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How to Make Perfect Wall Putty with HPMC
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Wall putty is the foundation of a smooth, durable wall finish. To achieve excellent workability, water retention, and surface smoothness, HPMC (Hydroxypropyl Methylcellulose) is the key additive.

Why HPMC in Wall Putty?
  1. Water Retention – Prevents the putty from drying too fast, allowing cement to hydrate fully and improving bonding strength.
  2. Workability – Makes the mix smooth, easy to apply, and reduces drag on tools.
  3. Sag Resistance – Ensures the putty stays on vertical surfaces without slipping.
  4. Surface Finish – Produces a smooth, crack-free surface ready for paint.

General Wall Putty Formula (by weight)
  • White Cement: 40–50%
  • Calcium Carbonate (fine powder): 40–50%
  • Polymers & Additives: 1–3%
  • HPMC: 0.2–0.5% (depending on viscosity & grade)
  • Optional Additives: Starch ether (for anti-sag), dispersing agents, defoamers, preservatives

Step-by-Step Process
  1. Dry Mixing
    • Mix white cement and calcium carbonate thoroughly in a ribbon blender or similar mixer.
    • Add other powder additives (except HPMC) and mix evenly.
  2. Adding HPMC
    • Pre-mix HPMC cellulose ether with a small portion of filler (CaCO₃) to prevent lumping.
    • Ensure even distribution in the dry mix.
  3. Final Mixing
    • Blend until the mix is uniform and free-flowing.
    • Store in moisture-proof bags.
  4. On-Site Application
    • Add water gradually (≈ 35–40% by weight of powder).
    • Stir until smooth paste is formed.
    • Apply with a putty knife in thin coats (1–2 mm).
    • Allow each layer to dry before sanding/painting.

Tips for “Perfect” Putty
  • Choose HPMC viscosity between 40,000–60,000 cps for ideal water retention and smoothness.
  • Use high-purity CaCO₃ for extra whiteness and smooth finish.
  • Ensure consistent mixing – lumps mean uneven hydration.
  • Control environmental factors – avoid direct sun during application.

With the right grade of HPMC celluloses, your wall putty will have smooth spreadability, crack resistance, and a flawless finish ready for painting or coating.
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Messages In This Thread
How to Make Perfect Wall Putty with HPMC - by hktkljn - 08-18-2025, 09:45 AM

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