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One of the most fascinating aspects of HPMC is its structure. As a derivative of cellulose, it is produced through a series of chemical processes that involve etherification of cellulose with propylene oxide and methyl chloride. The resulting polymer is soluble in water, which distinguishes it from other cellulose derivatives like methylcellulose. HPMC comes in various grades, each with different degrees of hydroxypropyl and methyl substitution, which can influence its solubility and thickening capacity.