Bret Hinsch on fri 24 nov 00
Here in Taiwan, South African potash feldspar is extremely popular. Unfortunately for me, most English-language glaze recipes call for North American or European feldspars.
Does anyone know which type of North American or European potash this South African feldspar is roughly equivalent to? If I knew this, it would make it much easier for me to adapt glaze recipes for local use.
Bret Hinsch
Taipei, Taiwan
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June Perry on fri 24 nov 00
Bret, it would be best if you could post the formula for the spar you use.
Here on the west coast of the U.S. we have three potash feldspars available
to us, Custer, G-200, and Primas P spar. You can find information on these
empirical and/or percentages formulas of these by doing a web search on the
materials. I know that the Matrix glaze software has an on line material
database that anyone can access. They may even have your spar in there. It is
a wonderful list of raw materials.
Regards,
June
Cindy Strnad on fri 24 nov 00
Bret,
Many glaze recipes simply call for a potash or a soda spar. Often, =
either one will work. Custer and G-200 are two of the most popular North =
American potash spars. I don't know anything about your African spar, =
but I suggest you simply try substituting it into any recipe you'd like =
to test. If it gives you good results, you can go from there. If not, go =
on to a different recipe.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
Cobus Potgieter on fri 24 nov 00
The analysis for SA Potash Feldspar (Pegmin) is:
Date: 11-24-2000
PEGMIN POTASH FELDSPAR MIX TICKET
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
=20
CaO................. 0.08
MgO................. 0.05
K2O................. 10.20
Na2O................ 3.80
Fe2O3............... 0.08
TiO2................ 0.06
P2O5................ 0.05
Al2O3............... 18.00
SiO2................ 67.30
LOI.................. 0.30
=20
=3D=3D=3D=3D=3D=3D=3D=3D
99.92
CaO 0.00 0.08%w 0.10%m
MgO 0.00 0.05%w 0.08%m
K2O 0.11 10.24%w 7.37%m
Na2O 0.06 3.81%w 4.17%m
Fe2O3 0.00 0.08%w 0.03%m
TiO2 0.00 0.06%w 0.05%m
P2O5 0.00 0.05%w 0.02%m
Al2O3 0.18 18.07%w 12.00%m
SiO2 1.12 67.56%w 76.17%m
COST/KG 0.08
Si:Al 6.35
EXPAN 8.40
Notes:
LOOSE BULK DENSITY 900 - 1150
SPECIFIC GRAVITY 2.6
HARDNESS 6
REFRACTIVE INDEX 1.53
MELTING POINT ca 1100=F8C
OIL ABSORBTION 21g/100g
PACKAGING (1) 50 Kg bags
(2) 1000 Kg bulk bags
(3) Bulk rail trucks
This is a report generated by INSIGHT 5.2b. This analysis was supplied =
to me by G & W Base Minerals in South Africa, who is the major =
distributor of ceramic raw materials.
I did not do a comparative analysis search in INSIGHT for "foreign" =
feldspars, since they are numerous, and compositions vary. You will =
have to compare with feldspars that are available to you.
Regards,
Cobus Potgieter.
http://www.orusovo.com/namceram
namceram@orusovo.com
----- Original Message -----=20
From: Bret Hinsch=20
To: CLAYART@LSV.CERAMICS.ORG=20
Sent: Friday, November 24, 2000 2:48 PM
Subject: South African feldspar
Here in Taiwan, South African potash feldspar is extremely popular. =
Unfortunately for me, most English-language glaze recipes call for North =
American or European feldspars.
Does anyone know which type of North American or European potash this =
South African feldspar is roughly equivalent to? If I knew this, it =
would make it much easier for me to adapt glaze recipes for local use. =
Bret Hinsch
Taipei, Taiwan=20
-------------------------------------------------------------------------=
-----
Get more from the Web. FREE MSN Explorer download : =
http://explorer.msn.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.=20
Ababi Sharon on fri 24 nov 00
Hello Bret!
In ceramics, we have flux, and "others".
In America they have 100 ball clays, 10 potash felspars, 100 frits.
This is the rull.we, are the others, for good and bad,
Conclution!(mine)
1)A good ceramic software. I use Insight.
2) Compromise, I did it before having Insight. I do it know,acording to the
fact that my good supplier, does not always know the analysis of the
materials he sells me,for instacne, I have Italian soda feldspar, I consider
it as one of the American soda feldspars.
Or When I know the ananlysis and it calls for particular ball clay, and I
have mine, it works.The most important thinAbabi Sharon
g, to buy the raw minerals, as much as possible, from one supplier, assuming
that he gets them from the same mine.
Ababi Sharon
ababisharon@hotmail.com
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/index.html
* * * * * * * *
www.photoisland.com
ID: sharon@shoval.org.il
Password:clay
June Perry on fri 24 nov 00
You shouldn't have any problem subbing your South African spar for Custer or
G-200.
Regards,
June
Ron Roy on fri 24 nov 00
All we need to answer the question is the analysis for the SA feldspare.
RR
>Does anyone know which type of North American or European potash this
>South African feldspar is roughly equivalent to? If I knew
>this, it would make it much easier for me to adapt glaze recipes for local
>use.
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Timakia@AOL.COM on fri 24 nov 00
Brett, one of my questions about two years ago was how do I convert my South
African recipes with SA raw materials to chemicals in the USA. I found that
custer and g 200 was the best substitutes and I was able to use all my SA
recipes that contained potash feldsar. So go ahead and test recipes that
contain one of those two American feldspars and you will not have a problem.
Soda spar is a different one that I did not try jet , but I do not think it
should be too difficult to find a subsitute.
Good day.
Antoinette.
Antoinette Badenhorst
PO Box 552
Saltillo,MS
38866
http://hometown.aol.com/timakia
Frank Gaydos on sat 25 nov 00
Subject: Re: South African feldspar
When a glaze calls for Custer Spar then I use our Potash spar.
It is not an exact match but close enough that it does not give me
any probs
Toni in Durban South Africa
----- Original Message -----
Does anyone know which type of North American or European potash this South
African feldspar is roughly equivalent to? If I knew this, it would make
it much easier for me to adapt glaze recipes for local use.
Bret Hinsch
Taipei, Taiwan
Bret Hinsch on mon 27 nov 00
Dear Cobus,
Thanks so much for the feldspar analysis. People here in Taiwan tend to be
very empirical rather than analytical, so it's hard to get precise formulas
for my materials. This will be very useful.
Bret
>From: Cobus Potgieter
>Reply-To: Ceramic Arts Discussion List
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Re: South African feldspar
>Date: Fri, 24 Nov 2000 20:15:32 +0200
>
>The analysis for SA Potash Feldspar (Pegmin) is:
>
>Date: 11-24-2000
>PEGMIN POTASH FELDSPAR MIX TICKET
>=================================
>
> CaO................. 0.08
> MgO................. 0.05
> K2O................. 10.20
> Na2O................ 3.80
> Fe2O3............... 0.08
> TiO2................ 0.06
> P2O5................ 0.05
> Al2O3............... 18.00
> SiO2................ 67.30
> LOI.................. 0.30
>
> ========
> 99.92
>
> CaO 0.00 0.08%w 0.10%m
> MgO 0.00 0.05%w 0.08%m
> K2O 0.11 10.24%w 7.37%m
> Na2O 0.06 3.81%w 4.17%m
> Fe2O3 0.00 0.08%w 0.03%m
> TiO2 0.00 0.06%w 0.05%m
> P2O5 0.00 0.05%w 0.02%m
> Al2O3 0.18 18.07%w 12.00%m
> SiO2 1.12 67.56%w 76.17%m
>
> COST/KG 0.08
> Si:Al 6.35
> EXPAN 8.40
>
>Notes:
>LOOSE BULK DENSITY 900 - 1150
>SPECIFIC GRAVITY 2.6
>HARDNESS 6
>REFRACTIVE INDEX 1.53
>MELTING POINT ca 1100øC
>OIL ABSORBTION 21g/100g
>PACKAGING (1) 50 Kg bags
> (2) 1000 Kg bulk bags
> (3) Bulk rail trucks
>
>This is a report generated by INSIGHT 5.2b. This analysis was supplied to
>me by G & W Base Minerals in South Africa, who is the major distributor of
>ceramic raw materials.
>I did not do a comparative analysis search in INSIGHT for "foreign"
>feldspars, since they are numerous, and compositions vary. You will have
>to compare with feldspars that are available to you.
>
>Regards,
>Cobus Potgieter.
>
>http://www.orusovo.com/namceram
>namceram@orusovo.com
>
>
> ----- Original Message -----
> From: Bret Hinsch
> To: CLAYART@LSV.CERAMICS.ORG
> Sent: Friday, November 24, 2000 2:48 PM
> Subject: South African feldspar
>
>
> Here in Taiwan, South African potash feldspar is extremely popular.
>Unfortunately for me, most English-language glaze recipes call for North
>American or European feldspars.
>
> Does anyone know which type of North American or European potash this
>South African feldspar is roughly equivalent to? If I knew this, it would
>make it much easier for me to adapt glaze recipes for local use.
>
> Bret Hinsch
> Taipei, Taiwan
>
>
>------------------------------------------------------------------------------
> Get more from the Web. FREE MSN Explorer download :
>http://explorer.msn.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.
>
>______________________________________________________________________________
>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.
_____________________________________________________________________________________
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Cobus Potgieter on tue 28 nov 00
Let me know if you need other South African/Namibian raw materials specs. I
have a few.
Cobus.
----- Original Message -----
From: "Bret Hinsch"
To:
Sent: Tuesday, November 28, 2000 4:44 AM
Subject: Re: South African feldspar
Dear Cobus,
Thanks so much for the feldspar analysis. People here in Taiwan tend to be
very empirical rather than analytical, so it's hard to get precise formulas
for my materials. This will be very useful.
Bret
>From: Cobus Potgieter
>Reply-To: Ceramic Arts Discussion List
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Re: South African feldspar
>Date: Fri, 24 Nov 2000 20:15:32 +0200
>
>The analysis for SA Potash Feldspar (Pegmin) is:
>
>Date: 11-24-2000
>PEGMIN POTASH FELDSPAR MIX TICKET
>=================================
>
> CaO................. 0.08
> MgO................. 0.05
> K2O................. 10.20
> Na2O................ 3.80
> Fe2O3............... 0.08
> TiO2................ 0.06
> P2O5................ 0.05
> Al2O3............... 18.00
> SiO2................ 67.30
> LOI.................. 0.30
>
> ========
> 99.92
>
> CaO 0.00 0.08%w 0.10%m
> MgO 0.00 0.05%w 0.08%m
> K2O 0.11 10.24%w 7.37%m
> Na2O 0.06 3.81%w 4.17%m
> Fe2O3 0.00 0.08%w 0.03%m
> TiO2 0.00 0.06%w 0.05%m
> P2O5 0.00 0.05%w 0.02%m
> Al2O3 0.18 18.07%w 12.00%m
> SiO2 1.12 67.56%w 76.17%m
>
> COST/KG 0.08
> Si:Al 6.35
> EXPAN 8.40
>
>Notes:
>LOOSE BULK DENSITY 900 - 1150
>SPECIFIC GRAVITY 2.6
>HARDNESS 6
>REFRACTIVE INDEX 1.53
>MELTING POINT ca 1100øC
>OIL ABSORBTION 21g/100g
>PACKAGING (1) 50 Kg bags
> (2) 1000 Kg bulk bags
> (3) Bulk rail trucks
>
>This is a report generated by INSIGHT 5.2b. This analysis was supplied to
>me by G & W Base Minerals in South Africa, who is the major distributor of
>ceramic raw materials.
>I did not do a comparative analysis search in INSIGHT for "foreign"
>feldspars, since they are numerous, and compositions vary. You will have
>to compare with feldspars that are available to you.
>
>Regards,
>Cobus Potgieter.
>
>http://www.orusovo.com/namceram
>namceram@orusovo.com
>
>
> ----- Original Message -----
> From: Bret Hinsch
> To: CLAYART@LSV.CERAMICS.ORG
> Sent: Friday, November 24, 2000 2:48 PM
> Subject: South African feldspar
>
>
> Here in Taiwan, South African potash feldspar is extremely popular.
>Unfortunately for me, most English-language glaze recipes call for North
>American or European feldspars.
>
> Does anyone know which type of North American or European potash this
>South African feldspar is roughly equivalent to? If I knew this, it would
>make it much easier for me to adapt glaze recipes for local use.
>
> Bret Hinsch
> Taipei, Taiwan
>
>
>---------------------------------------------------------------------------
---
> Get more from the Web. FREE MSN Explorer download :
>http://explorer.msn.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.
>
>___________________________________________________________________________
___
>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 more from the Web. FREE MSN Explorer download : http://explorer.msn.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.
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