Standard, Extra Smooth, Large-and-Heavy-Tile Mortar with Polymer Keraflex SG is a standard-grade, versatile, large-and-heavy-tile mortar and thin-set mortar for tile and stone installations on floors, walls and countertops. It is formulated as non-sag for walls and nonslump for floors. Keraflex SG is a polymer-modified mortar formulated with Easy Glide Technology™ for ease of application and offers good adhesion to substrates and tile. It can also be used as a mortar over uncoupling, crack-isolation, sound-reduction and waterproofing membranes.