why the building materials add HPMC ?

HPMC stands for Hydroxypropyl Methyl Cellulose. It is a non-ionic cellulose ether that is commonly used as a thickener, binder, emulsifier, and stabilizer in a wide range of industries, including the construction industry.

In the construction industry, HPMC is often added to building materials such as cement, mortar, and plaster to improve their workability, adhesion, and water retention properties. Specifically, HPMC helps to improve the rheological properties of these materials, making them easier to apply and allowing them to adhere better to surfaces.

HPMC is also often used as a replacement for traditional additives such as animal-based glues and starches, which can be prone to microbiological degradation and have variable quality.

Overall, the addition of HPMC to building materials helps to improve their performance and can make them easier to work with, leading to better quality construction projects.