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Sand, F-65 - 100 lb. bag
SiO2 (99.8% SiO2) Often used in clay bodies instead of grog or to augment grog. However the particle size is often round and the angular shaped particles of grogs are usually more suited to clay bodies. In addition, the thermal expansion behavior of the quartz will contribute to dunting (grogs are available that have almost zero thermal expansion). Also used as a lubricant on kiln shelves to prevent ware from sticking and enable it to move while shrinking. Source: Digital Fire.
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