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Questions asked by users might not always be phrased in the clearest way.
Yes, Hydroxypropyl Methylcellulose (HPMC) can be used as an additive to reduce the water absorption rate of a material. HPMC is a water-soluble, non-ionic cellulose ether that is commonly used as a thickener, binder, and film-forming agent in a variety of industries, including the construction industry. When added to a mixture, HPMC forms a protective layer around the material, which helps to reduce the rate at which water can penetrate and be absorbed. This can be beneficial in applications where it is important to maintain the integrity of the material in the presence of water or moisture.