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A layer of hydrophilic material called protective colloid is wrapped around the surface of redispersible powder particles. This layer of material mainly plays a role in protecting polymer powder particles from damage during storage and transportation, and promoting their redispersion when polymer powder comes into contact with water. The vast majority of protective colloids for redispersible powder are polyvinyl alcohol (PVA).
One of the most pronounced differences between HEC and HPMC lies in their rheological properties. HEC tends to yield solutions that are less viscous compared to those derived from HPMC at equivalent concentrations. This is particularly beneficial in applications where a lighter texture is preferred. Additionally, HPMC solutions exhibit a more pronounced pseudoplastic behavior, meaning they can become less viscous under shear, making them suitable for applications requiring a smooth flow — such as in medicinal suspensions or topical formulations.
hec vs hpmc
