A low fire talc body lacks plasticity when slip-mixed, but not when pugged


Thursday 6th October 2016

This clay was slurried in a mixer and then poured onto a plaster table for dewatering. During throwing it is splitting when stretched and peeling when cutting the base. Yet when this same clay is water-mixed and pugged in a vacuum de-airing pugmill it performs well. One might think that the slurry mixer would wet all the particle surfaces better than a pugmill, but it appears the energy that the latter is putting into the mix is needed to develop the plasticity when there is a high talc percentage in the recipe.

Pages that reference this post in the Digitalfire Reference Database:

Talc, De-Airing Pugmill, Plasticity


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