Jim Murphy on mon 4 aug 03
Tony,
Thanks for the reply.
I actually have the software program, "Insight", from Digitalfire.
From what I've read about vitrified clay pipe and Chemical Stoneware though,
there's apparently something special about the "mineralology" of some of the
clay body recipe materials used which accounts for the fired product's
resistance to weather extremes, chemical attack, etc.
I'm not sure if it's the use of certain Red clays or stoneware clays. Not
sure what's used to flux these bodies either ( Talc, Wollastonite, Neph Sy
?).
I've got some recipes for Terracotta bodies, but, it's the "something else"
used in vitrified clay pipe and Chemical Stoneware bodies that I'm not sure
about.
Best wishes,
Jim Murphy
on 8/4/03 6:21 PM, Tony Ferguson at fergy@CPINTERNET.COM wrote:
> Jim,
>
> Since you have the chem break down why not go to http://www.digitalfire.com
> and start with a basic stoneware body and tweak it until you get your
> breakdown?
Jim Murphy on mon 4 aug 03
Anybody have any ideas/suggestions for a Chemical Stoneware or Vitrified
Clay Pipe Body recipe ?
In searching the Web, I found some general information:
Chemical Stoneware is a term that has come to denote a body of higher
vitrification and more dimensional uniformity than regular vitrified clay
pipe (sewer pipe). Pipe made of this type of body is usually stronger than
vitrified clay pipe with somewhat better chemical resistance. Chemical
Stoneware is usually fired to temperatures of 2100 F (1150 C) and above and
is more completely vitrified than regular clay pipe. I think vitrified clay
pipe is usually fired in the 2000 F (1100 C) range.
I also found the following Typical Composition of Chemical Stoneware:
SiO2 71.20
Al2O3 23.10
Fe2O3 0.58
TiO2 0.90
Na2O 0.28
K2O 1.96
CaO 0.40
MgO 1.13
I believe Chemical Stoneware, like vitrified clay pipe, is usually
manufactured by an extrusion process.
I've also read that vitrified clay pipe may include Shale and/or the mineral
Illite in its body. Maybe Chemical Stoneware also has Shale and/or Illite ?
Perhaps someone may point me in the direction of an Illite-rich Clay or
suitable "filler" material.
I'd appreciate any info.
TIA,
Jim Murphy
Tony Ferguson on mon 4 aug 03
Jim,
Since you have the chem break down why not go to http://www.digitalfire.com
and start with a basic stoneware body and tweak it until you get your
breakdown? The only pipe I strung (that's construction talk for lay'in pipe
which is construction talk for putting the pipe in the ground and connecting
it) was extruted earthenware. When I worked sewer and water construction,
some districts likes using the earthenware pipe because of its properties as
equated to the Roman's success with earthenware pipe--that it lasts forever.
AND I wonder about its filtering properties as well. This reminds me of a
teapot from Spain made of their earthen ware that was unglazed and would
filter out the tannins from tea. I made one for a friend and he said it
worked just great like the one from Spain.
Thank you.
Tony Ferguson
On Lake Superior, where the sky meets the Lake
Stoneware, Porcelain, Raku and more
by Coleman, Ferguson, Winchester...
www.aquariusartgallery.com
218-727-6339
315 N. Lake Ave
Apt 312
Duluth, MN 55806
----- Original Message -----
From: "Jim Murphy"
To:
Sent: Monday, August 04, 2003 5:19 PM
Subject: Chemical Stoneware & Vitrified Clay Pipe
> Anybody have any ideas/suggestions for a Chemical Stoneware or Vitrified
> Clay Pipe Body recipe ?
>
> In searching the Web, I found some general information:
>
> Chemical Stoneware is a term that has come to denote a body of higher
> vitrification and more dimensional uniformity than regular vitrified clay
> pipe (sewer pipe). Pipe made of this type of body is usually stronger than
> vitrified clay pipe with somewhat better chemical resistance. Chemical
> Stoneware is usually fired to temperatures of 2100 F (1150 C) and above
and
> is more completely vitrified than regular clay pipe. I think vitrified
clay
> pipe is usually fired in the 2000 F (1100 C) range.
>
> I also found the following Typical Composition of Chemical Stoneware:
>
> SiO2 71.20
> Al2O3 23.10
> Fe2O3 0.58
> TiO2 0.90
> Na2O 0.28
> K2O 1.96
> CaO 0.40
> MgO 1.13
>
> I believe Chemical Stoneware, like vitrified clay pipe, is usually
> manufactured by an extrusion process.
>
> I've also read that vitrified clay pipe may include Shale and/or the
mineral
> Illite in its body. Maybe Chemical Stoneware also has Shale and/or Illite
?
> Perhaps someone may point me in the direction of an Illite-rich Clay or
> suitable "filler" material.
>
> I'd appreciate any info.
>
> TIA,
>
> Jim Murphy
>
>
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melpots@pclink.com.
>
John K Dellow on wed 6 aug 03
>
>
>I've got some recipes for Terracotta bodies, but, it's the "something else"
>used in vitrified clay pipe and Chemical Stoneware bodies that I'm not sure
>about.
>
>
>
As far as I know terracotta pipe is a terracotta body taken to its soffining
point and then salted ( as in salt glaze).
John Dellow "the flower pot man"
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
Jim Murphy on wed 6 aug 03
Hi John,
I've heard industry, for the most part, has gotten away from salt-glazing
sewer pipe (vitrified clay pipe) since the salt glaze "crazes". Then, when
attacked by acids, the pipe's durability and strength are jeopardized.
I read - for glazed pipe - industry may rely more on Boron-based glazes.
I'm interested now though, in "UNglazed" clay bodies of chemical stoneware -
sometimes called chemical porcelain - and vitrified clay pipe (VCP).
Like unglazed terracotta bodies, they are suitable for outdoor use, weather
extremes, etc.
What's more - these unglazed chemical stoneware and VCP bodies also have the
unique characteristic of being resistant to attack from chemical, acids,
etc. They don't need a glaze to provide this added protection.
I've read that these unglazed bodies may consist, in part, of Illite-rich
and/or Shale clays.
I believe many - if not most - terracotta bodies rely on Talc as the sole
body flux material.
I'm not sure whether unglazed chemical stoneware and VCP bodies rely on Talc
also or if they use some other body flux material like Neph Sy or
Wollastonite.
I'm not so sure that Talc, alone, would be responsible for the resistance to
chemical attack - even in a Talc-based body fired to its softening point.
"It" must be something else ???????
Best wishes to all,
Jim Murphy - whose latest clay adventure is searching for "it"
on 8/6/03 1:16 AM, John K Dellow at dellowjk@OPTUSNET.COM.AU wrote:
> As far as I know terracotta pipe is a terracotta body taken to its soffining
> point and then salted ( as in salt glaze).
Logan Oplinger on fri 8 aug 03
On Mon, 4 Aug 2003 17:19:11 -0500, Jim Murphy wrote:
>Anybody have any ideas/suggestions for a Chemical Stoneware or Vitrified
>Clay Pipe Body recipe ?
Hello Jim,
I don't have a handy formula fore chemical stoneware, but if you have
access to a library that has the following reference, it has recipes for
various clay bodies, including chemical stoneware.
The Chemical Formulary, by Bennett, Harry (Editor).
If I have time later, I will post what I can find to you directly.
Logan Oplinger
Another Pacific Island
13.28 N, 144.45 E.
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