RDP JINT Series Selection Guide for Mortar Projects: Key Criteria & Practical Application Tips.

When selecting Redispersible Polymer Powder (RDP) for mortar projects, choosing the right RDP is pivotal to the mortar's final performance, durability, & long-term stability. 

As a core functional additive, RDP JINT series significantly enhances mortar flexibility, improves substrate adhesion, boosts water resistance, and extends service life. 

For engineering technicians and project managers, mastering scientific RDP JINT series selection methods is essential to ensuring project quality, controlling costs, and avoiding post-maintenance risks. 

This guide integrates professional technical points with practical project needs, elaborating on the core criteria and skills of RDP selection to help practitioners make accurate choices.

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1. Core Performance Indicators for RDP JINT Series Selection

The performance of RDP JINT series is the foundation of mortar project quality. 

When evaluating products, focus on five core indicators and comprehensively assess them against project requirements:

1.1 Elasticity & Deformation Resistance

This determines the mortar's ability to adapt to subtle structural changes caused by temperature fluctuations, foundation settlement, or external forces. 

For exterior rendering & old building repair projects prone to deformation, 

select RDP JINT series with moderate tackiness and excellent recovery performance,

such as the low-Tg : RDP JINT-745 which effectively adapts to minor deformations of the original structure and ensures long-term bonding stability.

1.2 Tensile Strength

Tensile strength guarantees the mortar's structural integrity under external stress. 

For high-load projects like floor screeding, strictly verify that the RDP JINT series meets national 

and industry standards to avoid using substandard products that may damage the mortar layer.

1.3 Film-Forming Properties

The film-forming ability of RDP JINT series directly affects mortar water resistance and adhesion. 

After curing, RDP JINT particles form a uniform, dense polymer film that fills gaps and blocks water penetration. 

When selecting, focus on film uniformity, density, and speed, and consider compatibility with ambient temperature and humidity. 

For example, choose fast-film-forming products for high-humidity southern China and low-temperature film-forming products for cold northern winters.

1.4 Water Resistance

Critical for moisture-exposed projects (bathrooms, basements, exterior walls), excellent water resistance prevents mortar strength loss, 

efflorescence, and steel corrosion. Verify water resistance via third-party certifications or on-site tests. 

For tile adhesive, select RDP JINT series with a 24-hour water absorption rate below 5%, 

such as RDP JINT-503 could be used as normal specification. RDP JINT-740 could ensure long-term water resistance and avoid tile detachment.

1.5 Adhesion Strength

Adhesion strength ensures firm bonding between mortar and substrates (concrete, masonry, tiles). 

Choose products based on substrate properties: strong penetration and adhesion for smooth concrete, 

and good wettability for porous masonry. 

2. Compatibility of RDP JINT Series with Mortar Components

RDP JINT series must be compatible with cement, aggregates, fillers, and other additives to avoid reduced strength, 

shortened setting time, cracking, or premature failure. 

Conduct compatibility tests beforehand: mix components per the project's mortar formula, prepare samples, 

and test workability, mechanical properties, and durability. 

If performance is unsatisfactory, replace the RDP JINT series or adjust the formula. Also, test compatibility with water reducers and retarders.

For example, some polycarboxylate water reducers may react with specific RDP JINT products, reducing effectiveness.

3. Project-Specific RDP JINT Series Selection

Notes: C1/C2 = tensile adhesion classes (C2 > C1); D1/D2 = flexibility classes (D2 > D1). 

              Higher TG = greater rigidity; lower TG = better flexibility.

- Tile Adhesive: Choose C1-class RDP JINT-502/503 for residential interiors; C2-class RDP JINT-740 for commercial/high-rise exteriors. Consider thixotropy for large/heavy tiles.

- Exterior Rendering: Select VAE-based RDP JINT-502 for UV and temperature resistance; test weatherability for high-humidity/rainy areas.

- Self-Leveling Mortar: Opt for moderate-TG (10-15℃) products to improve workability and crack resistance; ensure compatibility with water reducers.

- Repair Mortar: Use low-Tg RDP JINT-745 for flexibility and adhesion; choose corrosion-resistant products for coastal areas.

4. Climate & Thermal Stability Considerations

Select RDP JINT series adaptable to local climate. 

For large temperature differences (northern China), choose products with a wide adaptation range (e.g., RDP JINT-502, -20℃ to 60℃). 

For high-humidity areas (southern China), prioritize water-resistant and mold-resistant products. 

For coastal areas, select corrosion-resistant options. 

Verify thermal stability via thermal cycling tests to ensure performance consistency across temperatures.

5. Manufacturer Quality & Standard Compliance

Prioritize manufacturers with transparent Technical Data Sheets (TDS) detailing composition, performance, and application guidelines. 

Ensure TG values match project rigidity/flexibility needs. 

Reliable manufacturers also provide after-sales technical support, helping resolve on-site application issues.

Conclusion

Selecting RDP JINT series requires balancing performance indicators, project needs, component compatibility, climate adaptability, and manufacturer credibility. 

By following the criteria outlined in this guide, you can ensure mortar durability and project success, making informed choices of RDP JINT series for various mortar applications.

By: Melody.lee

Email: melody.lee@jtdf-rdp.com

Moblie:+86 186 6375 9818

Whatsapp:+86 187 6398 8189