HPMC for Cement-Based Waterproofing

HPMC for Cement-Based Waterproofing

Cement-based waterproofing systems require additives that enhance adhesion, flexibility, and long-term water resistance. Hydroxypropyl Methylcellulose (HPMC) is a key component in these formulations, improving workability, crack resistance, and moisture retention. Zongsheng supplies specialized HPMC grades designed for cementitious waterproofing applications, ensuring reliable performance in demanding conditions.

Key Benefits of HPMC in Cement-Based Waterproofing

1. Enhanced Water Retention

Proper hydration is critical for cement-based waterproofing membranes and coatings. HPMC slows water evaporation, allowing complete cement curing and reducing shrinkage cracks.

2. Improved Adhesion & Cohesion

HPMC strengthens the bond between waterproofing layers and substrates (concrete, masonry, or plaster). This minimizes delamination risks, even in high-moisture environments.

3. Crack Resistance & Flexibility

By reducing shrinkage stress and improving mortar plasticity, HPMC helps waterproofing layers withstand structural movement and thermal cycling.

4. Workability & Application Performance

HPMC adjusts viscosity, ensuring smooth application for brush, trowel, or spray methods. It prevents sagging on vertical surfaces while maintaining open time for adjustments.

Zongsheng’s HPMC Solutions for Waterproofing Applications

Zongsheng offers custom-formulated HPMC to meet different waterproofing needs:

• Optimal viscosity range (10,000–100,000 mPa·s) for coatings, slurries, and repair mortars.

• High water retention (≥90%) for consistent curing in dry or hot conditions.

• Compatibility with polymers (such as SBR or acrylics) for enhanced flexibility and durability.

Our HPMC is used in:

• Waterproofing membranes (cementitious coatings)

• Tile adhesives & renders with waterproofing properties

• Repair mortars for basements, bathrooms, and balconies

Technical Considerations for Formulators

• Dosage: Typically 0.1%–0.5% by weight, depending on mix design.

• Combination with other additives: Redispersible polymer powders (RDP) improve elasticity.

• pH stability: Performs well in highly alkaline cement environments.

HPMC is a critical additive for cement-based waterproofing, improving adhesion, crack resistance, and workability. Zongsheng provides tailored HPMC solutions for waterproofing formulators, ensuring long-lasting protection against water infiltration.

For technical specifications or formulation support, contact Zongsheng to discuss your requirements.