The Role of HPMC and RDP in Wall Putty Formulas

Putty delamination, chalking, and cracking are three major problems that every dry-mix mortar manufacturer and contractor knows well. Once these issues happen, they lead to high rework costs and damage your project's quality reputation.

Many people immediately blame these problems on "poor construction work." However, the root cause often lies in the formulation design.

The Core Solution: The Powerful HPMC + RDP Duo

To solve these wall problems completely, you need to combine two essential additives in your formula:

• HPMC (Hydroxypropyl Methylcellulose) — For Water Retention

  • HPMC controls how fast water evaporates from the wet mix, ensuring that cement or gypsum hydrates completely.

  • It prevents early cracking and powder chalking caused by rapid water loss.

  • It improves workability, making the putty smoother to apply while extending the open time.

• RDP (Redispersible Polymer Powder) — For High Adhesion

  • RDP forms a flexible polymer film inside the putty structure.

  • It significantly boosts bonding strength to the wall base, which prevents delamination and hollow peeling.

  • It enhances the internal cohesion and overall flexibility of the dry-mix mortar.

The Result

By using the right balance of HPMC and RDP, your wall putty becomes much denser, sticks stronger, and resists cracking. Even when the substrate wall undergoes minor shrinkage or movement, the putty stays firmly in place without peeling off. When your formulation performs flawlessly, your construction projects become truly worry-free.