Self-leveling mortar is a free-flowing cement-based or gypsum-based flooring material widely used for fast floor smoothing before laying tiles, vinyl flooring, wood floors and carpet. The finished floor layer requires high compressive and flexural strength, low shrinkage, crack resistance and smooth surface. Without suitable polymer additives, self-leveling mortar easily suffers surface cracking, edge curling, poor abrasion resistance and delamination from the substrate.
KINGMAX high strength RDP redispersible polymer powder is a modified VAE polymer powder customized for self-leveling floor mortar. When mixed with water, RDP rapidly re-disperses into fine polymer particles. After cement hydration and water evaporation, it forms a continuous, tough polymer film inside the mortar matrix, greatly improving mechanical strength, flexibility and dimensional stability of self-leveling mortar. Our high-strength RDP works for both cement self-leveling underlayment and gypsum self-leveling compounds.
Core Functions of High Strength RDP in Self-Leveling Mortar
1. Improve Flexural Strength & Surface Hardness
High strength RDP builds a polymer network inside the mortar, raising flexural strength and surface hardness. It prevents surface denting, scratches and wear during later construction and long-term floor service.
2. Reduce Shrinkage & Anti-Crack Performance
Self-leveling mortar is prone to drying shrinkage and curling at slab edges. The elastic polymer film formed by RDP relieves internal shrinkage stress, controls micro cracks and edge curling, maintaining a complete and flat floor layer.
3. Enhance Bonding Strength to Substrate
RDP improves adhesion between self-leveling mortar and concrete base. It avoids delamination, hollowing and peeling between the leveling layer and original floor, even under long-term walking load.
4. Optimize Flowability & Stability
Proper dosage of high strength RDP helps maintain stable fluidity without segregation. It keeps fine aggregates suspended uniformly, preventing sand settlement and surface bleeding, ensuring consistent flatness across the whole floor.
5. Boost Impact Resistance & Durability
The polymer film increases mortar toughness. The self-leveling layer can resist daily impact and load changes, extending the service life of the finished floor system.
6. Improve Water Resistance
RDP fills capillary pores, reduces water absorption of the hardened mortar, protecting the floor layer from moisture damage in wet indoor environments.
Recommended Dosage & Formulation Tips
Typical dosage of high strength RDP for self-leveling mortar: 1.8% – 3.2% by total dry weight
- Cement-based self-leveling underlayment: 2.0%–3.2%
- Gypsum self-leveling compound: 1.8%–2.8%
Formulation suggestion: Combine high strength RDP with HPMC cellulose ether. HPMC prevents rapid water loss, controls bleeding and improves construction operability. RDP delivers high strength, toughness and crack resistance. Mix all dry powder ingredients fully before adding water to avoid RDP agglomeration.
Main Application Scenarios
- Cement self-leveling underlayment for residential and commercial floor renovation
- Gypsum-based self-leveling floor compound
- Thin-layer floor repair mortar
- Self-leveling mortar for large shopping malls, offices and apartment projects
Why Choose KINGMAX High Strength RDP for Self-Leveling Mortar
- Optimized polymer formulation, balanced high strength and slight flexibility, effectively reduce shrinkage curling
- Excellent redispersibility, no lump formation during mixing
- Stable batch performance, consistent flow and mechanical test results shipment by shipment
- Good compatibility with cement, gypsum, superplasticizer and other common mortar additives
- Export-grade packaging, complete COA, TDS and MSDS documents
- Factory direct bulk supply, free test samples and professional floor mortar formula guidance
Common Floor Mortar Problems Solved by Our High Strength RDP
- Fine cracks and edge curling after self-leveling mortar drying
- Low surface hardness, easy scratching and wearing
- Delamination and hollowing between leveling layer and concrete substrate
- Aggregate segregation, sand settlement and uneven floor surface
- Insufficient impact resistance under long-term pedestrian load
Storage Guidance
Store KINGMAX high strength RDP powder in dry, cool and ventilated warehouse. Keep packaging sealed tightly. Moisture absorption will cause powder caking and reduce redispersion and film-forming performance. Use pallets to separate bags from ground.