Hydroxypropyl Methylcellulose (HPMC) for Mortar & Tile Adhesive
CAS Number: 9004-65-3
Hydroxypropyl methylcellulose (HPMC) is a non-ionic cellulose ether widely used as a water retention agent, thickener, and workability improver in dry-mix mortar and tile adhesive formulations. It dramatically reduces water loss to porous substrates, ensuring adequate cement hydration and improving bond strength. HPMC also imparts anti-sag, open time, and smooth application properties critical in tile and plaster applications.
Technical Specifications
| appearance | White to off-white powder |
| pH (2% solution) | 6.0-8.0 |
| methoxyl content (%) | 19–24 |
| moisture content (%) | ≤5 |
| viscosity (2%, 20°C, mPa·s) | 40000–200000 (customizable) |
Applications
- Tile adhesives and thin-bed tile setting mortars
- Exterior insulation compound system (ETICS) adhesive and base coat
- Interior and exterior plasters and renders
- Self-leveling floor underlayments
- Cementitious tile grout and joint fillers
Key Features
- High water retention (>95%) ensures full cement hydration on porous substrates
- Adjustable viscosity grades for a wide range of mortar applications
- Provides excellent sag resistance and smooth workability
- Thermally gelling: thickens on heating to prevent slump at elevated temperatures
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