The more viscous the suspension, the less fluid it is. Fluidity and viscosity are inversely related. 16 Triaxial whiteware bodies consist of three types of materials - clays, fluxes and fillers. Classically, silica was the filler and feldspar the flux. 17 Clays provide control the rheology of slips, and help provide green strength.
Fluxes reduce the firing temperature of the body.
18 Alumina is a filler in our whiteware body formulation. In traditional whiteware bodies, silica was used as a filler. Talc is a flux. Actually, talc is considered a secondary flux. Feldspar is the most important flux in our whiteware body.