Autumn Downey on wed 27 nov 02
This is an offshoot of Ron Roy and Tony Hansen glazes. I'm not sure it works on real porcelain, but it seems ok on Plainsman M370 (old batch). However, finding new names for clear glazes is getting difficult, so this describes it's lineage to me at least!
Have only had a 1000g test batch made up so far, so it hasn't been tested extensively. And we fire to cone 5, so it could be different at 6, too. Anyway, people using underglaze reds could see if the colours hang in for them.
Porcelain clear3
================
SILICA.............. 24.00 24.00%
EPK KAOLIN.......... 21.00 21.00%
WOLLASTONITE........ 23.00 23.00%
FRIT 3195........... 28.00 28.00%
TALC................ 2.00 2.00%
SPODUMENE........... 2.00 2.00%
========
100.00
CaO 0.83* 14.53%
Li2O 0.02* 0.16%
MgO 0.06* 0.79%
K2O 0.00* 0.08%
Na2O 0.09* 1.75%
TiO2 0.00 0.10%
Al2O3 0.39 12.52%
B2O3 0.30 6.63%
P2O5 0.00 0.06%
SiO2 3.35 63.07%
Fe2O3 0.01 0.30%
MnO 0.00* 0.03%
Cost/kg 2.60
Si:Al 8.55
SiB:Al 9.32
Expan 6.14
Notes:
An attempt to get a porcelain clear with enough Ca.
Autumn Downey
Yellowknife Guild of Arts and Crafts website:
http://users.internorth.com/~downeya/index.html
Ron Roy on sun 1 dec 02
Hi Autumn,
Excuse me for butting in - again - but -
This porcelain clear has a very low expansion - it could result in glaze
dunting on some clay bodies - it would be best to test it well before
commiting it to use.
I have raised the expansion quite a bit in this revision.
Wollastonite - 23.0
Frit 3195 - 31.0
G200 spar - 19.0 (Can use Custer)
Epk - 12.0
Silica - 15.0
Total - 100.0
Let us know if it melts properly at cone 5 - it should be OK at cone 6 as well.
RR
>This is an offshoot of Ron Roy and Tony Hansen glazes. I'm not sure it
>works on real porcelain, but it seems ok on Plainsman M370 (old batch).
>However, finding new names for clear glazes is getting difficult, so this
>describes it's lineage to me at least!
>
>Have only had a 1000g test batch made up so far, so it hasn't been tested
>extensively. And we fire to cone 5, so it could be different at 6, too.
>Anyway, people using underglaze reds could see if the colours hang in for
>them.
>
> Porcelain clear3
> ================
> SILICA.............. 24.00 24.00%
> EPK KAOLIN.......... 21.00 21.00%
> WOLLASTONITE........ 23.00 23.00%
> FRIT 3195........... 28.00 28.00%
> TALC................ 2.00 2.00%
> SPODUMENE........... 2.00 2.00%
> ========
> 100.00
>
> CaO 0.83* 14.53%
> Li2O 0.02* 0.16%
> MgO 0.06* 0.79%
> K2O 0.00* 0.08%
> Na2O 0.09* 1.75%
> TiO2 0.00 0.10%
> Al2O3 0.39 12.52%
> B2O3 0.30 6.63%
> P2O5 0.00 0.06%
> SiO2 3.35 63.07%
> Fe2O3 0.01 0.30%
> MnO 0.00* 0.03%
>
> Cost/kg 2.60
> Si:Al 8.55
> SiB:Al 9.32
> Expan 6.14
>
> Notes:
> An attempt to get a porcelain clear with enough Ca.
>
>Autumn Downey
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Autumn Downey on sun 1 dec 02
Hi Ron,
You are right - it would need testing for specific claybodies. I did put it out there for people who might be lookng for very low expansion. As we had been with the M370 - most everything crazed. However, it does appear that since the claybody was revised just recently, we will be able to use regular clears again!
So, in fact we'll probably return to a clear you came up with earlier -the underglaze colours worked well with it.
Thanks,
Autumn
At 01:45 AM 2002-12-01 -0500, you wrote:
>Hi Autumn,
>
>Excuse me for butting in - again - but -
>
>This porcelain clear has a very low expansion - it could result in glaze
>dunting on some clay bodies - it would be best to test it well before
>commiting it to use.
>
>I have raised the expansion quite a bit in this revision.
>
>Wollastonite - 23.0
>Frit 3195 - 31.0
>G200 spar - 19.0 (Can use Custer)
>Epk - 12.0
>Silica - 15.0
>Total - 100.0
>
>Let us know if it melts properly at cone 5 - it should be OK at cone 6 as well.
>
>RR
>
>
>>This is an offshoot of Ron Roy and Tony Hansen glazes. I'm not sure it
>>works on real porcelain, but it seems ok on Plainsman M370 (old batch).
>>However, finding new names for clear glazes is getting difficult, so this
>>describes it's lineage to me at least!
>>
>>Have only had a 1000g test batch made up so far, so it hasn't been tested
>>extensively. And we fire to cone 5, so it could be different at 6, too.
>>Anyway, people using underglaze reds could see if the colours hang in for
>>them.
>>
>> Porcelain clear3
>> ================
>> SILICA.............. 24.00 24.00%
>> EPK KAOLIN.......... 21.00 21.00%
>> WOLLASTONITE........ 23.00 23.00%
>> FRIT 3195........... 28.00 28.00%
>> TALC................ 2.00 2.00%
>> SPODUMENE........... 2.00 2.00%
>> ========
>> 100.00
>>
>> CaO 0.83* 14.53%
>> Li2O 0.02* 0.16%
>> MgO 0.06* 0.79%
>> K2O 0.00* 0.08%
>> Na2O 0.09* 1.75%
>> TiO2 0.00 0.10%
>> Al2O3 0.39 12.52%
>> B2O3 0.30 6.63%
>> P2O5 0.00 0.06%
>> SiO2 3.35 63.07%
>> Fe2O3 0.01 0.30%
>> MnO 0.00* 0.03%
>>
>> Cost/kg 2.60
>> Si:Al 8.55
>> SiB:Al 9.32
>> Expan 6.14
>>
>> Notes:
>> An attempt to get a porcelain clear with enough Ca.
>>
>>Autumn Downey
>
>Ron Roy
>RR#4
>15084 Little Lake Road
>Brighton, Ontario
>Canada
>K0K 1H0
>Phone: 613-475-9544
>Fax: 613-475-3513
>
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>
Yellowknife Guild of Arts and Crafts website:
http://users.internorth.com/~downeya/index.html
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