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.
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.