay. It is a "plastic"
>feldspar-like material. It's available from Laguna,
>don't know about other sources.
> Regards,
> Dave Finkelnburg
>
>--- Mud Duck Pottery wrote:
> > What is plastic vitrox????
>
>
>__________________________________________________
>Do You Yahoo!?
>Tired of spam? Yahoo! Mail has the best spam protection around
>http://mail.yahoo.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.
_________________________________________________________________
Take charge with a pop-up guard built on patented Microsoft® SmartScreen
Technology
http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=http://hotmail.com/enca&HL=Market_MSNIS_Taglines
Start enjoying all the benefits of MSN® Premium right now and get the
first two months FREE*.
Tom Buck on tue 28 mar 06
MDP:
sad news, PV is out of production, the grade became too erratic
for mining to continue.
try to find someone who has a stock on hand, or use glaze
calculation to substitute for PV with other minerals/chemicals.
how old is the recipe...if up to 10 years old, then this is the
analysis that probably will apply:
75.4 SiO2 (Silica); 14.8 Al2O3 (Alumina); 0.2 CaO; 0.2 MgO; 6.8
K2O; 0.3 Na2O and by difference, 2.3 Loss on Ignition. all amounts are in
percent by weight.
good pots. peace Tom B.
Tom Buck ) -- primary address.
"alias" or secondary address.
tel: 905-389-2339 (westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street, Hamilton ON L8T 3E1 Canada
Jon Pacini on wed 29 mar 06
Greetings All----Tom Buck wrote--sad news, PV is out of production, the
grade became too erratic
for mining to continue.
Not sure which PV mine Tom is talking about, but Laguna has a truck picking
24 tons of PV Clay up today. We pick one up every week or so--have for
years and the prospect is that we will continue to do so. The mine has not
notified us of any disruption in the supply.
As for the quality of the material-- Early last year we became aware of some
problems with boron contamination as did a number of other clay supply
companies who use the material. Fortunately because we test our raw
materials, we didn't get bit by the contamination as other did.
As with all raw materials there is some variation in the composition from
shipment to shipment and we continue to test each pallet of PV Clay we
receive.
I have heard that a number of the suppliers who got the bad PV have stopped
supplying it, but once again, I know of no disruption in the supply.
Best regards,
Jon Pacini
Clay Manager
Laguna Clay Co
David Beumee on wed 5 jan 11
Happy New Year Bill, and may it be a good one for your work.
How lucky for you that you were able to take in a Val Cushing class. Are yo=
=3D
u
an Alfred grad?
I made quite a study of talc in stoneware bodies for the purpose of seeking
the magnificent orange fired color.
I came up with one body that achieved my aim, but had 3.4% absorption at
cone 10 in reduction.
That body is:
SS1 19 Rev. #4
15 Tile #6
15 EPK
20 M&D ball clay (I would sub Kentucky Stone ball clay since M&D is no
longer available)
10 Lincoln 60 fire clay
10 50 mesh Hawthorn Bond
10 HR 100 talc
10 200 mesh silica
10 Muddox Mortar Clay (aka Newman #7)
Excellent workability
11.5% shrinkage @ cone 10 in reduction
3.4% absorption @cone 10 " "
No warping or cracking
Slight textural feel
Beautiful orange/tan fired color with iron spots
GTS 1&2 Crazed, GTS 3-10 Fit
So, excellent glaze fit with no shivering of the body, and a very beautiful
fired color, but a high absorption % at cone 10.
When I dropped the use of talc and substituted G-200 spar, I gained the
proper absorption percentage but lost the beautiful fired color. That body
is:
SS1 19 Rev.#8
15 Tile #6
15 EPK
20 Kentucky Stone ball clay
8 Lincoln 60 fire clay
20 50 mesh Hawthorn Bond
12 G-200
12 200 mesh silica
10 Muddox Mortar Clay/Newman #7
Excellent workability
16.5% shrinkage @ cone 10
1.2% absorption @ cone 10
No warping or cracking
Slight textural feel
Tan brown fired color with iron spots
GTS #1 Crazed, GTS 2-10 Fit
So, from what you are saying, I should leave 7% talc in the mixture, along
with the spar for better orange color?
Or maybe just not worry about the high absorption % and go with Rev. #4?
In any case, we've both proven that talc can be used successfully as a high
temperature stoneware flux without any dunting or shivering of the body.
It's amazing to hear that you still have Pine Lake to use. Uncle Don uses
the Salt Lake source for A.P. Green. Is that where you get yours? It had
such a great orange fired color, good plasticity, low absorption, and
absolutely no warping or cracking, a beautiful fired test bar. I'm making a
great terra sig with my little stash.
I will look for Hectalite and give it a go. Thanks for the tip.
Best to you,
David
On Mon, Jan 3, 2011 at 2:21 PM, Bill Merrill wrote:
> David,
>
>
>
> I have not used PV Clay for many many years, but it may help with making =
=3D
a
> porcelain body have better strength and could therefore make the body sta=
=3D
nd
> up better. As you agreed with me=3D85TEST IT if it may help a body that =
do=3D
esn=3D92t
> seem quite right. Maybe that is why it is called Plastic Vitrox, becaus=
=3D
e
> it is slightly plastic. A material Jim use from Seattle Pottery Supply u=
=3D
ses
> for plasticity in many of his porcelain clay is *Hectalite *, a vgee gum
> like material.
>
>
>
> If you try it for any reason let me know.
>
>
>
> Ron Roy keeps telling me that talc is no good for a stoneware body as a
> flux. I have used my body since =3D9268 and not one pot has broken from =
du=3D
nting
> or has it caused shivering. If you make your own clay, try 7 % talc in a
> test. If your body has iron the body will be more orange in color. I ha=
=3D
ve
> 9 ingrediants in my body and I am still using A.P.Green and Pine Lake
> fireclay in My body. I still have a good stock of it. . The use of tal=
=3D
c
> was encouraged to me in Val Cushings class many years ago.
>
>
>
> Bill
>
>
>
>
>
> *From:* David Beumee [mailto:dtbeumee@wildblue.net]
> *Sent:* Monday, January 03, 2011 1:04 PM
> *To:* Bill Merrill
> *Cc:* Clayart@lsv.ceramics.org
> *Subject:* Re: Plastric Vitrox
>
>
>
> Bill's right. Always do a comparison fusion button test in your own kiln
> under your own firing conditions before making a substitution. In my kiln=
=3D
at
> cone 10 in reduction plastic vitrox is a much stiffer melt than Cornwall
> Stone, so it would not work to make a straight across sub. Also, PV clay =
=3D
is
> an astonishingly short material. I can't how it could possibly add any
> plasticity to a porcelain body.
>
> David Beumee
> Lafayette, CO
>
>
>
>
>
>
>
>
>
>
>
>
> On Sun, Jan 2, 2011 at 2:34 PM, Bill Merrill wrote:
>
> K2O/Na2O/CaO=3DD7Al2O3=3DD710SiO2-a plastic high-potash feldspathic clay,=
sim=3D
ilar
> in structure to Cornwall stone-used in place of potash feldspar in some
> porcelain bodies to increase plasticity..
>
> Richard Willis
>
>
> A California feldspathic earth, usually packaged under the label PVC for
> "Plastic Vitrox Clay", that is similar in makeup to Cornwall Stone but fi=
=3D
res
> whiter. It is preferred by many for use in white clay or glaze formulas
> where kaolin or a "white clay" is called for.
> Typical empirical analyses are SiO2 75.56%, Al2O3 14.87%, Fe2O3 0.09%, Ca=
=3D
O
> 0.22%, MgO 0.20%, Na2O 0.29%, K2O 6.81% and CaO 1.00%, K2O 5.00%, MgO 0.5=
=3D
0%,
> Na2O 0.90%, TiO2 0.10%, Al2
> >O3 12.70%, SiO2 76.50%, Fe2O3 0.50%
>
> Plastic Vitrox may be purchased at Seattle Pottery Supply. 1-800-522-197=
=3D
5
>
> Don't discount anything you are told about many ceramic materials until y=
=3D
ou
> have tried the material yourself. It is easy to do a fusion button to se=
=3D
e
> what the melt is by its self. Why run after an illusive rabbit if you do=
=3D
n't
> have to. It is always better to do a test of materials your self and you
> will see if whatever you are testing works or deosn't work. Doing a sim=
=3D
ple
> test does not cost much except for a few minutes invested to find our for
> your self.
>
> I traded Dave Shaner one of my glazes and it did not work for him. I was
> just reading that postcard and he said, the materials, firing, claybody
> probably wasn't the same as what I had...
>
> Bill
>
>
>
>
>
>
>
>
>
>
>
>
| |
|
