Materials used in the manufacture of Ceramics
|Ball clays are plastic so are suitable for throwing and machine use. For casting they need greater addition of defloculents (chemicals to make them behave as a liquid when water is added). The colours produced after firing vary depending on the clay.|
Ball clays were initially dug out of the ground as blocks or balls - hence the name. Their geological age, chemical compositions and geographical locations vary greatly.
The main areas of occurrence are:
1) The Newton Abbot area of South Devon.
2) Torrington, North Devon
3) Dorset - Isle of Purbeck and Wimbourne
Extraction is done by both open cast and underground methods. Underground workings rarely extend more than 100 feet below the surface.
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