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Alberta Slip Base Glaze 2

Code: GA6-B
Modification Date: 2018-12-03 21:02:45

MaterialAmount
Alberta Slip 1000F Roasted40.0
Alberta Slip40.0
Ferro Frit 319520.0
 100.00  

Notes

An alternative recipe to GA6-A (uses Ferro Frit 3195 instead of 3134). It fires to a more brilliant glossy surface.

This fires to a lower thermal expansion (by virtue of higher B2O3, Al2O3 and SiO2 levels) so will solve crazing issues on most bodies on which the GA6-A version crazes.

The chemistry in this is not compatible with the rutile blue version.

Out Bound Links

Pictures

GA6-A base using Frit 3249 and 3195 on buff body

The body is buff-burning Plainsman M340 (cone 6). The amber-colored glaze is 80% Alberta Slip (raw:calcine mix) with 20% of each frit. The inside of mug 1 is white engobed (L3954A) and with transparent over it (G2926B).

The GA6-B glaze uses Frit 3195, covering mug 2 completely. Mug 1 uses low expansion frit 3249, it fires to the same brilliant gloss. But its low expansion limits its use to low-silica bodies and hard-to-fit-glazes-to porcelains.

These mugs are fired using a drop-and-soak firing schedule yet no micro-crystals have grown as they would using the GA6-A recipe with Frit 3134.

GA6A Alberta Slip base using Frit 3124, 3249 and 3195

The body is dark brown burning Plainsman M390 (cone 6). The amber colored glaze is 80% Alberta Slip (raw:calcine mix) with 20% of each frit. The white engobe on the inside of two of the mugs is L3954A (those mugs are glazed inside using transparent G2926B). The Alberta Slip amber gloss glaze produces an ultra-gloss surface of high quality on mugs 2 and 3 (Frit 3249 and 3195). On the outside we see it this glaze on the white slip until midway down, then on the bare red clay. The amber glaze on the first mug (with Frit 3124) has a pebbly surface that is not working nearly as well. These mugs are fired using a drop-and-soak firing schedule.

GA6-B Alberta Slip base glaze does not crystallize

Right: The traditional Alberta Slip amber transparent has 80% Alberta Slip and 20% Ferro Frit 3134. It forms micro-crystals if the kiln is not cooled quickly. The Frit 3195 version on the left retains its brilliant transparent nature. The reason is the higher levels of Al2O3 (Frit 3134 has almost zero Al2O3).

P300 with AlbertaSlip:Frit 3195 glaze fires crystal-free

This glaze produces a flawless results with a normal free-fall cool cycle. But that is not what this was. In this cone 6 firing the temperature was dropped from 2200F to 2100F, held for 30 minutes, then dropped slowly (300F/hr) all the way down to 1400F. In that firing schedule the standard GA6-A base recipe would be completely covered in iron silicate crystals.

Alberta Slip on P300 with Frits 3134, 3124, 3249, 3195

This porcelain can be difficult to fit glazes to because it has a lower-than-normal silica content. Each of these test samples was thermal shock tested: 300F to ice water.

Frit 3134 version (top left) crazing.
3124 slight crazing (top right).
3249 and 3195 (bottom) are uncrazed.
3134 version has the cleanest surface but 3195 is close behind.

These were not slow cooled or drop-soaked during firing so they are all transparent.

XML to Paste Into Insight

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Alberta Slip Cone 6 Amber Base 2" keywords="An amber-colored glaze that produces a clean, micro-bubble-free transparent glass. Works well on brown and red burning stonewares." id="139" date="2018-12-04" codenum="GA6-B">
<recipelines>
<recipeline material="Alberta Slip 1000F Roasted" amount="40.000" added="0"/>
<recipeline material="Alberta Slip" amount="40.000" added="0"/>
<recipeline material="Ferro Frit 3195" amount="20.000" added="0"/>
<url url="https://digitalfire.com/4sight/recipes/alberta_slip_cone_6_amber_base_2_139.html" descrip="Recipe page at digitalfire.com"/>
</recipelines>
<urls/>
</recipe>
</recipes>


By Tony Hansen




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