expanded clay
Expanded clay is ground clay that is fired in a kiln at 1,200 degrees Celsius. During combustion, the material expands spherically to four to five times its original volume.
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Expanded clay is ground clay that is fired in a kiln at 1,200 degrees Celsius. During combustion, the material expands spherically to four to five times its original volume.
Expanded shale consists of crushed shale. The grains have a plate-like shape and are very light.