Chemical HPMC Used in Cement Based Skim Coat
HPMC (Hydroxypropyl Methyl Cellulose) is also a valuable additive for cement-based skim coats, not just gypsum! It offers similar benefits to those seen in gypsum, but with some key points to consider:
Advantages of HPMC in Skim Coats:
- Improved Workability: Just like with gypsum, HPMC acts as a thickening agent, making the skim coat smoother and more manageable. This allows for easier application and better control during troweling, leading to a more even finish.
- Enhanced Adhesion: Similar to gypsum, HPMC forms a thin film on the surface of the skim coat, acting as a bonding agent. This strengthens the adhesion between the skim coat and the underlying substrate, creating a more secure bond.
- Water Retention: HPMC helps prevent the skim coat from drying out too quickly, which can cause cracking and reduce workability. By retaining water, HPMC extends the working time of the mix, giving applicators more time to manipulate and finish the surface. This is especially crucial in hot or dry environments.
- Reduced Cracking: By preventing rapid drying and improving workability, HPMC helps minimize the formation of cracks in the finished skim coat.
