3)Hydroxypropyl Methylcellulose exhibits stability in acidic and alkaline conditions, with its aqueous solution remaining stable within a pH range of 2 to 12. It is minimally affected by sodium hydroxide and lime water, but alkaline conditions can accelerate its dissolution and slightly increase viscosity. Hydroxypropyl Methylcellulose demonstrates stability in the presence of common salts, although at higher salt concentrations, there is a tendency for increased viscosity in its solution.