Polymer Modified Grout (PMG) is a type of cementitious grout that is enhanced with polymer additives (typically latex-based or redispersible polymer powders) to improve its performance characteristics. It's widely used in tile installation, stone setting, and other construction applications that require enhanced bond strength, flexibility, and water resistance.
🔧 Composition of Polymer Modified Grout
Cement – Portland cement acts as the primary binder.
Sand or Fine Aggregates – Provides body and structure.
Polymers – Latex or redispersible polymer powders (e.g., acrylics, SBR, vinyl acetate).
Additives – To improve workability, reduce shrinkage, and control setting time.
Pigments – For colored grout, if needed.
✅ Key Properties & Advantages
Property Description
Increased Flexibility Can accommodate slight substrate movement without cracking.
Improved Adhesion Stronger bond to tile edges and substrates.
Reduced Water Absorption Better water resistance, ideal for wet areas like bathrooms or kitchens.
Stain Resistance Lower porosity reduces susceptibility to staining.
Shrinkage Control Reduces cracking and powdering.
Improved Durability Resistant to wear, abrasion, and freeze-thaw cycles.
🔨 Applications
Ceramic and porcelain tile installations
Natural stone setting (marble, granite)
Wet areas like bathrooms, kitchens, pools
Exterior and interior use
High-traffic commercial flooring
🔄 Types of Polymer Modified Grout
Sanded Polymer Modified Grout
Contains sand; used for wider joints (1/8" to 1/2")
More durable and crack-resistant
Unsanded Polymer Modified Grout
No sand; for narrow joints (<1/8")
Ideal for polished or delicate tiles
🛠️ Installation Guidelines
Surface Prep: Ensure tiles are clean, dry, and properly spaced.
Mixing: Add water (or liquid polymer if required) to the dry grout mix as per manufacturer instructions.
Application: Use a rubber float to press grout into joints at a 45° angle.
Cleaning: Wipe excess grout with a damp sponge after initial set.
Curing: Allow proper curing time (typically 24 hours) before exposure
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