gary navarre on wed 11 jan 12
Looks like I'll need to wad the pieces with sea shells=3D
Thanks Guys,=3D0A=3D0A=3DA0Looks like I'll need to wad the pieces with sea =
shells=3D
and clay wafers in case I manage to get the front past ^10 for a good leng=
=3D
th of time. I used some of the base with 1% copper carb and 3-4% titanium o=
=3D
xide in the first or second firing and I don't recall any running enough to=
=3D
stick to a shelf. Turned out a bit frosty semi-opaque=3DA0 Right up front =
at=3D
the throat arch some pots melted and a the glaze stuck on one or two but t=
=3D
hat got so hot from how it got loaded and this firing that is changed so it=
=3D
might stay cooler along the floor and hotter on top and into the middle se=
=3D
ttings.=3D0A=3D0A=3DA0Geee, if I hadn't been so dyslexic in shcllo I might =
be abl=3D
e to understand all that chemistry and math and figure this out myself. Whe=
=3D
n Bill Pitney assigned us chapter 12 in "Clay & Glazes for the Potter" I pr=
=3D
etty much zoned out. Oh well, I got other skills and if there is something =
=3D
I don't understand I can ask and most of the time get some answer I can wor=
=3D
k with so thanks and have a safe start to the New Year of the Dragon. =3D0A=
=3D
=3D0A=3DA0=3D0AGary Navarre=3D0ANavarre Pottery=3D0ANavarre Enterprises=3D0=
ANorway, Mic=3D
higan, USA=3D0Ahttp://www.NavarrePottery.etsy.com=3D0Ahttp://www.youtube.co=
m/Gi=3D
ndaUP=3D0Ahttp://public.fotki.com/GindaUP/=3D0A=3D0A=3D0A=3D0A_____________=
__________=3D
_________=3D0A From: Edouard Bastarache =3D0ATo: Clayar=
t@LS=3D
V.CERAMICS.ORG =3D0ASent: Wednesday, January 11, 2012 2:32 PM=3D0ASubject: =
Re: =3D
[Clayart] Leach Clear?=3D0A =3D0AGary,=3D0A=3D0Aaccording to Richard Zakin'=
s Descri=3D
b9,=3D0Ait is an excellent category for transparent=3D0Aglazes=3D0A=3D0AChe=
mical an=3D
alysis according to GlazeChem :=3D0A=3D0ANa2O=3DA0 0.04=3DA0 =3DA0 Al2O3=3D=
A0 0.43=3DA0 =3D
=3DA0 SiO2=3DA0 2.98=3D0AK2O=3DA0 0.04=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =
=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3D
=3DA0 =3DA0 =3DA0 =3DA0 P2O5=3DA0 0.00=3D0AMgO=3DA0 0.45=3DA0 =3DA0 =3DA0 =
=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3D
=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 TiO2=3DA0 0.01=3D0ACaO=3DA0 0.47=
=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3D
=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 Fe2O3=3DA0 0.01=
=3D0A=3D0AAlumina:Silica r=3D
atio is=3DA0 1.00:6.91=3D0ANeutral:Acid ratio is=3DA0 =3DA0 1.00:6.94=3D0AA=
lk:Neut:Ac=3D
id ratio is 1.00:0.43:2.99=3D0A=3D0AExpansion: 57.8 x 10e-7 per degree C=3D=
0A=3D0AG=3D
is,=3D0A=3D0AEdouard Bastarache=3D0ASpertesperantisto=3D0A=3D0ASorel-Tracy=
=3D0AQuebec=3D
=3D0A=3D0Ahttp://www.flickr.com/photos/30058682@N00/=3D0Ahttp://edouardbast=
arache=3D
.blogspot.com/=3D0Ahttp://smart2000.pagesperso-orange.fr/bloggs_edouard.htm=
=3D
=3D0Ahttp://www.facebook.com/edouard.bastarache
gary navarre on wed 11 jan 12
I mixed a clear base from the Leach family of glazes I m=3D
Hey Folks,=3D0A=3D0A=3DA0I mixed a clear base from the Leach family of glaz=
es I m=3D
ight have gotten from one of Simon's videos when he was going for Celadon a=
=3D
nd a note says 1270C or between ^8 & ^9.=3D0A=3D0AEPK=3DA0=3DA0=3DA0=3DA0=
=3DA0=3DA0=3DA0=3DA0=3D
=3DA0 25%=3D0ACornwall=3DA0=3DA0=3DA0 25% (I have the old stuff)=3D0A=3D0AL=
imestone=3DA0 25=3D
%=3D0AFlint=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0 25%=3D0A=3D0A=
This is just about the rec=3D
ipe for the Rhodes porcelain I mixed a long time ago, 'member it was flabby=
=3D
, except it had Ball Clay instead of Limestone and I probably used Kona or =
=3D
Custer for the feldspar. Now that I see it on "paper" I see why one is a bo=
=3D
dy and one a glaze so what I'm wondering is if this glaze will withstand go=
=3D
ing a few cones hotter, maybe ^14, without sliding off the outsides of piec=
=3D
es in the front of my load. I'll be wadding them up on shells just in case =
=3D
and maybe even a clay disk since these are Porcelain and I don't want those=
=3D
hair line cracks in the foot ring I got in an earlier firing. Of course I =
=3D
could just skip glazing and see what happens to the naked Porcelain when th=
=3D
e ash from up here soaks in. =3D0A=3D0A=3D0AThanks for any suggestions and =
stay i=3D
n there eh.=3D0A=3D0A=3D0AGary Navarre=3D0ANavarre Pottery=3D0ANavarre Ente=
rprises=3D0A=3D
Norway, Michigan, USA=3D0Ahttp://www.NavarrePottery.etsy.com=3D0Ahttp://www=
.you=3D
tube.com/GindaUP=3D0Ahttp://public.fotki.com/GindaUP/=3D0A
ronroy@CA.INTER.NET on wed 11 jan 12
Hi Gary,
I've posted the Seger formula below - looks to me like a cone 10 glaze =3D2=
0
- so I am thinking you better be ready for some movement.
RR
EPK......................... 25.00
CORN STN.................... 25.00
WHITING..................... 25.00
SILICA...................... 25.00
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D
100.00
CaO 0.90*
MgO 0.01*
K2O 0.04*
Na2O 0.05*
Fe2O3 0.01
TiO2 0.00
Al2O3 0.46
SiO2 3.22
P2O5 0.00
Si:Al: 6.95
SiB:Al: 6.95
Thermal Expansion: 427.89
Formula Weight: 299.93
Quoting gary navarre :
> I mixed a clear base from the Leach family of glazes I m
> Hey Folks,
>
> =3DA0I mixed a clear base from the Leach family of glazes I might have =
=3D20
> gotten from one of Simon's videos when he was going for Celadon and =3D20
> a note says 1270C or between ^8 & ^9.
>
> EPK=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0 25%
> Cornwall=3DA0=3DA0=3DA0 25% (I have the old stuff)
>
> Limestone=3DA0 25%
> Flint=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0=3DA0 25%
>
> This is just about the recipe for the Rhodes porcelain I mixed a =3D20
> long time ago, 'member it was flabby, except it had Ball Clay =3D20
> instead of Limestone and I probably used Kona or Custer for the =3D20
> feldspar. Now that I see it on "paper" I see why one is a body and =3D20
> one a glaze so what I'm wondering is if this glaze will withstand =3D20
> going a few cones hotter, maybe ^14, without sliding off the =3D20
> outsides of pieces in the front of my load. I'll be wadding them up =3D20
> on shells just in case and maybe even a clay disk since these are =3D20
> Porcelain and I don't want those hair line cracks in the foot ring I =3D2=
0
> got in an earlier firing. Of course I could just skip glazing and =3D20
> see what happens to the naked Porcelain when the ash from up here =3D20
> soaks in.
>
>
> Thanks for any suggestions and stay in there eh.
>
>
> Gary Navarre
> Navarre Pottery
> Navarre Enterprises
> Norway, Michigan, USA
> http://www.NavarrePottery.etsy.com
> http://www.youtube.com/GindaUP
> http://public.fotki.com/GindaUP/
>
>
Edouard Bastarache on wed 11 jan 12
Gary,
according to Richard Zakin's Describ9,
it is an excellent category for transparent
glazes
Chemical analysis according to GlazeChem :
Na2O 0.04 Al2O3 0.43 SiO2 2.98
K2O 0.04 P2O5 0.00
MgO 0.45 TiO2 0.01
CaO 0.47 Fe2O3 0.01
Alumina:Silica ratio is 1.00:6.91
Neutral:Acid ratio is 1.00:6.94
Alk:Neut:Acid ratio is 1.00:0.43:2.99
Expansion: 57.8 x 10e-7 per degree C
Gis,
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.flickr.com/photos/30058682@N00/
http://edouardbastarache.blogspot.com/
http://smart2000.pagesperso-orange.fr/bloggs_edouard.htm
http://www.facebook.com/edouard.bastarache
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