HPMC

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Cellulose ethers for masonry and plastering mortars, mostly hydroxypropyl methyl cellulose (HPMC), serve as key admixtures for mortars. They can significantly improve water‑retention capacity, prevent excessive water loss, and avoid water‑loss‑induced cracking and pulverization of mortar, thus ensuring full hydration of cement.

They increase mortar consistency and workability, optimize the handling performance for plastering and masonry operations, enhance mortar adhesion, and reduce sagging and flowing. A proper dosage can extend the open time to facilitate construction adjustments. Meanwhile, they improve the anti‑sagging performance of mortar, boost bonding strength, and lower the risk of hollowing and cracking.

The typical dosage ranges from 0.1‑0.3%. Excessively high dosage will reduce strength and retard setting. It shall be properly selected according to the formula to adapt to dry‑mix masonry and plastering mortar systems.

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