Terri Storer on tue 27 jan 98
Hi Clayarters!
I have test results for the original simple glaze and Ron's 2
complicated versions. All 3 glazes were tested on white and red
stoneware, vertical and horizontal tiles. They were all fired in the
bottom half of my Skutt to cone 6 electric. The firing took
approzimately 12 hours with a 1 hour soak at top temp. I added 2%
rutile to all the glazes to test for color response, and used OM4 ball
clay (instead of bell dark).
I was somewhat surprised at how similar the glazes came out. The
vertical tiles were virtually identical. All three were a soft gray
opaque matt. My white stoneware has a little granular illmenite in it,
and small spots bleed through. I double dipped 1/2 of each tile, and
the glaze ran just a little. There was no discernable crazing. The
horizontal tiles had noticable differences. These tiles were more
mottled than the vertical ones, kind of like on oatmeal effect. The
original glaze was a warmer gray than either of the 2 complex versions.
The second complex version, where thick, was dry and sugary, and more
silvery than either of the other 2. On all tiles, the red stoneware
was more of a tan color than the white.
Terri Storer
in Colorado where it is warm and sunny, and the Broncos are the talk of
the town
> original c6 matte
> -----------------
> F4 SPAR............. 45.00 45.00%
> WHITING............. 18.00 18.00%
> BELL DARK........... 25.00 25.00%
> ZINC OXIDE.......... 12.00 12.00%
> ----------
> 100.00
> FORMULA & ANALYSIS
> ------------------
> *CaO........ .46 12.04%
> *MgO........ .01 .11%
> *K2O........ .06 2.53%
> *Na2O....... .12 3.50%
> *ZnO........ .36 13.49%
> Fe2O3...... .00 .32%
> TIO2....... .01 .42%
> AL2O3...... .37 17.61%
> SiO2....... 1.79 49.97%
> P2O5.......
>
> RATIO 4.82
> EXPAN 592.94
> WEIGHT 214.43
>
> My complicated version #1
>
> -----------------
> F4 SPAR............. 22.00 22.00%
> CUSTER SPAR......... 22.00 22.00% << G200 is ok as
> well
> WHITING............. 18.50 18.50%
> BELL DARK........... 11.50 11.50% << any ball clay
> EPK................. 11.50 11.50%
> ZINC OXIDE.......... 12.00 12.00%
> SILICA.............. 2.50 2.50%
> ----------
> 100.00
> FORMULA & ANALYSIS
> ------------------
> *CaO........ .46 12.02%
> *MgO........ .00 .09%
> *K2O........ .09 3.79%
> *Na2O....... .09 2.47%
> *ZnO........ .36 13.57%
> Fe2O3...... .00 .29%
> TIO2....... .01 .23%
> AL2O3...... .37 17.53%
> SiO2....... 1.80 49.98%
> P2O5....... .00 .02%
>
> RATIO 4.85
> EXPAN 597.19
> WEIGHT 215.75
>
> My complicated version #2
> -----------------
> F4 SPAR............. 20.00 20.00%
> NEPH SY............. 20.00 20.00%
> WHITING............. 18.00 18.00%
> BELL DARK........... 11.00 11.00%
> EPK................. 11.00 11.00%
> ZINC OXIDE.......... 12.00 12.00%
> SILICA.............. 8.00 8.00%
> ----------
> 100.00
> FORMULA & ANALYSIS
> ------------------
> *CaO........ .45 11.72%
> *MgO........ .01 .11%
> *K2O........ .05 2.21%
> *Na2O....... .13 3.77%
> *ZnO........ .36 13.53%
> Fe2O3...... .00 .26%
> TIO2....... .01 .22%
> AL2O3...... .38 17.68%
> SiO2....... 1.82 50.49%
> P2O5....... .00 .01%
> COST/KG 1.42
> RATIO 4.85
> EXPAN 584.18
> WEIGHT 216.41
>
> You post these to the list if you want - before or after you test them
> -
> what ever you like - but let me know what happenes and include all the
>
> recipes cause I don't keep em.
>
> Ron Roy
> 93 Pegasus Trail
> Scarborough,Canada
> M1G 3N8
> Evenings, call 416 439 2621
> Fax, 416 438 7849
> Studio: 416-752-7862.
> Email ronroy@astral.magic.ca
> Home page http://digitalfire.com/education/people/ronroy.htm
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