Redispersible Polymer Powder (RDP) in Mortar: Performance Enhancement for Dry Mix Mortar

Redispersible Polymer Powder (RDP) is a pivotal additive for dry mix mortar.

It redefines mortar's properties by forming an inorganic-organic binder structure in cured mixes. 

Among various RDP products, JINT Redispersible polymer powder is a high-performance vinyl acetate ethylene co-polymer (VAE copolymer), 

a water-soluble polymer manufactured via spray drying of VAE emulsion. 

It is widely applied in dry mix mortar products, 

including tile adhesive, tile grout, brick laying mortar, self-leveling compounds, skim coat, EIFS, plaster and renders. 

This system blends a rigid cement-based skeleton with a flexible polymer network 

(from redispersed latex film on pore walls/solid surfaces), drastically boosting workability, 

durability & physical performance of polymer mortars like waterproof mortar & repair mortar.

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Core Mechanism of RDP in Mortar

In the alkaline cement hydration environment, RDP's hydrophilic protective colloid (e.g., PVA) saponifies & separates, 

letting the redispersible polymer powder form a continuous, water-insoluble film. 

This film performs reliably in dry conditions and long-term water immersion,ideal for waterproof mortar, 

exterior wall mortar and other outdoor applications. 

For non-alkaline mixes (e.g., gypsum-based skim coat), RDP still works effectively for applications not involving prolonged 

water exposure, though residual PVA may slightly reduce water resistance.

Key Performance Improvements of RDP (With Target Application Links):

1. Bond Strength for Tile Adhesive & EIFS

RDP elevates adhesion between dry mix mortar & various substrates (tiles, EPS boards for EIFS) by forming interface bridging structures,

healing shrinkage microcracks to preserve long-term bond integrity. 

This makes it non-negotiable for high-performance tile adhesive, tile grout and Exterior Insulation & Finish Systems (EIFS), 

ensuring stable bonding even in temperature-fluctuating environments.

2. Flexibility & Crack Resistance for Self-Leveling Mortar

The flexible polymer film (softer than rigid cement matrices) boosts polymer mortar's deformability & stress dispersion, 

significantly enhancing flexibility & reducing cracking risks. This is critical for self-leveling compounds, repair mortar, 

& waterproof mortar (where crack prevention is directly related to waterproofing effectiveness), 

as well as plaster and renders used in exterior walls.

3. Impact/Abrasion Resistance for Industrial Floors

Interwoven polymer regions in polymer mortar block micro-crack propagation, 

effectively lifting impact resistance and abrasion resistance perfect for industrial floor screeds, wear-resistant coatings 

and brick laying mortar in high-traffic industrial and commercial spaces, prolonging the service life of floor and wall structures.

4. Water Resistance & Durability for Damp Environments

RDP's latex film densifies polymer mortar's microstructure (lining pore walls) to reduce water ingress, 

drastically boostingwater resistance, freeze-thaw resistance & overall durability. 

This extends the lifespan of wall putty,waterproof mortar, exterior wall mortar, 

and tile grout used in damp or outdoor environments, reducing maintenance costs.

5. Workability & Shrinkage Control for Self-Leveling Mortar

RDP enhances workability and cohesion of dry mix mortar, simplifying on-site application and improving 

construction efficiency while effectively reducing drying shrinkage and shrinkage cracking. 

These benefits are foundational for self-leveling compounds, skim coat, plaster and renders, 

and repair mortar, ensuring smooth construction and high-quality finished surfaces.

Conclusion

Redispersible polymer powder (RDP)  (or RD powder) transforms traditional mortar from brittle to ductile: 

as RDP dosage rises, dry mix mortar takes on elastomer-like properties (with cement hydrates as "fillers"). 

Particularly, JINT Redispersible polymer powder as a high-quality VAE copolymer variant, 

becomes an indispensable modifier for modernpolymer modified mortar products,

including tile adhesive, self-leveling compounds, waterproof mortar, tile grout, and repair mortar,

delivering superior performance, prolonged longevity, and reliable stability across diverse construction scenarios.

Package:

25kgs / bag with PP or PE inner

20'GP: 14tons with pallets or 16tons without pallets

40'HC: 28tons with pallets Max. 

BY: Melody Lee

Email: melody.lee@jtdf-rdp.com

Mobile: +86 186 6375 9818

Whataspp: +86 187 6398 8189