Using a shear cell tester to characterize flow agents in fine powders
Read this article to discover how using a shear cell tester can help you quickly and accurately determine the amount of flow agent you must add to your powder to reduce or eliminate flow problems.
Fine powders exhibit interparticle adhesion, which often makes them cohesive. This characteristic can cause several flow problems, including erratic flow, arching, ratholing, and equipment jams or blockages. A common way to reduce or eliminate these flow problems is to add a small amount of flow agent (also called a flow aid or anticaking agent) to the cohesive powder. Typical flow agents include fumed silica, clay, talc, zeolite, magnesium chloride, and stearic acid. These materials coat the surface of the powder particles, reducing or eliminating interparticle adhesion.