Determination of Yield Stress of Petroleum Acc. to USP 1912
Anton Paar’s penetrometer and rheometer allow the determination of viscoelastic properties of petrolatum according to USP 1912. This application report describes the correlation between the penetration depth and the yield stress and offers an overview of the characteristic features of penetrometry and rheometry when dealing with semisolid samples.
Chapter 1912 of the US Pharmacopeia (USP) describes the determination of the yield stress of viscoelastic materials. [1] The lowest shear stress that must be applied to the material to initiate flow is defined as the yield stress.
Multiphase systems such as petrolatum, cements, soils, paints, pastes, printing inks, greases and a variety of food products such as salad dressing, sauces, and spreads exhibit a yield stress. Below the yield stress, these materials behave like (soft) solids.
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