The Rheology of Pharmaceutical Products
Physical tests for rheological behavior are performed by R&D scientists who qualify new formulations for processability in manufacturing and acceptability to customers when consumed. Rheology is the science of flow behavior and applies to a broad range of materials, ranging across powders, liquids, soft solids (E.g. ointments), and solids (E.g. tablets, hard shell capsules). Instruments used to conduct these tests include viscometers, rheometers, texture analyzers, and powder flow testers. QC has responsibility to implement “short” versions of these tests to verify that product with consistently acceptable quality is manufactured on a daily basis.