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HPMC for Putty Powder

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Brief Product Description

HPMC for putty powder is a key functional additive in interior and exterior wall filler formulations, providing water retention, adhesion, anti-sagging, and smooth workability. It enables consistent application, reduces cracking on drying, and ensures a flat, paint-ready surface finish.

Product Overview

EASONZELL™ HPMC grades for putty powder are optimized for white cement-, grey cement-, and lime-based wall fillers. Putty is one of the highest-volume applications for HPMC globally, and our range covers the full spectrum from basic single-layer interior putty to high-performance crack-resistant exterior filler systems.

In a typical putty powder formula (white cement + calcium carbonate + HPMC ± HPS), HPMC is the primary functional additive. It governs the two critical performance parameters: water retention (which determines adhesion to the substrate and workability window) and viscosity/thixotropy (which governs ease of application and anti-sagging on vertical walls). Our putty powder grades are available in both standard and high-viscosity options, with delayed dissolution surface treatment for dry bag pre-blending.

Specification

ParameterTypical Value / RangeTest Method
AppearanceWhite to off-white powderVisual
Viscosity (2% aq., 20°C)60,000 – 200,000 mPa·sASTM D2364
Methoxy Content28 – 30%Titration
Hydroxypropoxy Content7 – 12%Titration
Moisture Content≤ 5.0%ISO 585
Gel Temperature58 – 68°CCloud point
Ash Content≤ 5.0%ISO 1577
Water Retention≥ 97%DIN 18555-7
Recommended Dosage0.2 – 0.5% of dry mix—

Application

EASONZELL™ HPMC for putty powder serves these principal applications:

  • Interior wall putty (single and double pass) — provides a smooth, uniform surface for subsequent painting or wallpaper application.
  • Exterior wall putty — high-viscosity grades with enhanced water retention for outdoor conditions and temperature variation.
  • Crack filler and repair putty — flexible formulations for hairline crack repair before decoration.
  • Skim coat over concrete — thin-layer application requiring excellent adhesion and smooth troweling.

Usage notes: For interior putty, typical application thickness is 1–2 mm per coat. Ensure substrate is clean, dust-free, and moderately absorbent before application. In hot or dry conditions, increase HPMC dosage or add HPS to extend workability.

Advantages

  • High water retention (≥97%) — prevents premature drying and ensures complete cement or lime hydration for maximum adhesion.
  • Smooth, creamy consistency — excellent workability and trowel-ability for both professional and DIY applicators.
  • Strong adhesion — bonds reliably to concrete, brick, gypsum board, and previously painted surfaces.
  • Anti-cracking — flexible film reduces drying shrinkage, resulting in a crack-free finish coat.
  • Broad viscosity range — from 60,000 to 200,000 mPa·s to match different putty thickness, application method, and climate conditions.
  • Cost-optimized with HPS — can be blended with HPS to reduce total additive cost while maintaining core performance.

Frequently Asked Questions

  • Q: What HPMC viscosity is standard for interior wall putty?
  • A: The most common range for interior putty is 100,000–150,000 mPa·s (2% solution, 20°C). This provides a good balance between workability and water retention. In regions with very dry climates or for exterior use, 150,000–200,000 mPa·s is preferred.
  • Q: Why does my putty crack after drying?
  • A: Cracking typically results from insufficient water retention (HPMC dosage too low), excessive application thickness, or application onto an overly absorptive substrate without priming. Increasing HPMC by 0.05–0.1% and ensuring the substrate is properly primed usually resolves this.
  • Q: Can I use the same HPMC grade for both interior and exterior putty?
  • A: Not ideally. Exterior putty requires higher water retention and greater resistance to temperature fluctuation, which calls for higher-viscosity HPMC (150,000–200,000 mPa·s) and possibly a higher dosage. Using interior-grade HPMC outdoors may result in shorter open time and adhesion issues in hot or dry conditions.
  • Q: How does the HPMC-to-HPS ratio affect putty performance?
  • A: A typical starting point is 3:1 or 4:1 (HPMC:HPS) by weight. Increasing HPS improves lubricity and reduces cost, but above a certain ratio, water retention and adhesion can suffer. Always verify the final formulation with adhesion pull tests and open time measurements.
  • Q: Is HPMC in putty food-safe or hazardous?
  • A: HPMC itself is non-toxic and used in food and pharmaceutical applications. In putty powder, the primary safety consideration is dust inhalation during dry mixing — appropriate dust masks should be worn. The cured putty on walls poses no health risk under normal conditions.
  • Q: Do you offer private-label or custom-grade HPMC for putty?
  • A: Yes. We offer custom viscosity, particle size, and dissolution speed tailored to your specific putty formula. Minimum order for custom grades is typically 5 MT. Please contact our technical sales team with your target specification.

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About Us
Zhejiang Yisheng New Material Co., Ltd.
Zhejiang Yisheng New Material Co., Ltd. is a professional enterprise engaged in the design, development, manufacturing, application, and sales of cellulose ether, located in the Shangyu Economic and Technological Development Zone, part of the Hangzhou Bay National Industrial Park. With a core concept of safety, environmental protection, and sustainable development, the company boasts an annual production capacity of 15,000 tons of cellulose ether, offering a complete range of products including HEC (hydroxyethylcellulose), HEMC (hydroxyethyl methylcellulose), and HPMC (hydroxypropyl methylcellulose). Our products serve various sectors such as oil fields, coatings, dry powder mortar, cosmetics, personal care products, medicine, and many others. Yisheng has a global presence, providing stable cellulose ethers and services to customers worldwide.
As a professional China HPMC for Putty Powder Supplier and HPMC for Putty Powder Company, The company adheres to the principles of safety and environmental protection as the foundation of its development. It implements and further consolidates safety and environmental protection measures, striving to create green and environmentally friendly production processes, safe and effective control systems, and orderly production management. This approach lays a solid foundation for the company's sustainable development. Yisheng boasts a scientific management mechanism, a comprehensive quality management system, stringent product testing methods, advanced technology, state-of-the-art equipment, and high-quality after-sales service.
Zhejiang Yisheng New Material Co., Ltd.

+86-18067879812
Zhejiang Yisheng New Material Co., Ltd.

sarah@ys-cellulose.com
Zhejiang Yisheng New Material Co., Ltd.