Angela Davis on fri 6 jul 07
Thank you Ron, guess you can tell that was my first attempt
at adjustment. I read on Clayart all the time about working
with the formula for adjusting glazes and am trying to figure out how it
works.
I can see I need to study the chemical analysis of the materials
a lot more.
I will try your revision, and will soon have some 3124 to test
the original version too.
Angela Davis
In hot Homosassa with thunderclouds building.
----- Original Message -----
From: "Ron Roy"
To:
Sent: Thursday, July 05, 2007 7:26 PM
Subject: Re: Am I on the right Glaze adjustment track? Ron or John
> Hi Angela,
>
> You need to match up the fluxes and boron first - then adjust the alumina
> and silica. Adjust the frit first to get the same amount of boron as in
> the
> original. I added a bit more to help the melt because there is only 19%
> frit in the revision compared to 31% in the original.
>
> Here is what is should look like - a lot of clay though so maybe adding
> some alumina will help but it is hard to melt. It would be better to
> calcine some of the clay to cut down on shrinkage if it's a problem.
>
> Wollastonite........ 24.50
> EPK................. 39.50
> SILICA.............. 17.00
> F3134............... 19.00
> ----------
> 100.00
> FORMULA & ANALYSIS
> ------------------
> *CaO........ .85 15.14%
> *MgO........ .03 .44%
> *K2O........ .01 .17%
> *Na2O....... .11 2.18%
> Fe2O3...... .01 .40%
> TIO2....... .00 .13%
> B2O3....... .21 4.68%
> AL2O3...... .50 16.29%
> SiO2....... 3.18 60.53%
> P2O5....... .00 .05%
>
> RATIO 6.32
> EXPAN 374.19
> WEIGHT 314.83
>
>
> RR
>
>
>>I am mixing up some matte green recipes and found one
>>I really wanted to try ( John's Frog Pond ) required FF 3124 which I
>>don't
>>have on hand,
>>lots of 3134 though.
>>
>>So thinking this would be a good chance to try my hand at glaze material
>>adjustment
>>I set about trying to figure out how to substitute the frits.
>>
>>I read where 3124 is basically 3134 with alumina so I tried to get the
>>SI:AL
>>ratio
>>close by adding ball clay and alumina and letting Glazemaster reset the
>>total to 100.
>>
>>I then compared the limit ratios and they all were within range. I did
>>try
>>fiddling with the
>>percentages of the other ingredients but got way out of whack so decided
>>to
>>try something
>>simple.
>>
>>What else should I have considered?
>>
>>Angela Davis
>>
>>The first is the adjusted recipe, the original is below it.
>>
>>Recipe Name: Frog Pond Green Matte W/3134
>>
>>Cone: 6 Color: light to med-dark green
>>Firing: Oxidation Surface: Matte
>>
>>Amount Ingredient
>>28 Frit--Ferro 3134
>>21 Wollastonite
>>28.7 Kaolin--EPK
>>12.8 Silica
>>1.8 Alumina Hydrate
>>7.7 Ball Clay--Old Mine #4
>>
>>100 Total
>>
>> Additives
>>3.2 Copper Carbonate
>>5 Rutile
>>
>>Unity Oxide
>>.151 Na2O
>>.006 K2O
>>.029 MgO
>>.813 CaO
>>1.000 Total
>>
>>.445 Al2O3
>>.292 B2O3
>>.007 Fe2O3
>>
>>2.831 SiO2
>>.007 TiO2
>>.001 P2O5
>>
>>6.4 Ratio
>>6.9 Exp
>>
>>Calculations by GlazeMasterT
>>www.masteringglazes.com
>>------------------------------------
>>
>>Recipe Name: Frog Pond Green Matte
>>
>>Cone: 6 Color: light to med-dark green
>>Firing: Oxidation Surface: Matte
>>
>>Amount Ingredient
>>31 Frit--Ferro 3124
>>23.2 Wollastonite
>>31.7 Kaolin--EPK
>>14.1 Silica
>>
>>100 Total
>>
>> Additives
>>3.5 Copper Carbonate
>>5.5 Rutile
>>
>>Unity Oxide
>>.11 Na2O
>>.012 K2O
>>.032 MgO
>>.846 CaO
>>1.000 Total
>>
>>.505 Al2O3
>>.204 B2O3
>>.007 Fe2O3
>>
>>3.225 SiO2
>>.004 TiO2
>>.001 P2O5
>>
>>6.4 Ratio
>>6.5 Exp
>>
>>Comments: Leach tested by John Hesselberth: Copper increased from 0.07 up
>>to 14.37 mg/l as copper carbonate levels was increased from 0.5% up to
>>5.0%.
>>Suggest holding copper carbonate to 2.0-3.5% where leaching was 0.14 and
>>4.73 mg/l respectively.
>>
>>0.5% was pale yellow/green, 1.0 and 2.0 were attractive light greens, 3.5
>>and 5.0 were attractive medium to medium-dark greens.
>>-----------------------------------
>>Calculations by GlazeMasterT
>>www.masteringglazes.com
>>------------------------------------
>>
>>______________________________________________________________________________
>>Send postings to clayart@lsv.ceramics.org
>>
>>You may look at the archives for the list or change your subscription
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>>
>>Moderator of the list is Mel Jacobson who may be reached at
>>melpots@pclink.com.
>> owner-claya
>
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
>
> ______________________________________________________________________________
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>
>
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