Pharmaceutical Analysis (Suppositories and Waxes) Rheometer

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TA Instruments handles a device called a "rheometer," which measures viscoelasticity. In this article, we will introduce examples of viscoelasticity measurements for familiar pharmaceutical cosmetics, specifically suppositories and hair wax, along with an easy-to-understand model of the measurement process. ◆ Softening Behavior of Suppositories in the Body For suppositories that are injected and used in the body, the viscoelasticity at storage temperature and body temperature significantly affects product performance. Therefore, we conducted temperature-dependent viscoelasticity measurements on two types of suppository samples. ◆ Application Feel of Hair Wax and Creep Recovery Test It is common to see a wide variety of hair waxes displayed, tailored to different hair types and desired hairstyles. When you pick them up, each has a different feel, suggesting variations in viscoelasticity. Using a rheometer, we can quantitatively evaluate basic viscoelastic indicators such as elasticity and viscosity. Additionally, as will be introduced below, we can assess the stretchability and holding power of hair wax through a measurement mode that mimics the application process on hair (creep recovery test).

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