Alisa Clausen on sun 7 dec 03
Glaze test for Pinnell's Strontium Mat White and Ron Roy's revison
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: Clayart
Credited to: Peter Pinnell, revison Ron Roy
Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
5 min. soak
cool down max. to 800c
Hold 1 hour
Shut off kiln
Recipe:
Pinnells Strontium Mat White
1.0 Lithium Carb.
20 Strontium Carb.
60 Nepheline Syenite
10 Ball Clay
9 Silica
ADD
5.0 Titanium Dioxide
Note: All raw materials are measured up or down to the nearest whole =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in precent =
to the 100 gram test batch.
Substitutions: None
Results: White mat glaze that is covering. Semi mat where thickest and =
thoroughly melted. Drier, rougher surface and immature looking where =
thinnest.
Ron Roy's revsion of above glaze
recipe:
1.0 Lithium Carb.
20 Strontium Carb.
20 Nepheline Syenite
10 Ball Clay
9 Flint
40 Spodumene
ADD
5 Titantium Dioxide
2 Bentonite
Substitutions: None
Results: White covering glaze that is dry and pebbly. In both thick and =
thin areas, glaze appars to be immature at cone 6.
The revision was made to help with a crazing problem of the original =
recipe. Neither glaze crazed on my claybody.
Regards from Alisa in Denmark
| |
|
