Why gypsum and ceramics destroy a standard head
Gypsum, calcined gypsum, alumina, zircon, silica, and other ceramic powders are harder than the pigments a paint mill usually sees. At 9,000 feet per minute, every particle that crosses the rotor-stator gap is an impact event. A stainless head that is fine for ink will open its clearance on this duty. Clearance is the process. Once the gap grows, shear drops, agglomerates survive, and the grind gauge stops moving even though the motor is still pulling amps.
Gypsum compounds also run heavy. Joint compound, board starch slurries, and filler pastes carry a high solids load that settles if the tank is only stirred. Ceramic slips and tape-cast bodies need the same thing from the mixer: break the clusters, hold a uniform solids load, and do it without shedding metal into the batch. A worn head does both kinds of damage. It leaves agglomerates, and it puts head metal into the slip.
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