Appearance and properties: white or almost white fibrous or granular powder

Density: 1.39 g/cm3

Solubility: almost insoluble in absolute ethanol, ether, acetone; swelling in cold water into a clear or slightly dirty colloidal solution

Stability: The solid is flammable and incompatible with strong oxidants.

It is a semi-composition, inactive, viscoelastic polymer, often used as a lubricant in ophthalmology

Dissolving function: soluble in water and some solvents, such as ethanol/water, propanol/water in appropriate proportions. The aqueous solution has surface activity. High transparency and stable function. Different standard products have different gel temperatures and solubility changes with viscosity. The lower the viscosity, the greater the solubility. Different standards of HPMC have different functions. The dissolution of HPMC in water is not affected by pH.