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Redispersible Polymer Powder Manufacturer

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Brief Product Description

Redispersible Polymer Powder (RDP) is a spray-dried polymer dispersion that instantly redisperses in water to form a stable polymer emulsion. As a critical additive in dry-mix mortar systems, RDP dramatically enhances flexibility, adhesion, impact resistance, and durability of tile adhesives, renders, and skim coats — properties that cannot be achieved by cement and sand alone.

Product Overview

RDP is manufactured by spray-drying aqueous polymer dispersions (typically vinyl acetate-ethylene copolymers, VAE or VAC-VeoVa types) in the presence of protective colloids such as polyvinyl alcohol (PVA). Upon addition of water in the mortar mix, the powder redisperses to reform a stable polymer film within the cementitious matrix.

The polymer film formed after curing bridges micro-cracks, reduces brittleness, and improves adhesion to difficult substrates such as glazed tiles, painted surfaces, and expanded polystyrene (EPS) boards. This makes RDP indispensable in high-performance EIFS, flexible tile adhesives (C2S1/C2S2), and self-leveling compounds.

Our RDP series is formulated to offer excellent redispersibility, low minimum film formation temperature (MFFT), and compatibility with cellulose ethers and other standard mortar additives. The powder is free-flowing and non-blocking under standard storage conditions.

Specification

ParameterSpecificationTest Method
AppearanceWhite free-flowing powderVisual
Solid Content (%)≥ 98.0ISO 3251
Ash Content (%)8.0 – 14.0ASTM D5630
Moisture Content (%)≤ 2.0ISO 3252
Bulk Density (g/L)450 – 600ISO 60
Min. Film Formation Temp. (°C)0 – 5ISO 2115
Glass Transition Temp. Tg (°C)0 – 15 (grade dependent)DSC
Particle Size (D50, μm)80 – 150Laser diffraction
pH (10% solution)5.0 – 8.0pH meter

Application

  • Flexible Tile Adhesives (C2S1/C2S2): Increases deformability and adhesion strength; enables bonding large-format tiles and natural stone.
  • EIFS Base Coats: Provides crack resistance, flexibility, and weatherproof adhesion on EPS and mineral wool substrates.
  • Self-Leveling Compounds: Reduces brittleness of high-cement compounds and improves surface abrasion resistance.
  • Skim Coats & Wall Putty: Improves adhesion to concrete and improves wet-scrub resistance of the finished surface.
  • Waterproofing Slurries: Contributes to flexibility and crack-bridging in cement-based waterproof coatings.
  • Repair Mortars: Enhances substrate bond, reduces shrinkage, and improves durability in thin-section repairs.
  • Tile Grout: Reduces water absorption and improves stain resistance of the grout joint.

Standard dosage: 1.0–5.0% by weight of dry mix. Higher dosages (3–5%) are used for demanding applications requiring flexibility (S1/S2 class). RDP should be dry-blended thoroughly with other powder components before adding water.

Advantages

  • Dramatically improves flexibility: Polymer film bridges micro-cracks and reduces mortar brittleness significantly.
  • Superior adhesion: Enhances bond strength on difficult substrates including glass, metal, and non-absorbent surfaces.
  • Excellent redispersibility: Rapid and complete redispersion in water, even after prolonged dry storage.
  • Frost resistance: Improves the freeze-thaw cycle resistance of cured mortar systems.
  • Water resistance: Reduces the capillary water absorption of hardened mortars.
  • Compatibility: Fully compatible with cellulose ethers (HPMC, HEMC, HEC), HPS, and other common mortar additives.
  • Extended shelf life: 12–24 months in original sealed packaging under ambient storage conditions.
  • Q: What is the difference between RDP grades for tile adhesive and EIFS?
  • A: Tile adhesive grades typically have a lower glass transition temperature (Tg) to provide better flexibility at room temperature. EIFS grades may have higher Tg for better temperature resistance and weathering performance. We offer both and can recommend the optimal grade for your system.
  • Q: Can RDP be used in external waterproofing systems?
  • A: Yes. RDP is a key ingredient in cement-based waterproofing slurries, providing the crack-bridging and flexible film properties necessary for long-term waterproofing performance on foundations, roofs, and wet rooms.
  • Q: How does RDP affect the water demand of mortar mixes?
  • A: RDP typically has a minor plasticizing effect that may slightly reduce required mixing water. The effect varies by dosage and system; trial mixes are recommended to optimize water addition.
  • Q: Is RDP safe for indoor applications?
  • A: Yes. After curing, RDP-modified mortars are non-toxic and safe for indoor use. Our products comply with relevant VOC regulations and are suitable for residential and commercial interiors.
  • Q: What happens if RDP gets wet during storage?
  • A: Moisture exposure causes irreversible agglomeration and loss of redispersibility. Always store in sealed, moisture-proof packaging in a dry environment. Inspect packaging integrity upon receipt.
  • Q: What is the minimum film formation temperature (MFFT) and why does it matter?
  • A: MFFT is the minimum temperature at which the polymer particles fuse into a continuous film. Our RDP grades have MFFT of 0–5°C, ensuring proper film formation even in cool construction environments, which is critical for adhesion development.

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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 Manufacturer Supplier and Redispersible Polymer Powder Manufacturer 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.