Plainsman Clays | OM4
OM#4 Ball Clay
OM#4 is a ball clay, a fine and very plastic clay that is added to a body for workability and dry strength, and to a glaze to keep the slurry together. It fires a cream buff.
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OM#4 is a fine, very plastic ball clay, and it makes a body workable. A porcelain or white stoneware built on kaolin alone is short and tears on the wheel, and adding a share of ball clay makes it plastic enough to throw. It is added to casting slips for the same reason, and to a glaze in a small amount, where its fineness keeps the heavier materials in suspension. Most bodies contain up to about a fifth within an incorporation, since it brings increased drying shrinkage along with the plasticity.
- A fine, very plastic ball clay
- For bodies, casting slips and glazes
- Commonly up to about a fifth of a body
- Fires to a cream buff
- Casting aid for suspension and strength
