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Bentonite * Other products by Miscellaneous

Item No. CHBENT
$1.05
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To take advantage of the bulk discounts when ordering full 50# bag quantities, please click on this item: Bentonite
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To take advantage of the bulk discounts when ordering full 50# bag quantities, please click on this item: Bentonite

Western Bentonite (sodium bentonite) is most frequently used by potters and is the only type Bracker's carries. Southern Bentonite (calcium bentonite) is not available at Bracker's, but can be found at some metal casting foundry suppliers.
Bentonite is a very fine-grained (colloidal) clay of the montmorillonite type containing bases and iron, derived from volcanic ash. The particle size is probably under 0.03% of the average kaolinite grain. It is a very sticky clay with a high shrinkage and a tendency to crack during firing and cooling...but its super-plasticity can help short bodies such as porcelains. It also assists the suspension of a glaze. - p. 20, Illustrated Dictionary of Practical Pottery, 3rd Ed. by Robert Fournier
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