Hypromellose (HPMC) is a non-ionic cellulose ether that has several chemical properties, including:

1. Solubility: HPMC is soluble in cold water and forms a clear, viscous solution. It is also soluble in some organic solvents such as methanol, ethanol, and acetone.

2. Molecular weight: HPMC has a high molecular weight, ranging from about 10,000 to 1,500,000 g/mol, depending on the degree of substitution and viscosity grade.

3. Hydrophilicity: HPMC is hydrophilic, meaning it has a strong affinity for water. This property allows it to absorb and retain water, making it useful as a water retention agent in various applications.

4. Thermal stability: HPMC is stable over a wide range of temperatures and can withstand high temperatures without significant degradation.

5. Chemical stability: HPMC is chemically stable and can withstand exposure to acids, bases, and oxidizing agents without significant degradation.

6. Film-forming properties: HPMC has film-forming properties that make it useful in applications where a thin, uniform film is required. It can form films that are flexible, transparent, and resistant to water and oil.
   
    

HPMC (Hydroxypropyl Methyl Cellulose) is widely used in construction materials, where it serves several functions, including:

1. Tile adhesives: HPMC is used in tile adhesives to improve their workability and bonding strength. It also helps to prevent water loss, which allows for longer working times.

2. Cement-based products: HPMC is used in cement-based products such as mortars, renderings, and grouts to improve their workability, water retention, and adhesion.

3. Wall putty: HPMC is used in wall putty to improve its workability, reduce shrinkage, and prevent cracking.

4. Self-leveling compounds: HPMC is used in self-leveling compounds to improve their flow properties and prevent segregation.

5. Gypsum-based products: HPMC is used in gypsum-based products such as plasterboard, joint compounds, and textured coatings to improve their workability and reduce shrinkage.

6. Concrete admixtures: HPMC is used as a concrete admixture to improve the workability and pumpability of the concrete.

Overall, the use of HPMC for construction materials can improve their performance, workability, and durability, making them more reliable and effective for various construction applications.