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    Another important application of HPMC is as a sustained-release agent in drug delivery systems
    use
    use of hydroxypropyl methylcellulose. By controlling the release of the active ingredient, HPMC helps to improve the efficacy and safety of pharmaceutical products. Its ability to form a gel-like matrix in the gastrointestinal tract allows for controlled and prolonged release of the drug, resulting in a more consistent absorption profile and reduced side effects.

    An aqueous solution of HEC is a non-Newtonian fluid, and its viscosity changes as the shear rate changes.
    The viscosity increases as the shear rate decreases, while the viscosity decreases as the shear rate increases (thixotropy).
    The thixotropy of an aqueous solution of HEC increases with higher viscosity products with higher molecular weight, and decreases with lower viscosity products. Low-viscosity products have very low thixotropy and exhibit characteristics similar to Newtonian fluids.