Personal Care | Testing Structural Recovery of Shampoo with the Rotational Rheometer RheolabQC

The ability of shampoo to recover its structure after dispensing is of great importance for consumer experience. Therefore, methods on how to investigate the recovery and flow behavior of shampoo with RheolabQC are described in this report.

To improve consumers' experience, shampoo formulations can be tested with RheolabQC. A fast recovery and non-Newtonian behavior are desired, as it should stay on the palm of the hand after dispensing but disperse easily in the hair when applied. RheolabQC allows the investigation of these properties by testing for structural recovery and flow behavior. This flow behavior of shampoo can also influence the filling process, as thin formulations might lead to spilling issues. Therefore, this report aims to support the optimization and quality control of shampoo formulations.

Structural recovery

Shampoo should only flow from the bottle when actively being dispensed. Its formulation therefore needs to provide structural strength which can temporarily be decreased by applying stress to the bottle. After the user dispenses the content onto their hand, the structure should recover, so the shampoo does not run off immediately. The term thixotropy describes this behavior, and it can be investigated with a 3-interval thixotropy test (3-ITT). The method and results are shown in this report.

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