HPM-20 Volclay Bentonite
Notes. HPM-20 is a micro-fine 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 …
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