Edouard Bastarache on sat 26 nov 11
My message took of before I hit the right button.
I used the analysis from Glazechem.
In Seger the difference does not appear catastrophic.
Look at the notional oxide KNaO,you have about same amount of alcalis. in
the new version you have more sodium which is more powerful than potassium
but, there is more silica but less alumina,
which are refractory. So, test,,,
Seger was a great man.
Gis,
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.flickr.com/photos/30058682@N00/
http://edouardbastarache.blogspot.com/
http://edouardbastaracheblogs2.blogspot.com/
http://www.facebook.com/edouard.bastarache
refractorey oxides usch as
----- Original Message -----
From: "Edouard Bastarache"
To: "Kanika Sircar" ;
Sent: Saturday, November 26, 2011 1:41 PM
Subject: Re: PACER MINE CUSTER FELDSPAR
> Na2O 0.29 (KNaO .97) Al2O3 1.05 SiO2 7.11
> K2O 0.68 Fe2O3 0.00
> CaO 0.03
> Alumina:Silica ratio is 1.00:6.75
> Neutral:Acid ratio is 1.00:6.75
> Alk:Neut:Acid ratio is 1.00:1.05:7.12
>
> Expansion: 81.1 x 10e-7 per degree C
>
>
>
> Na2O 0.38 (KNaO .96) Al2O3 1.15 SiO2 9.55
> K2O 0.58 Fe2O3 0.01
> CaO 0.04
> Alumina:Silica ratio is 1.00:8.32
> Neutral:Acid ratio is 1.00:8.32
> Alk:Neut:Acid ratio is 1.00:1.15:9.56
>
> Expansion: 71.4 x 10e-7 per degree C
>
>
> ----- Original Message -----
> From: "Kanika Sircar"
> To:
> Sent: Saturday, November 26, 2011 1:02 PM
> Subject: PACER MINE CUSTER FELDSPAR
>
>
> Here is the comparison between Pacer and our expectations.
>
> Look at the silica % as well.
>
> Kanika
>
>
> Typical
> Pacer Mine
> Silica (SiO2
> 68.50%
> 73.50%
> Alumina (AI203) 17.00%
> 15.00%
> Iron Oxide (Fe2o3
> 0.15%
> 0.15%
> Lime (CaO)
> 0.30%
> 0.30%
> Magnesia (MgO
> Trace
> trace
> Soda (Na2O
> 3.00%
> 3.00%
> Potash (K20)
> 10.00%
> 7.00%
>
>
>
>
> --------------------------------------------------
> From: "Paul Herman"
> Sent: Saturday, November 26, 2011 10:50 AM
> To:
> Subject: Re: Custer changed?
>
>> Greetings Ron,
>>
>> I think you may have provided an explanation as to why I am seeing
>> some changes in my stoneware body, which includes 10% Custer feldspar.
>> It seems to be not as vitreous as it should be. So yes, I am having a
>> problem like what you describe, but in a clay body, not a glaze.
>>
>> Two questions: Can you share the analysis that shows Custer being low
>> in potash?
>>
>> And, has anyone tried to talk to Pacer Minerals (Custer's owner) about
>> the problem, and if so what did they say?
>>
>> Thanks,
>>
>> Paul Herman
>>
>> Great Basin Pottery
>> Doyle, California US
>> www.greatbasinpottery.com/
>
>> On Nov 25, 2011, at 8:20 AM, Ron Roy wrote:
>>
>>> Those of you who use Custer spar - potter friend of mine who takes the
>>> time to do it right has found the last batch of Custer he bought is
>>> short of potassium.
>
Ron Roy on sat 26 nov 11
Hi Ed,
No - 3% less alkali and more alumina and silica - much depends on how
much spar is in a glaze. Lots of potters are going to notice this.
More important - those potters who fire high and are counting on a
proper amount of alkalies to stop cristobalite production in stoneware
clays are going to have problems.
Easy to correct if you have some g200 or g200HP - probably best
calculate in some cases.
RR
Quoting Edouard Bastarache :
> My message took of before I hit the right button.
> I used the analysis from Glazechem.
> In Seger the difference does not appear catastrophic.
> Look at the notional oxide KNaO,you have about same amount of alcalis. in
> the new version you have more sodium which is more powerful than potassiu=
m
> but, there is more silica but less alumina,
> which are refractory. So, test,,,
> Seger was a great man.
>
> Gis,
>
> Edouard Bastarache
> Spertesperantisto
>
> Sorel-Tracy
> Quebec
>
> http://www.flickr.com/photos/30058682@N00/
> http://edouardbastarache.blogspot.com/
> http://edouardbastaracheblogs2.blogspot.com/
> http://www.facebook.com/edouard.bastarache
>
>
>
>
>
>
>
> refractorey oxides usch as
> ----- Original Message -----
> From: "Edouard Bastarache"
> To: "Kanika Sircar" ;
> Sent: Saturday, November 26, 2011 1:41 PM
> Subject: Re: PACER MINE CUSTER FELDSPAR
>
>
>> Na2O 0.29 (KNaO .97) Al2O3 1.05 SiO2 7.11
>> K2O 0.68 Fe2O3 0.00
>> CaO 0.03
>> Alumina:Silica ratio is 1.00:6.75
>> Neutral:Acid ratio is 1.00:6.75
>> Alk:Neut:Acid ratio is 1.00:1.05:7.12
>>
>> Expansion: 81.1 x 10e-7 per degree C
>>
>>
>>
>> Na2O 0.38 (KNaO .96) Al2O3 1.15 SiO2 9.55
>> K2O 0.58 Fe2O3 0.01
>> CaO 0.04
>> Alumina:Silica ratio is 1.00:8.32
>> Neutral:Acid ratio is 1.00:8.32
>> Alk:Neut:Acid ratio is 1.00:1.15:9.56
>>
>> Expansion: 71.4 x 10e-7 per degree C
>>
>>
>> ----- Original Message -----
>> From: "Kanika Sircar"
>> To:
>> Sent: Saturday, November 26, 2011 1:02 PM
>> Subject: PACER MINE CUSTER FELDSPAR
>>
>>
>> Here is the comparison between Pacer and our expectations.
>>
>> Look at the silica % as well.
>>
>> Kanika
>>
>>
>> Typical
>> Pacer Mine
>> Silica (SiO2
>> 68.50%
>> 73.50%
>> Alumina (AI203) 17.00%
>> 15.00%
>> Iron Oxide (Fe2o3
>> 0.15%
>> 0.15%
>> Lime (CaO)
>> 0.30%
>> 0.30%
>> Magnesia (MgO
>> Trace
>> trace
>> Soda (Na2O
>> 3.00%
>> 3.00%
>> Potash (K20)
>> 10.00%
>> 7.00%
>>
>>
>>
>>
>> --------------------------------------------------
>> From: "Paul Herman"
>> Sent: Saturday, November 26, 2011 10:50 AM
>> To:
>> Subject: Re: Custer changed?
>>
>>> Greetings Ron,
>>>
>>> I think you may have provided an explanation as to why I am seeing
>>> some changes in my stoneware body, which includes 10% Custer feldspar.
>>> It seems to be not as vitreous as it should be. So yes, I am having a
>>> problem like what you describe, but in a clay body, not a glaze.
>>>
>>> Two questions: Can you share the analysis that shows Custer being low
>>> in potash?
>>>
>>> And, has anyone tried to talk to Pacer Minerals (Custer's owner) about
>>> the problem, and if so what did they say?
>>>
>>> Thanks,
>>>
>>> Paul Herman
>>>
>>> Great Basin Pottery
>>> Doyle, California US
>>> www.greatbasinpottery.com/
>>
>>> On Nov 25, 2011, at 8:20 AM, Ron Roy wrote:
>>>
>>>> Those of you who use Custer spar - potter friend of mine who takes the
>>>> time to do it right has found the last batch of Custer he bought is
>>>> short of potassium.
>>
>
Edouard Bastarache on sat 26 nov 11
Hi Ron,
I prefer to compare my materials, clays and glazes in Seger,
not % weight nor % molar. My first book, 300 pages in Seger.
Just a bad habit !!!
Hehehehe.
I used the composition supplied by Kanika Sircar in which
it is said K2O 10.00%/7.00%
Gis,
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.flickr.com/photos/30058682@N00/
http://edouardbastarache.blogspot.com/
http://edouardbastaracheblogs2.blogspot.com/
http://www.facebook.com/edouard.bastarache
----- Original Message -----
From: "Ron Roy"
To:
Sent: Saturday, November 26, 2011 4:17 PM
Subject: Re: Fw: PACER MINE CUSTER FELDSPAR
> Hi Ed,
>
> No - 3% less alkali and more alumina and silica - much depends on how
> much spar is in a glaze. Lots of potters are going to notice this.
>
> More important - those potters who fire high and are counting on a
> proper amount of alkalies to stop cristobalite production in stoneware
> clays are going to have problems.
>
> Easy to correct if you have some g200 or g200HP - probably best
> calculate in some cases.
>
> RR
>
>
> Quoting Edouard Bastarache :
>
>> My message took of before I hit the right button.
>> I used the analysis from Glazechem.
>> In Seger the difference does not appear catastrophic.
>> Look at the notional oxide KNaO,you have about same amount of alcalis. i=
n
>> the new version you have more sodium which is more powerful than
>> potassium
>> but, there is more silica but less alumina,
>> which are refractory. So, test,,,
>> Seger was a great man.
>>
>> Gis,
>>
>> Edouard Bastarache
>> Spertesperantisto
>>
>> Sorel-Tracy
>> Quebec
>>
>> http://www.flickr.com/photos/30058682@N00/
>> http://edouardbastarache.blogspot.com/
>> http://edouardbastaracheblogs2.blogspot.com/
>> http://www.facebook.com/edouard.bastarache
>>
>>
>>
>>
>>
>>
>>
>> refractorey oxides usch as
>> ----- Original Message -----
>> From: "Edouard Bastarache"
>> To: "Kanika Sircar" ;
>> Sent: Saturday, November 26, 2011 1:41 PM
>> Subject: Re: PACER MINE CUSTER FELDSPAR
>>
>>
>>> Na2O 0.29 (KNaO .97) Al2O3 1.05 SiO2 7.11
>>> K2O 0.68 Fe2O3 0.0=
0
>>> CaO 0.03
>>> Alumina:Silica ratio is 1.00:6.75
>>> Neutral:Acid ratio is 1.00:6.75
>>> Alk:Neut:Acid ratio is 1.00:1.05:7.12
>>>
>>> Expansion: 81.1 x 10e-7 per degree C
>>>
>>>
>>>
>>> Na2O 0.38 (KNaO .96) Al2O3 1.15 SiO2 9.55
>>> K2O 0.58 Fe2O3 0.01
>>> CaO 0.04
>>> Alumina:Silica ratio is 1.00:8.32
>>> Neutral:Acid ratio is 1.00:8.32
>>> Alk:Neut:Acid ratio is 1.00:1.15:9.56
>>>
>>> Expansion: 71.4 x 10e-7 per degree C
>>>
>>>
>>> ----- Original Message -----
>>> From: "Kanika Sircar"
>>> To:
>>> Sent: Saturday, November 26, 2011 1:02 PM
>>> Subject: PACER MINE CUSTER FELDSPAR
>>>
>>>
>>> Here is the comparison between Pacer and our expectations.
>>>
>>> Look at the silica % as well.
>>>
>>> Kanika
>>>
>>>
>>> Typical
>>> Pacer Mine
>>> Silica (SiO2
>>> 68.50%
>>> 73.50%
>>> Alumina (AI203) 17.00%
>>> 15.00%
>>> Iron Oxide (Fe2o3
>>> 0.15%
>>> 0.15%
>>> Lime (CaO)
>>> 0.30%
>>> 0.30%
>>> Magnesia (MgO
>>> Trace
>>> trace
>>> Soda (Na2O
>>> 3.00%
>>> 3.00%
>>> Potash (K20)
>>> 10.00%
>>> 7.00%
>>>
>>>
>>>
>>>
>>> --------------------------------------------------
>>> From: "Paul Herman"
>>> Sent: Saturday, November 26, 2011 10:50 AM
>>> To:
>>> Subject: Re: Custer changed?
>>>
>>>> Greetings Ron,
>>>>
>>>> I think you may have provided an explanation as to why I am seeing
>>>> some changes in my stoneware body, which includes 10% Custer feldspar.
>>>> It seems to be not as vitreous as it should be. So yes, I am having a
>>>> problem like what you describe, but in a clay body, not a glaze.
>>>>
>>>> Two questions: Can you share the analysis that shows Custer being low
>>>> in potash?
>>>>
>>>> And, has anyone tried to talk to Pacer Minerals (Custer's owner) about
>>>> the problem, and if so what did they say?
>>>>
>>>> Thanks,
>>>>
>>>> Paul Herman
>>>>
>>>> Great Basin Pottery
>>>> Doyle, California US
>>>> www.greatbasinpottery.com/
>>>
>>>> On Nov 25, 2011, at 8:20 AM, Ron Roy wrote:
>>>>
>>>>> Those of you who use Custer spar - potter friend of mine who takes th=
e
>>>>> time to do it right has found the last batch of Custer he bought is
>>>>> short of potassium.
>>>
>>
>
Ron Roy on sun 27 nov 11
I did not say using Seger was wrong - I was simply saying your
conclusion was erroneous.
RR
Quoting Edouard Bastarache :
> Hi Ron,
>
> I prefer to compare my materials, clays and glazes in Seger,
> not % weight nor % molar. My first book, 300 pages in Seger.
> Just a bad habit !!!
> Hehehehe.
>
> I used the composition supplied by Kanika Sircar in which
> it is said K2O 10.00%/7.00%
>
> Gis,
>
> Edouard Bastarache
> Spertesperantisto
>
> Sorel-Tracy
> Quebec
>
> http://www.flickr.com/photos/30058682@N00/
> http://edouardbastarache.blogspot.com/
> http://edouardbastaracheblogs2.blogspot.com/
> http://www.facebook.com/edouard.bastarache
>
>
>
>
>
>
>
> ----- Original Message ----- From: "Ron Roy"
> To:
> Sent: Saturday, November 26, 2011 4:17 PM
> Subject: Re: Fw: PACER MINE CUSTER FELDSPAR
>
>
>> Hi Ed,
>>
>> No - 3% less alkali and more alumina and silica - much depends on how
>> much spar is in a glaze. Lots of potters are going to notice this.
>>
>> More important - those potters who fire high and are counting on a
>> proper amount of alkalies to stop cristobalite production in stoneware
>> clays are going to have problems.
>>
>> Easy to correct if you have some g200 or g200HP - probably best
>> calculate in some cases.
>>
>> RR
>>
>>
>> Quoting Edouard Bastarache :
>>
>>> My message took of before I hit the right button.
>>> I used the analysis from Glazechem.
>>> In Seger the difference does not appear catastrophic.
>>> Look at the notional oxide KNaO,you have about same amount of alcalis. =
in
>>> the new version you have more sodium which is more powerful than potass=
ium
>>> but, there is more silica but less alumina,
>>> which are refractory. So, test,,,
>>> Seger was a great man.
>>>
>>> Gis,
>>>
>>> Edouard Bastarache
>>> Spertesperantisto
>>>
>>> Sorel-Tracy
>>> Quebec
>>>
>>> http://www.flickr.com/photos/30058682@N00/
>>> http://edouardbastarache.blogspot.com/
>>> http://edouardbastaracheblogs2.blogspot.com/
>>> http://www.facebook.com/edouard.bastarache
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> refractorey oxides usch as
>>> ----- Original Message -----
>>> From: "Edouard Bastarache"
>>> To: "Kanika Sircar" ;
>>> Sent: Saturday, November 26, 2011 1:41 PM
>>> Subject: Re: PACER MINE CUSTER FELDSPAR
>>>
>>>
>>>> Na2O 0.29 (KNaO .97) Al2O3 1.05 SiO2 7.11
>>>> K2O 0.68 Fe2O3 0.=
00
>>>> CaO 0.03
>>>> Alumina:Silica ratio is 1.00:6.75
>>>> Neutral:Acid ratio is 1.00:6.75
>>>> Alk:Neut:Acid ratio is 1.00:1.05:7.12
>>>>
>>>> Expansion: 81.1 x 10e-7 per degree C
>>>>
>>>>
>>>>
>>>> Na2O 0.38 (KNaO .96) Al2O3 1.15 SiO2 9.55
>>>> K2O 0.58 Fe2O3 0.01
>>>> CaO 0.04
>>>> Alumina:Silica ratio is 1.00:8.32
>>>> Neutral:Acid ratio is 1.00:8.32
>>>> Alk:Neut:Acid ratio is 1.00:1.15:9.56
>>>>
>>>> Expansion: 71.4 x 10e-7 per degree C
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: "Kanika Sircar"
>>>> To:
>>>> Sent: Saturday, November 26, 2011 1:02 PM
>>>> Subject: PACER MINE CUSTER FELDSPAR
>>>>
>>>>
>>>> Here is the comparison between Pacer and our expectations.
>>>>
>>>> Look at the silica % as well.
>>>>
>>>> Kanika
>>>>
>>>>
>>>> Typical
>>>> Pacer Mine
>>>> Silica (SiO2
>>>> 68.50%
>>>> 73.50%
>>>> Alumina (AI203) 17.00%
>>>> 15.00%
>>>> Iron Oxide (Fe2o3
>>>> 0.15%
>>>> 0.15%
>>>> Lime (CaO)
>>>> 0.30%
>>>> 0.30%
>>>> Magnesia (MgO
>>>> Trace
>>>> trace
>>>> Soda (Na2O
>>>> 3.00%
>>>> 3.00%
>>>> Potash (K20)
>>>> 10.00%
>>>> 7.00%
>>>>
>>>>
>>>>
>>>>
>>>> --------------------------------------------------
>>>> From: "Paul Herman"
>>>> Sent: Saturday, November 26, 2011 10:50 AM
>>>> To:
>>>> Subject: Re: Custer changed?
>>>>
>>>>> Greetings Ron,
>>>>>
>>>>> I think you may have provided an explanation as to why I am seeing
>>>>> some changes in my stoneware body, which includes 10% Custer feldspar=
.
>>>>> It seems to be not as vitreous as it should be. So yes, I am having a
>>>>> problem like what you describe, but in a clay body, not a glaze.
>>>>>
>>>>> Two questions: Can you share the analysis that shows Custer being low
>>>>> in potash?
>>>>>
>>>>> And, has anyone tried to talk to Pacer Minerals (Custer's owner) abou=
t
>>>>> the problem, and if so what did they say?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Paul Herman
>>>>>
>>>>> Great Basin Pottery
>>>>> Doyle, California US
>>>>> www.greatbasinpottery.com/
>>>>
>>>>> On Nov 25, 2011, at 8:20 AM, Ron Roy wrote:
>>>>>
>>>>>> Those of you who use Custer spar - potter friend of mine who takes t=
he
>>>>>> time to do it right has found the last batch of Custer he bought is
>>>>>> short of potassium.
>>>>
>>>
>>
>
>
>
Edouard Bastarache on sun 27 nov 11
Depends on the data used.
I used the data supplied by a fellow clayarter.
I used what I understood from her message
Gis,
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.flickr.com/photos/30058682@N00/
http://edouardbastarache.blogspot.com/
http://edouardbastaracheblogs2.blogspot.com/
http://www.facebook.com/edouard.bastarache
----- Original Message -----
From: "Ron Roy"
To:
Sent: Sunday, November 27, 2011 11:40 AM
Subject: Re: Fw: PACER MINE CUSTER FELDSPAR
>I did not say using Seger was wrong - I was simply saying your
> conclusion was erroneous.
>
> RR
>
>
> Quoting Edouard Bastarache :
>
>> Hi Ron,
>>
>> I prefer to compare my materials, clays and glazes in Seger,
>> not % weight nor % molar. My first book, 300 pages in Seger.
>> Just a bad habit !!!
>> Hehehehe.
>>
>> I used the composition supplied by Kanika Sircar in which
>> it is said K2O 10.00%/7.00%
>>
>> Gis,
>>
>> Edouard Bastarache
>> Spertesperantisto
>>
>> Sorel-Tracy
>> Quebec
>>
>> http://www.flickr.com/photos/30058682@N00/
>> http://edouardbastarache.blogspot.com/
>> http://edouardbastaracheblogs2.blogspot.com/
>> http://www.facebook.com/edouard.bastarache
>>
>>
>>
>>
>>
>>
>>
>> ----- Original Message ----- From: "Ron Roy"
>> To:
>> Sent: Saturday, November 26, 2011 4:17 PM
>> Subject: Re: Fw: PACER MINE CUSTER FELDSPAR
>>
>>
>>> Hi Ed,
>>>
>>> No - 3% less alkali and more alumina and silica - much depends on how
>>> much spar is in a glaze. Lots of potters are going to notice this.
>>>
>>> More important - those potters who fire high and are counting on a
>>> proper amount of alkalies to stop cristobalite production in stoneware
>>> clays are going to have problems.
>>>
>>> Easy to correct if you have some g200 or g200HP - probably best
>>> calculate in some cases.
>>>
>>> RR
>>>
>>>
>>> Quoting Edouard Bastarache :
>>>
>>>> My message took of before I hit the right button.
>>>> I used the analysis from Glazechem.
>>>> In Seger the difference does not appear catastrophic.
>>>> Look at the notional oxide KNaO,you have about same amount of alcalis.
>>>> in
>>>> the new version you have more sodium which is more powerful than
>>>> potassium
>>>> but, there is more silica but less alumina,
>>>> which are refractory. So, test,,,
>>>> Seger was a great man.
>>>>
>>>> Gis,
>>>>
>>>> Edouard Bastarache
>>>> Spertesperantisto
>>>>
>>>> Sorel-Tracy
>>>> Quebec
>>>>
>>>> http://www.flickr.com/photos/30058682@N00/
>>>> http://edouardbastarache.blogspot.com/
>>>> http://edouardbastaracheblogs2.blogspot.com/
>>>> http://www.facebook.com/edouard.bastarache
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> refractorey oxides usch as
>>>> ----- Original Message -----
>>>> From: "Edouard Bastarache"
>>>> To: "Kanika Sircar" ; >
>>>> Sent: Saturday, November 26, 2011 1:41 PM
>>>> Subject: Re: PACER MINE CUSTER FELDSPAR
>>>>
>>>>
>>>>> Na2O 0.29 (KNaO .97) Al2O3 1.05 SiO2 7.11
>>>>> K2O 0.68 Fe2O3
>>>>> 0.00
>>>>> CaO 0.03
>>>>> Alumina:Silica ratio is 1.00:6.75
>>>>> Neutral:Acid ratio is 1.00:6.75
>>>>> Alk:Neut:Acid ratio is 1.00:1.05:7.12
>>>>>
>>>>> Expansion: 81.1 x 10e-7 per degree C
>>>>>
>>>>>
>>>>>
>>>>> Na2O 0.38 (KNaO .96) Al2O3 1.15 SiO2 9.55
>>>>> K2O 0.58 Fe2O3 0.01
>>>>> CaO 0.04
>>>>> Alumina:Silica ratio is 1.00:8.32
>>>>> Neutral:Acid ratio is 1.00:8.32
>>>>> Alk:Neut:Acid ratio is 1.00:1.15:9.56
>>>>>
>>>>> Expansion: 71.4 x 10e-7 per degree C
>>>>>
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "Kanika Sircar"
>>>>> To:
>>>>> Sent: Saturday, November 26, 2011 1:02 PM
>>>>> Subject: PACER MINE CUSTER FELDSPAR
>>>>>
>>>>>
>>>>> Here is the comparison between Pacer and our expectations.
>>>>>
>>>>> Look at the silica % as well.
>>>>>
>>>>> Kanika
>>>>>
>>>>>
>>>>> Typical
>>>>> Pacer Mine
>>>>> Silica (SiO2
>>>>> 68.50%
>>>>> 73.50%
>>>>> Alumina (AI203) 17.00%
>>>>> 15.00%
>>>>> Iron Oxide (Fe2o3
>>>>> 0.15%
>>>>> 0.15%
>>>>> Lime (CaO)
>>>>> 0.30%
>>>>> 0.30%
>>>>> Magnesia (MgO
>>>>> Trace
>>>>> trace
>>>>> Soda (Na2O
>>>>> 3.00%
>>>>> 3.00%
>>>>> Potash (K20)
>>>>> 10.00%
>>>>> 7.00%
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --------------------------------------------------
>>>>> From: "Paul Herman"
>>>>> Sent: Saturday, November 26, 2011 10:50 AM
>>>>> To:
>>>>> Subject: Re: Custer changed?
>>>>>
>>>>>> Greetings Ron,
>>>>>>
>>>>>> I think you may have provided an explanation as to why I am seeing
>>>>>> some changes in my stoneware body, which includes 10% Custer
>>>>>> feldspar.
>>>>>> It seems to be not as vitreous as it should be. So yes, I am having =
a
>>>>>> problem like what you describe, but in a clay body, not a glaze.
>>>>>>
>>>>>> Two questions: Can you share the analysis that shows Custer being lo=
w
>>>>>> in potash?
>>>>>>
>>>>>> And, has anyone tried to talk to Pacer Minerals (Custer's owner)
>>>>>> about
>>>>>> the problem, and if so what did they say?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Paul Herman
>>>>>>
>>>>>> Great Basin Pottery
>>>>>> Doyle, California US
>>>>>> www.greatbasinpottery.com/
>>>>>
>>>>>> On Nov 25, 2011, at 8:20 AM, Ron Roy wrote:
>>>>>>
>>>>>>> Those of you who use Custer spar - potter friend of mine who takes
>>>>>>> the
>>>>>>> time to do it right has found the last batch of Custer he bought is
>>>>>>> short of potassium.
>>>>>
>>>>
>>>
>>
>>
>>
>
| |
|
