Rheometer
A rheometer can measure parameters including viscosity, shear stress, shear rate, yield stress and viscoelastic properties.
Unlike a simple rotational viscometer, a rheometer can provide much more detailed information about how a formulation responds to different deformation conditions.
Cosmetic Applications
Rheometers are used during formulation development, troubleshooting, quality control and scale-up.
They can help determine why two formulations with similar apparent viscosity behave differently during dispensing or application.
Important Variables
Measurement temperature, sample preparation, measurement geometry, shear history and test protocol can all influence the result.
Therefore, rheological results are meaningful only when the test conditions are properly controlled and documented.
References
ISO 3219-1. Rheology — Part 1: General principles and rheometry.
Barnes, H. A. A Handbook of Elementary Rheology.
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