Rapid-Setting Performance for Faster Project Turnaround

MAPEI Keraflex RS is a professional-grade, rapid-setting mortar engineered for efficient tile and stone installations. Designed for both large-and-heavy tile and standard thin-set applications, it allows grouting in as little as 3 to 4 hours after installation.

This fast-setting capability helps contractors accelerate project timelines, reduce downtime and move quickly to the next phase of construction without sacrificing bond strength or performance.

Extra Smooth and Creamy for Effortless Application

Formulated with Easy Glide Technology™, Keraflex RS offers an extra smooth, creamy consistency that makes troweling easier and more controlled. Its workability supports consistent ridge formation and strong adhesive transfer to the back of the tile.

Application advantages include:

• Easy spreading and reduced drag

• Ideal for edge-leveling clip systems

• Improved coverage and tile contact

• Clean, professional results on floors and walls

The smooth handling characteristics make it a reliable choice for precision installations.

Nonsag and Nonslump Stability for Large and Heavy Tile

Keraflex RS is engineered as a nonsag mortar for vertical applications and nonslump for floors, providing excellent support for large-format and heavy tile or stone. Tiles remain securely in place after setting, minimizing movement and reducing adjustment time.

Ideal for:

• Large-format porcelain tile

• Natural stone installations

• Floor, wall and countertop applications

• Bond coats up to 1/2" (12 mm) in embedded thickness

This stability ensures proper alignment and long-lasting installation performance.

Superior Bonding with High-Transfer Technology

With High-Transfer Technology, Keraflex RS delivers exceptional mortar-wetting properties for enhanced adhesion to both substrate and tile. The polymer-enriched formulation improves flexibility and bond strength across a wide range of approved surfaces.

Suitable for installation over:

• Concrete and cement backer units

• Exterior-grade plywood (per industry standards)

• Uncoupling membranes

• Crack-isolation membranes

• Sound-reduction and waterproofing membranes

This versatility makes it an excellent solution for complex or layered flooring systems.

Professional-Grade Versatility for Demanding Installations

Keraflex RS combines rapid setting, smooth handling and high bond strength in one advanced mortar. Whether used for time-sensitive commercial projects or high-end residential installations, it provides dependable performance across floors, walls and countertops.

For installers seeking a fast-setting, extra smooth, polymer-modified mortar that supports large-and-heavy tile while maintaining excellent adhesion, MAPEI Keraflex RS delivers a high-performance, jobsite-ready solution.