The penetration of new analytical techniques follows a well-defined path; first come the early adopters, who find out what new technology can do, assess its value and shape its evolution, and then, with a positive outcome, it transitions to the mainstream. Formulators can use information from a wide variety of techniques which means it can be easy to lose sight of what has become possible.

Recent advances in the design of rotational rheometers have transformed the accessibility, and value, of rheometry over just a few years. In this article we examine relevant and informative tests for the formulation of personal care products that rotational rheometry makes possible, that can’t be accessed using a rotational viscometer. Replacing an aging viscometer with like-for-like can be far from optimal; this article provides insight to support an up-to-date assessment of the value of upgrading.

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