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Redispersible Polymer Powder (RDP)

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Brief Product Description

Redispersible Polymer Powder (RDP) is a spray-dried, free-flowing polymer powder that re-emulsifies readily in water to form a stable polymer dispersion. Added to dry-mix mortars, it significantly enhances flexibility, adhesion, tensile strength, and durability of cured building materials including tile adhesives, renders, EIFS base coats, and self-leveling compounds.

Product Overview

EasonZell™ RDP is based on vinyl acetate-ethylene (VAE) copolymer chemistry, spray-dried in the presence of a protective colloid (polyvinyl alcohol) to produce a free-flowing powder. Upon contact with water in the mortar mix, the powder redisperses to form a fine latex emulsion, which upon drying coalesces into a continuous polymer film within the mineral matrix.

This polymer film bridges microcracks, enhances adhesion to challenging substrates (glass, metal, old paint), and imparts a degree of flexibility that purely mineral mortars lack. RDP is one of the most versatile performance additives in modern dry-mix mortar technology, and its combination with cellulose ether (HPMC/HEMC) is considered the cornerstone of high-performance thin-layer mortar systems.

Specification

ParameterTypical Value / RangeTest Method
AppearanceWhite free-flowing powderVisual
Polymer BaseVAE (vinyl acetate-ethylene) copolymer—
Solid Content≥ 98%Drying method
Bulk Density400 – 550 g/LISO 60
Ash Content (at 800°C)10 – 14%ISO 1577
Minimum Film-Forming Temp. (MFFT)0 – 5°CISO 2115
Glass Transition Temp. (Tg)+5 to +15°CDSC
Particle Size (D50)80 – 150 µmLaser diffraction
Recommended Dosage1 – 5% of dry mix weight—

Application

EasonZell™ RDP is a key ingredient in high-performance dry-mix mortar systems:

  • Tile adhesive (C2 grade, EN 12004) — increases tensile adhesion strength, especially after water immersion and freeze-thaw cycling.
  • EIFS / External Thermal Insulation Composite Systems (ETICS) — provides essential flexibility and impact resistance for base coats over EPS and mineral wool boards.
  • Repair mortars — excellent adhesion to old concrete, masonry, and steel substrates.
  • Self-leveling underlayments (SLU) — reduces surface cracking and improves wear resistance.
  • Tile grout — improves stain resistance, flexibility, and adhesion in thin-joint applications.

Usage notes: Always blend RDP with dry components before water addition. RDP is sensitive to prolonged exposure to high humidity — store in sealed bags. Do not add RDP directly to liquid admixtures.

Advantages

  • Enhanced adhesion — polymer film dramatically increases adhesion to glass, ceramics, metals, and low-porosity substrates.
  • Improved flexibility — lowers E-modulus of the cured mortar, accommodating differential thermal movement.
  • Excellent redispersibility — complete re-emulsification in water ensures uniform polymer distribution throughout the mortar matrix.
  • Freeze-thaw stability — enhances durability of tile adhesives and renders in cold climates.
  • Compatible with cellulose ethers — synergistic combination with HPMC/HEMC/HPS for optimized fresh and hardened mortar properties.
  • Broad application range — a single grade suits most standard dry-mix mortar applications, simplifying purchasing logistics.

Frequently Asked Questions

  • Q: What is the difference between VAE-based RDP and acrylic-based RDP?
  • A: VAE-based RDP offers a better balance of adhesion, flexibility, and cost-performance for general construction applications. Acrylic-based RDP provides higher UV stability and better performance in exterior high-temperature applications but at a higher cost. For most tile adhesive and EIFS base coat uses, VAE RDP is the industry standard.
  • Q: Can RDP be used in gypsum-based formulations?
  • A: Yes. RDP is compatible with gypsum binders. In gypsum systems, RDP reduces brittleness, improves surface hardness, and enhances adhesion to painted or smooth surfaces. Typical dosage in gypsum skim coat is 1–2%.
  • Q: How does RDP interact with HPMC or HEMC in mortar?
  • A: RDP and cellulose ether have complementary roles. Cellulose ether manages fresh mortar rheology (water retention, workability, open time), while RDP governs hardened mortar properties (adhesion, flexibility). Together they define the performance class of the mortar system.
  • Q: Is your RDP REACH and CE-mark compliant?
  • A: Our RDP is manufactured in compliance with relevant safety and environmental standards. Safety Data Sheets (SDS) and technical documentation for regulatory compliance purposes are available upon request. Please specify your target market's regulatory framework when inquiring.
  • Q: What happens if RDP absorbs moisture before use?
  • A: Moisture absorption causes RDP particles to partially coalesce, reducing redispersibility and potentially forming lumps in the dry mix. This negatively impacts mortar performance. Always store RDP in sealed bags at less than 65% relative humidity and use within 12 months of production.
  • Q: What is the minimum order quantity for RDP?
  • A: Standard RDP is supplied in 25 kg multi-wall paper bags. Minimum order is typically 1 MT for sample/trial orders. Full container (FCL) quantities of 20 MT are available with preferential pricing. Please contact our sales team for current pricing and lead time.

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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 Redispersible Polymer Powder (RDP) Supplier and Redispersible Polymer Powder (RDP) 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.