Two lots that pass the same incoming flowability spec can still granulate differently after roller compaction. The reason usually traces to ribbon density, which responds to roll force, gap width, and feed screw speed as an interacting set, not to roll pressure in isolation.
Talc's expected EU restriction is forcing cosmetic formulators toward mica, kaolin, silica, and starch. None of them reproduce talc's platelet slip, oil absorption, and low dustiness at the same time, and each substitution changes flow and compaction behavior in pressed powder products differently.
Cement fineness is not a single number. Blaine surface area, particle size distribution, grinding aid chemistry, and moisture history each pull on hydration reactivity in different ways, and a fineness specification that ignores any one of them will eventually let a bad batch through.
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