The particle crowding index and interparticle spacing terms were calcu
lated for seven alumina suspensions. The particle crowding index was u
sed to interpret the casting rate for the tested alumina suspensions;
the index was successfully correlated with the casting rate for cakes
that produced the same modes of porosity, Unfortunately, this index co
uld not be correlated with the casting rate for the particle system th
at produced varied porosity as a function of composition. The interpar
ticle spacing term was correlated with viscosity for particle size dis
tributions between 31 and 0.1 mu m. For particle size distributions ex
tended to 44 mu m, the viscosity could not be correlated with interpar
ticle spacing, because the quantity of fine particles, rather than the
particle packing, controlled the viscosity.