Redispersible Polymer Powder (RDP) is a powdered thermoplastic resin produced by spray-drying polymer emulsions. The product appears as a white or off-white free-flowing powder that can redisperse in water to form a stable polymer emulsion, restoring properties similar to the original emulsion.
The main types of redispersible polymer powder include vinyl acetate-ethylene copolymer, vinyl acetate-vinyl ester of versatic acid copolymer, and acrylic copolymer.
| Parameter | Typical Range | Notes |
|---|---|---|
| Appearance | White or off-white powder | —— |
| Solid Content | ≥98% | Proportion of active ingredients |
| Ash Content | 10%–15% | Inorganic filler content |
| Bulk Density | 400–550 g/L | —— |
| Particle Size | 80–120 μm | —— |
| Viscosity (10% Solution) | 200–800 mPa·s | Varies by grade |
| pH Value | 4.5–8.0 | —— |
Note: The above data represent typical specifications. Values may vary by grade or batch. Please refer to the product test report for specific parameters.
Redispersible polymer powder can improve the adhesion between mortar and various substrates. For surfaces that are difficult to bond, such as tiles, polystyrene boards, and wood, the addition of polymer powder forms polymer bridges that enhance adhesion. For products used in tile adhesives, the tensile bond strength typically reaches ≥1.0 MPa.
The polymer film formed by the powder in mortar improves the flexibility and crack resistance of the material. Powders with lower glass transition temperatures offer better flexibility, making them suitable for applications with significant temperature variations, such as external thermal insulation systems.
Redispersible polymer powders based on vinyl chloride or vinyl acetate-ethylene copolymer exhibit good water resistance, enhancing the hydrophobicity and impermeability of mortars. They are suitable for waterproofing mortars, tile grouts, and other applications in damp environments.
The powder enhances the water retention and lubricity of mortar, improving the smoothness of troweling and application, and extending open time.
Quality redispersible polymer powder can completely disperse within minutes after contact with water, with no obvious clumping or sedimentation. This is a core performance indicator for ensuring uniform mixing of building materials.
Redispersible polymer powder is a core additive in tile adhesive formulations, improving the bond strength between tiles and substrates and enhancing slip resistance.
In insulation board adhesive mortars and basecoat mortars, the powder provides flexibility and adhesion to accommodate thermal expansion and contraction caused by temperature variations.
The addition of polymer powder to interior and exterior wall putties improves flexibility and adhesion.
The powder improves the flowability and surface strength of self-leveling mortars while enhancing adhesion to the substrate.
Water-resistant grades of the powder are suitable for waterproofing mortars and moisture protection systems, providing hydrophobicity and dense film formation for applications in basements, bathrooms, and roofs.
Recommended dosages vary by mortar type:
Tile Adhesives: Typically 1.0%–3.0% of cementitious material mass
External Insulation Basecoat Mortars: 2.0%–4.0%
Putty Powders: 1.0%–2.0%
Specific dosages should be determined through trials based on mortar type, performance requirements, and construction conditions.
It is recommended to pre-mix the polymer powder with other dry powder materials uniformly before adding water in the mixing equipment to ensure even dispersion.
The product should be stored in sealed containers in a cool, dry place, protected from moisture and high temperatures. The recommended shelf life is six months. Once the bag is opened, it should be used as soon as possible to prevent moisture absorption and caking.
General-Purpose Grades: Suitable for putty powders, general mortars, tile adhesives, and other standard applications
Water-Resistant Grades: Suitable for waterproofing mortars and exterior systems requiring water resistance
Specialty Grades: Including quick-setting and high-temperature-resistant types for specific working conditions
When selecting redispersible polymer powder products, consider the following aspects:
1. Solid Content
Quality polymer powders typically have a solid content ≥98%. Products with solid content below 95% may have insufficient active ingredients.
2. Ash Content
Ash content reflects product purity. Quality products typically have an ash content of 10%–15%. Excessively high ash content indicates excessive filler addition.
3. Redispersibility
Dissolve a small sample in water. Quality products disperse quickly into a uniform emulsion with no obvious sedimentation or clumping.
4. Minimum Film-Forming Temperature
For winter construction in northern regions, products with a minimum film-forming temperature ≤0°C are recommended. For indoor construction at room temperature, standard grades of 0–5°C may be selected.
5. Bond Strength
For products used in tile adhesives, the tensile bond strength typically reaches ≥1.0 MPa under standard conditions.
6. Supplier Qualifications
Choose suppliers that can provide product test reports, stable supply capability, and technical support.
Shenyang Xingzhenghe Chemical Co., Ltd. (www.xzhch.com) is a supplier specializing in concrete admixtures and construction chemical raw materials, established in 2009. The company's product range includes redispersible polymer powder, polycarboxylate superplasticizers, sodium gluconate, lignosulfonate series, and Hydroxypropyl Methyl Cellulose.
The company has experience in the supply of redispersible polymer powder products, serving applications including tile adhesives, putty powders, insulation mortars, and waterproofing mortars, with distribution across domestic regions and international markets.
Redispersible polymer powder, as a commonly used polymer modifier in dry-mix mortars and building materials, provides value in improving bond strength, enhancing flexibility, increasing water resistance, and optimizing workability. When selecting redispersible polymer powder products, factors such as solid content, ash content, redispersibility, minimum film-forming temperature, and supplier capabilities may be considered.
Shenyang Xingzhenghe Chemical Co., Ltd. is committed to providing redispersible polymer powder and related construction chemical raw material solutions to its customers.
Contact Us:
Company: Shenyang Xingzhenghe Chemical Co., Ltd.
Website: www.xzhch.com
Phone: +86 13889850231
Email: sales01@xzhch.com
Address: No. 33, Nan'er Road, Heping District, Shenyang, China
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Redispersible Polymer Powder: A Core Additive for Dry-Mix Mortar Performance
Technical Analysis of Redispersible Polymer Powder (RDP)
