Chemical preparations operation
Chemical preparations operation means the collection of mixing, blending, milling, and extruding equipment used to manufacture chemical preparations. A chemical preparation operation may include all, or only some, of the equipment listed above, depending on the chemical preparation being manufactured. Mixing and blending equipment may be used to process either wet or dry materials, or a combination of wet and dry materials. Milling equipment includes, but is not limited to, various types of rolling mills, rotary mills, and grinders. Extruding equipment, for the purposes of this subpart, includes direct and indirect extruders, spray driers, and prilling towers.