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Functions of RDP for Improving Mortars

Oct. 19, 2021


Redispersible polymer powder (RDP) is made from polymer emulsions by a spray drying process. After mixing with water in the mortar, the polymer emulsion emulsifies and disperses, becoming more stable. RDP emulsifies and disperses in water, and when the water evaporates, a polymer film is formed, which can improve the properties of the mortar. Different RDPs have different effects on the properties of the dry mortar.


RDP in bags and Beakers


Improved workability

The polymer powder particles in the mortar have a lubricating effect on each other, which allows the mortar components to flow separately, and the polymer powder has an inducing effect on the air, causing the mortar to be compressed and improving workability and ease.


Reduces water absorption

RDP can form a film in the mortar cavity and on the surface. The film will not redisperse in water, preventing water intrusion and improving the mortar's impermeability. Mortars with special hydrophobic RDP will have better hydrophobicity. We have RDP powder for waterproof mortar for sale.


Improving mortar properties

RDP fills the mortar cavity, increasing the density of the mortar and improving the abrasion resistance of the mortar. The mortar relaxes under external forces to avoid being damaged. The polymer film can be permanently present in the mortar system.


Increased cohesion

RDP as organic binder, after the formation of polymer film in the mortar, has a high tensile strength and bond strength on different substrates, and plays an important role in the bonding ability of the mortar with organic materials or smooth surface substrates. The film-forming polymer powder is distributed throughout the mortar system as a reinforcing material to enhance the cohesion of the mortar.


RDP application


Preventing cracking

RDP is a thermoplastic resin with good flexibility, enabling the mortar to adapt to changes in the external hot and cold environment, effectively preventing the mortar from cracking due to temperature changes.



RDP can be used in internal and external wall putties to ensure that the putty has a certain degree of flexibility to cushion the different tensile stresses generated by different substrates. The putty is guaranteed to have good resistance to ageing, seepage and moisture. It can also be used as a tile adhesive to provide a high strength bond and high flexibility for mortars to adapt to the different thermal expansion coefficients of substrates and tiles.



LISTAL is dedicated to researching the properties and applications of dispersible polymer powders and has developed different products for various applications. Please contact us for more information, our professional technicians work hard to solve problems for our customers and ensure product quality and application results. 


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