Determination of Yield Stress of Petrolatum Acc. to USP 1912
From the penetration depth, which is determined in a simple measurement with Anton Paar’s penetrometer PNR 12, it is possible to easily calculate the yield stress acc. to USP 1912 of viscoelastic samples such as petrolatum. Thanks to this relationship between consistency and yield stress no additional rheometer is required.
Multiphase systems such as petrolatum exhibit a yield stress. Below the yield stress, these materials behave like (soft) solids. Knowledge of the yield stress is helpful for process design calculation, especially for simulating flow and velocity profiles through pipelines to improve the manufacturing process.
Plus, when researching a cream, lotion, or ointment the yield stress is crucial to achieving the desired feel on the skin. The formulations can be optimized when knowing the rheological properties. In addition, it is a suitable guideline to predict how well a cream or paste is spreadable.
This application report shows that the yield stress can easily be determined with PNR 12 according to USP 1912. The calculated yield stress via the penetration depth is a suitable alternative to the more complex measurement with Rheometer.
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