HPM20 Volclay Bentonite
HPM20 is a microfine ground version of Volclay 325 bentonite. The extra grinding triples the price, thus this material is not commonly employed in ceramics (it is used as a suspending agent, viscosifier, binder, plasticizer and emulsion stabilizer). However, typical ground bentonites, like Volcay 325, can have more than 2% residue on the 200 mesh screen, this poses the possibility of fired ...