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Wall putty is a key material in the construction and renovation sectors, used primarily to create a smooth and even surface on walls before painting or wallpapering. A crucial additive in the formulation of wall putty is Hydroxypropyl Methylcellulose (HPMC), a cellulose ether that significantly improves the performance and quality of the product. This article delves into the functions and benefits of HPMC in wall putty, underpinning its importance in modern construction practices.