This document provides information about jet mills, including: 1. Jet mills can be used to grind chemicals, pharmaceuticals, metals, and other materials into very fine, uniform particles down to 2 microns. 2. The jet mill uses high-pressure air to grind materials in the grinding chamber. Finely ground material is classified and collected while oversized particles are reground. 3. Jet mills produce low heat during grinding, making them suitable for heat-sensitive materials. They have a compact design and can grind materials using inert gases in a closed system.