Hydroxypropyl Methylcellulose (HPMC) is a key functional additive in modern dry mix mortar systems. As a high-efficiency cellulose ether, it significantly enhances mortar performance by improving water retention, workability, cohesion, and application stability. Understanding how hydroxypropyl methylcellulose improves dry mix mortar performance is essential for formulators, manufacturers, and construction material engineers who aim to produce consistent, high-quality mortar products.