The ConJet is a spiral jet mill with an internal classifier for accurate and reproducible particle size control. The ConJet features a variable speed classifier for infinite fineness control with micronization to d50 ~ 1 µ with a very sharp particle size curve with low energy use. This jet mill operates without residual material at the end of the process making ideal for processing high value materials. Product contact parts can be high tech and high strength ceramic materials for metal contamination free processing such as yttrium stabilized zirconium oxide classifier wheel and grinding chamber or stainless steel parts with surface finish of Ra = 0.6 µ. All product contact parts can be sterilized with autoclave (depending on machine size).