GA6A Alberta Slip Base comparison using Frit 3134, 3149, 3195

Share form Insight-live.com (Lab Documentation and Calculation System) by Digitalfire

These columns compare the original Alberta Slip cone 6 base (using Frit 3134) with versions using Frits 3249 and 3195 (which have a lower thermal expansion and produce a better glass).


Alberta Slip Base Glaze Cone 6

Code #

MA6A

Materials Amt
Alberta Slip 40.000
Ferro Frit 3134 20.000
Alberta Slip Calcined 40.000

Total:100.00

Unity Formula

CaO 0.47
MgO 0.24
K2O 0.09
Na2O 0.19
(KNaO) 0.28
B2O3 0.20
Al2O3 0.39
SiO2 2.71
Fe2O3 0.07

Si:Al Ratio

7.0:1

SiB:Al Ratio

7.5:1

Calculated
Expansion

7.6

LOI

3.7

Notes

The long-time cone 6 base recipe for Alberta Slip. To this are added colorants, opacifiers and variegators to create other glazes. Frit 3134 is not the only frit that works well, Frit 3249 (low expansion) and Frit 3195 (complete low fire glaze) also work well.

This version (having Frit 3134) is the only one that produces rutile blues in the cool-and-soak firing schedule. This is likely because this has a lower Al2O3 level (the extra alumina is likely preventing the crystalization of the TiO2 in the rutile).

This glaze is more stable, less runny that GA6A, yet is just as glossy. It has very good potential for use on porcelain (without crazing).

Pictures

MA6A Alberta Slip Base Glaze Cone 6 glaze cones

On M350 and M340

GA6A using Boraq 5 instead of Frit 3134

Appearance is identical.

GR6A and GA6A at cone 5R

Ravenscrag and Alberta Slip cone 6 bases.
On buff burning body.

GA6A and GA10A Alberta Slip bases at cone 5R, 10R

P300 with GA6A Alberta Slip base cone 6 glaze

Fired in a cool-and-soak firing. Glaze is showing its melt fluidity, running and pooling on contours.

MA6A plus 4% rutile at cone 6

Made by Joe Schmidt

Typecodes

ST-Untitled typecode

Alternate Code Number:GA6-A

Born: 2007-03-09, Modified: 2017-06-21 16:10:09

Alta Slip Cone 6 Base w/Frit 3195

Code #

L3500C

Materials Amt
Alberta Slip 40.000 21.05%
Ferro Frit 3195 20.000 10.53%
Alberta Slip Calcined 40.000 21.05%
Water 90.000 47.37%

Total:190.00

Unity Formula

CaO 0.44
MgO 0.28
K2O 0.11
Na2O 0.17
(KNaO) 0.27
TiO2 0.01
B2O3 0.22
Al2O3 0.51
SiO2 3.14
Fe2O3 0.08

Si:Al Ratio

6.1:1

SiB:Al Ratio

6.5:1

Calculated
Expansion

7.2

LOI

1.9

Cost

0.00 per kg

Notes

This is part of a program to compare the results of fluxing Alberta Slip for cone 6 using 4 different frits (3134, 3124, 3195 and 3249).
3249 and 3195 both produce a brilliant, stunning ultra gloss result. They work on porcelains, buff and dark stonewares. On M390 they produce a micro-bubble-free glass that really showcases the rich color of the body below.

This glaze is more stable, less runny that GA6A, yet is just as glossy.

Links with Schedules

To: Plainsman Cone 6ox drop-hold

Pictures

GA6A 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 white engobe on the inside of mug 1 is L3954A (also glazed inside using transparent G2926B). These frits are producing an amber gloss glaze of high quality. On the outside of mug 1 we see it this glaze on the white slip until midway down, then on the bare buff clay. These mugs are fired using a drop-and-soak firing schedule.

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.

Untitled

M390 clay with white engobe inside

L3954A engobe inside, clear glazed inside (G2926B). Outside is GA6A base using Frit 3195 instead of 3134. The result is a glossier more defect free glass.

a

Melted glaze for thermal expansion test has bubbled

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

This porcelain can be difficult to fit glazes to.
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.

P300 cylinder with AlbertaSlip:Frit 3195 glaze

Cone 6. Flawless results. Rutile firing schedule.

L3500C GA6A Base using Frit 3195 does not make rutile blue

Left is the standard GS6A with Frit 3134. Right has the rutile also, and was in the same firing, but the higher Al2O3 prevents its variegating action.

L3500 Frit 3249, 3195, 3124 ingots ready to fire

9 12gram balls in each refractory crucible.

Born: 2006-08-30, Modified: 2017-06-29 16:17:23

Alta Slip Cone 6 Base w/Frit 3249

Code #

L3500E

Materials Amt
Alberta Slip 40.000 21.05%
Ferro Frit 3249 20.000 10.53%
Alberta Slip Calcined 40.000 21.05%
Water 90.000 47.37%

Total:190.00

Unity Formula

CaO 0.33
MgO 0.47
K2O 0.10
Na2O 0.10
(KNaO) 0.20
TiO2 0.01
B2O3 0.27
Al2O3 0.50
SiO2 2.93
Fe2O3 0.08

Si:Al Ratio

5.9:1

SiB:Al Ratio

6.4:1

Calculated
Expansion

6.5

LOI

1.9

Cost

0.00 per kg

Notes

This is part of a program to compare the results of fluxing Alberta Slip for cone 6 using 4 different frits (3134, 3124, 3195 and 3249).
Frit 3249 is a low expansion frit, it reduces the expansion of the Alberta Slip base such that it works well on even P300 porcelain.

Even though this recipe calculates to a low Si:Al ratio and a very high MgO level (both indicative of a matte glaze), this one fires ultra glossy.

2700 water, 3000 dry gives 1.43

Pictures

GA6A 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 white engobe on the inside of mug 1 is L3954A (also glazed inside using transparent G2926B). These frits are producing an amber gloss glaze of high quality. On the outside of mug 1 we see it this glaze on the white slip until midway down, then on the bare buff clay. These mugs are fired using a drop-and-soak firing schedule.

P300 and M370 mugs with GA6A Alberta Slip (using Frit 3249)

Rather than the normal 80:20 AlbertaSlip:Frit3134 recipe, this one substitutes Frit 3249 (super low expansion). The glaze is less runny and even glossier. These are fired at cone 6 in a cool-and-soak firing. They survived boiling water:ice water tests without crazing. The finish is dazzling, a brilliant amber glass with no defects and perfectly even coverage. Of course, the iron in the glass prevents the colors of the blue underglaze from showing through. But the black is great.

Melted glaze for thermal expansion test has bubbled

GA6A base using Frit 3249 - P300 cone 6

Surface is flawless. Drop and soak firing.

L3500 Frit 3249, 3195, 3124 ingots ready to fire

9 12gram balls in each refractory crucible.

Born: 2006-08-30, Modified: 2017-06-21 15:32:46