RDP – Redispersible Polymer Powder

RDP (Redispersible Polymer Powder) is a free-flowing, water-redispersible polymer powder used as a binder, adhesion promoter, flexibility modifier and film-forming polymer in a wide range of dry-mix and water-based formulations.
When mixed with water, RDP redisperse to form a polymer dispersion. During drying, the polymer particles coalesce and form a continuous or semi-continuous polymer film, helping improve adhesion, flexibility, cohesion, water resistance and durability of the formulated material.
Product Overview
RDP is manufactured by spray-drying a polymer dispersion together with protective colloids and other formulation components. Depending on the polymer chemistry, RDP grades can provide different combinations of:
Adhesion
Flexibility
Elasticity
Water resistance
Hydrophobicity
Cohesion
Abrasion resistance
Film formation
Workability
Common RDP chemistries include VAE (Vinyl Acetate-Ethylene) and other vinyl/polymer systems. Therefore, the exact properties should always be confirmed from the specific grade’s TDS.
Main Functions of RDP
1. Binder
Helps bind mineral and other powder particles together after water addition and drying.
2. Adhesion Promoter
Improves bonding between the formulated material and different substrates.
3. Flexibility Modifier
Provides greater flexibility to otherwise rigid cementitious or mineral-based systems.
4. Film Former
Forms a polymer film during drying, contributing to cohesion and resistance properties.
5. Water-Resistance Modifier
Can reduce water penetration and improve resistance to moisture, depending on the polymer grade and formulation.
6. Cohesion Improver
Improves internal bonding and reduces powdery or weak surface characteristics.
Major Application Areas
🏗️ 1. Construction & Building Materials
RDP is extensively used in polymer-modified dry-mix products.
Tile Adhesive
Ceramic tile adhesive
Porcelain tile adhesive
Wall and floor tile adhesive
Flexible tile adhesive
Improved adhesion formulations
Wall Putty & Skim Coat
RDP can improve:
Adhesion
Surface cohesion
Crack resistance
Workability
Durability
Repair Mortar
Used to improve bonding and flexibility in cement-based repair materials.
Waterproofing Mortar
Can improve flexibility, adhesion and resistance to water penetration when properly formulated.
Self-Leveling Compounds
Used as a polymer modifier to improve adhesion, cohesion and surface performance.
Grout
Can be used in cementitious grout formulations where improved adhesion and flexibility are required.
Plaster & Render
Useful in polymer-modified cement and mineral-based plaster systems.
🧱 2. Insulation Systems
RDP is used in formulations for thermal insulation systems such as:
EPS insulation-board adhesive
Mineral wool-related dry-mix systems
External thermal insulation systems
Insulation rendering compounds
Base-coat formulations
It can improve adhesion between insulation boards and the substrate while contributing to flexibility and cohesion.
🎨 3. Coatings
Depending on polymer grade and formulation, RDP can be used in:
Cementitious coatings
Polymer-modified mineral coatings
Decorative dry-mix coatings
Protective mineral coatings
Waterproof coating powders
Surface finishing systems
It can contribute to adhesion, film formation, flexibility and water resistance.
🧪 4. Industrial Dry-Mix Formulations
RDP can be used wherever a water-redispersible polymer binder is required.
Potential applications include:
Polymer-modified powders
Dry adhesive systems
Mineral-based bonding compounds
Repair compounds
Surface treatment powders
Industrial dry-mix formulations
The suitability depends on the polymer chemistry and the other ingredients used in the formulation.
🧴 5. Adhesive Applications
RDP can function as a polymer binder/modifier in selected powder adhesive systems.
Applications may include:
Dry-mix adhesives
Mineral-based adhesives
Insulation adhesives
Cementitious bonding products
Powder-based bonding systems
Important: RDP is not a universal replacement for liquid PVAc, EVA emulsion, acrylic emulsion or other liquid adhesives. The appropriate polymer grade must match the application.
🏭 6. Flooring Applications
RDP can be used in:
Self-leveling compounds
Cement-based floor toppings
Floor repair compounds
Underlayment materials
Polymer-modified flooring systems
It can contribute to adhesion, flexibility, abrasion resistance and surface cohesion.
🏠 7. Decorative & Architectural Materials
Possible applications include:
Decorative wall finishes
Textured coatings
Mineral decorative mortars
Polymer-modified render
Decorative cementitious products
⚙️ Key Performance Benefits
Property
Effect of RDP
Adhesion
↑ Improved
Flexibility
↑ Improved
Cohesion
↑ Improved
Crack resistance
↑ Improved
Water resistance
↑ Can improve
Workability
↑ Can improve
Abrasion resistance
↑ Can improve
Durability
↑ Can improve
Film formation
Polymer-dependent
Hydrophobicity
Grade-dependent
Actual performance depends on RDP grade, dosage, polymer chemistry, substrate and formulation.