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200 mesh is a critical line coarser than which materials intended for porcelains should not have particles, especially if they are speck producing.
| Tests | % Passing 325 Mesh Wet The amount of particulate material left on a 325 mesh sieve after washing through a measured amount of the powder. | 
| Typecodes | Particle Tests Tests conducted to determine particle populations, sizes, shapes, densities, surface areas, etc. | 
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