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The primary raw materials for HPMC production are cellulose and chemical reagents. Cellulose is derived from natural sources, typically wood pulp or cotton linters, which is then processed to extract the pure cellulose fibers. The quality of these raw materials significantly affects the properties of the final HPMC product, including its viscosity, purity, and solubility. Only high-quality cellulose is selected to maintain the integrity and performance of HPMC in its end applications.