HPMC Construction Grade Chemicals for Interior Finishing Render

HPMC, or Hydroxypropyl Methyl Cellulose, is a white, odorless, and tasteless cellulose ether commonly used in the construction industry as a thickener, binder, and water retention agent in interior finishing renders.

HPMC construction grade is specifically formulated for use in rendering applications and offers several benefits, including:

  • Improved workability: HPMC helps to improve the workability of render, making it easier to apply and smooth.
  • Reduced cracking: By improving water retention, HPMC helps to reduce the risk of cracking in the finished render.
  • Increased strength: HPMC can also help to improve the strength of the render, making it more durable.
  • Better adhesion: HPMC can improve the adhesion of the render to the substrate, reducing the risk of peeling or flaking.

HPMC is typically added to the render mix at a rate of 0.1-0.5% by weight of dry binder. The specific amount of HPMC needed will vary depending on the desired properties of the finished render.

Here are some additional things to keep in mind when using HPMC in interior finishing render:

  • HPMC is a water-soluble material, so it is important to ensure that the render mix is not exposed to excessive moisture during storage or application.
  • HPMC can be slightly hygroscopic, meaning that it can absorb moisture from the air. This can be helpful in some cases, but it can also lead to the formation of a film on the surface of the render if it is not stored properly.
  • HPMC is generally considered to be a safe material to use. However, it is always important to follow the manufacturer’s instructions when handling and using any chemical product.
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