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HES is characterized by hydroxyethyl groups that are introduced into the starch molecule through a reaction with ethylene oxide. This modification enhances its solubility in water, which is vital for its role in medical applications. The degree of substitution, which refers to the extent to which the hydroxyl groups on the starch have been replaced by hydroxyethyl groups, can vary, affecting the physico-chemical properties of HES. This variability allows it to be tailored for various uses.

1. Eastman Chemical Company As a leading manufacturer, Eastman provides a wide variety of cellulose derivatives, including cellulose acetate tow. The company focuses on sustainability by utilizing renewable resources and maintaining ecological responsibility in its operations.

1. Post-Surgical Care Patients who have undergone eye surgery, such as cataract procedures or LASIK, often experience dryness post-operation. HPMC eye drops are used to keep the eyes moist and aid in the healing process by preventing irritation.