The advanges of HPMC & MHEC in dry mix mortar products
November 22nd 2024
Hydroxypropyl methyl cellulose (HPMC) is a versatile polymer that is commonly used in the construction industry. In skim coat applications, HPMC is used as a thickener and water-retaining agent to improve the workability and adhesion of the product.
Skim coat is a thin layer of mortar or plaster that is applied to a substrate, such as a wall or ceiling, to create a smooth surface for painting or wallpapering. Skim coat is often used to cover imperfections or irregularities in the substrate, or to repair damaged surfaces.
HPMC is added to skim coat formulations to improve the consistency and workability of the mixture. It acts as a thickener, which helps to prevent sagging or dripping during application. It also improves the water retention of the mixture, which allows it to dry slowly and evenly, reducing the risk of cracking or shrinkage.
In addition to improving the workability of skim coat, HPMC also helps to improve the adhesion of the mixture to the substrate. It forms a bond between the skim coat and the substrate, creating a strong and durable surface for painting or wallpapering.
The amount of HPMC added to skim coat formulations will vary depending on the specific product and the application method. Typically, the recommended dosage of HPMC is between 0.2% to 0.5% of the total weight of the skim coat mixture.
Overall, the use of HPMC in skim coat applications is an effective way to improve the consistency, workability, and adhesion of the product. By adding HPMC to skim coat formulations, builders and contractors can create a smooth and durable surface for painting or wallpapering, while also reducing the risk of cracking or shrinkage.
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