Burgundy is an iron bearing, silty clay recommended for low and mid range firing applications.
This is not a substitute for their former Banta red clay. It has much lower plasticity, it cannot be used by itself (it needs to be mixed with highly plastic materials to make a body). It's drying shrinkage and dry strength are very low.
We had physical property data from them, but those numbers were so different from ones we measured that we are including ours.
Dry color: Yellow-brown
Fired color: Red to brown
Drying shrinkage: 3.5%
Total shrinkage (dry+fired): cone 6 - 9.5%, cone 1 - 5.5%
Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.
IMCO information on their mined clays
|Materials||Banta Red Clay|
|Suppliers||Industrial Minerals Co|