Ceramics (weathering)

Weathering clay

- the weathering of clay is a natural process in which the elements of weather assist the potter in making clay more usable.

The Dry Method (steps):

1.Gather the clay

2.Dry under the sun

3.Crush by hand/machine

4.Seive the clay

5.Mix sand & clay

6.Temper with water

7.Knead the clay

8.Wedging to eliminate air pockets

9.Form and stored

Simple Steps Methods:

1.Weathering the clay

2.Polverizing

3.Sieving

4.Mixing

5.Kneading

6.Aging

6.Ready to use

SODIUM SILICATE (defloculants)

-to make the clay thin

Granite

-non plastic clay

Chemical Processing

-produces a very refined clay suitable for high grade ware in industry

Basic Group Of Ingredients:

-Plastic Ingredients

-Stiffering Ingredients

-Fluxing Ingredients

Composition of Plastic Ingredients

-Kaolin

-Ball Clay

Composition of Stiffering Ingredients

-Flint

-Silica Sand

-Grog

Composition of Fluxing Ingredients

-Feldspar

-Whiting

-Frits

-Cornwall stone

-Bone ash

-Talc

Cooking Pot Clay

-must be able to withstand certain temperatures

Composition of Porcerain:

Limoges;

-42% Clay

-36.8% Feldspar

-19.5% Flint

-1.6% Whiting

Copenhagen;

-52% Clay

-45% Feldspar

-2.0% Flint

-1.0% Whiting

Electrical Porcelain;

-44% Clay

-37% Feldspar

-19% Flint