Polymer Modified Grout (PMG) is a type of grout that contains polymer additives to improve its properties compared to conventional cement-based grout. These polymers can be in the form of liquid latex or redispersible powders. PMG is commonly used in tile installations, especially in areas requiring enhanced performance such as high-traffic zones, wet areas, or exterior applications.
Polymer modified grout typically contains:
Portland cement: The main binding material.
Sand or other fillers: To add volume and strength.
Polymers: Latex (e.g., acrylic, styrene-butadiene) or redispersible polymer powders.
Additives: Such as water-retention agents, colorants, and antifungal agents.
Key Features and Benefits
Feature Benefit
Improved Flexibility Better resistance to cracking and movement (important for substrates like wood or exterior installations).
Reduced Water Absorption More resistant to staining, mold, and mildew. Suitable for wet areas like showers or swimming pools.
Higher Bond Strength Better adhesion to tile edges and substrate.
Color Retention More uniform and long-lasting color.
Durability Withstands thermal and mechanical stresses better than unmodified grout.
Shrinkage Control Lower shrinkage during curing helps prevent cracks and gaps.
Applications
Bathrooms and kitchens
Wet rooms and shower enclosures
Commercial kitchens and swimming pools
Exterior cladding or paving
Underfloor heating installations