DescriptionThe flow of powders and granular materials induces electrostatic charging, and it causes severe problems like agglomeration, adhesions to equipment surface, clogging, separations, and flawed product. Knowledge of charging trends of powders can be effective in decreasing its effects. Unfortunately, due to its complicated nature, charging tendencies of polymeric powders of the exact nature are poorly understood, although largely studied in the literature. Moreover, there is no standard and high precision method available for the characterization and comparison of the electrostatic behavior of powders. In this work, charge gain tendencies of microcrystalline cellulose and acetaminophen in contact with stainless steel are evaluated. The electrostatic charge of powders is first analyzed using a commercially available instrument, GranuChargeTM. Inspired by the limitations of GranuChargeTM and considering other methodologies described in the literature, a new setup is developed to measure mass flow rate and charge per unit mass simultaneously. The effect of geometrical parameters and the impact of the powder flowability on the flow pattern is studied to present a final methodology that gives reproducible charge measurements results with a controlled flow pattern. This methodology is suitable to standardize and can compare the triboelectric charging performance of different materials.