The FT4 Powder Rheometer offers dynamic, bulk, and shear property testing capabilities and incorporates well-defined methodologies and software for the measurement and interpretation of wall friction angles, according to the company. Wall friction angles quantify the strength of interactions between a powder and surface and are extremely useful for ranking and comparing the ability of a coating to ease powder flow. They are also central to hopper design calculations.
EMCS provided Freeman Technology with six coated wall friction discs for testing. Evaluation took the form of back-to-back testing with two competitor products already offered for food and pharmaceutical applications. Of the coatings tested, certain that are proprietary to EMCS exhibited excellent performance characteristics for a number of powders including Respitose, an excipient widely used in the pharmaceutical industry.