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HPMC viscosity tables categorize the polymer based on its viscosity in aqueous solutions, often measured at a specific concentration (commonly 2% w/v) and temperature (typically 20°C). The table includes grades of HPMC, such as low, medium, and high viscosity, with corresponding viscosity values. These grades allow formulators to select the appropriate type of HPMC for their specific needs.
hpmc viscosity table

The degree of substitution (DS) of HEC, which indicates how many hydroxyl groups have been replaced by hydroxyethyl groups, can be controlled during production to tailor the properties of the final product. Higher DS values generally lead to increased solubility and viscosity. After the reaction, the HEC is purified and dried to produce a fine white powder that is easily reconstituted in water.
hec cellulose
