PU Flexible Tile Adhesive (PU = Polyurethane) is a high-performance adhesive used primarily for installing tiles in areas that demand high flexibility, water resistance, and durability. Here's a detailed overview:
✅ What Is PU Flexible Tile Adhesive?
PU flexible tile adhesive is a polyurethane-based bonding agent designed for the installation of ceramic, porcelain, natural stone, glass, and mosaic tiles. Unlike cement-based adhesives, PU adhesives are pre-mixed and offer high elasticity, making them ideal for demanding or movement-prone environments.
🔧 Key Features
Feature Description
Flexibility High flexibility; absorbs structural movement and vibrations without cracking.
Water Resistance Excellent water and moisture resistance, suitable for wet areas (e.g. bathrooms, pools).
Adhesion Strength Strong bonding to a wide range of substrates (metal, wood, concrete, existing tiles, etc.).
Ready to Use Pre-mixed and requires no water or additives.
Temperature Resistant Performs well under varying temperatures (hot and cold environments).
Chemical Resistance Resistant to most household chemicals and cleaning agents.
🧱 Applications
Indoor and outdoor wall and floor tiling
Bathrooms, kitchens, and wet rooms
Swimming pools and water bodies
Over radiant heating systems
Facades or exterior cladding
Renovation jobs (tiling over tile, wood, or metal)
📦 Typical Product Composition
Polyurethane resin
Mineral fillers
Additives for flexibility and workability
Sometimes modified with silane or epoxy for added performance
🛠️ How to Apply
Surface Preparation: Clean, dry, and dust-free substrate.
Application:
Use a notched trowel to spread the adhesive evenly.
Press tiles firmly into the adhesive bed.
Open Time: Usually 30–40 minutes (check product datasheet).
Curing Time:
Light traffic: 12–24 hours
Full cure: 3–7 days
Grouting: After 12–24 hours, depending on temperature and humidity.
⚠️ Pros and Cons
✅ Pros:
Highly flexible – suitable for vibration-prone or moving substrates
Waterproof – no degradation in wet environments
Strong adhesion – good for difficult substrates
Pre-mixed – no mixing mistakes or dust
❌ Cons:
Higher cost than cementitious adhesives
Limited pot life once opened
Some have a strong odor (low-VOC versions are available)
🔍 Popular Brands
(Some examples – check local availability)
Mapei Ultrabond Eco PU 2K
SikaBond® T-8
Bostik PU Tile Adhesives
Weber PU Adhesives