MULTIFLEX 620 | Polymer-Modified Thin-Set Mortar (Universal Grade / Multi-Purpose) is a multipurpose thin-set mortar that provides a permanent installation with a high bond and compressive strength and requires no soaking of the tiles. MULTIFLEX 620 is resistant to water after being cured but does not provide a waterproof barrier. Consisting of a one-component polymer/latex modified Portland cement mortar for the installation of impervious porcelain, large format tile, glass mosaics, ceramic tile, marble, granite, and all-natural and dimensional stone tile. For absorptive, semi-vitreous tiles and vitreous tiles in service of industrial, commercial, and residential use on walls and floors. It is freeze/thaw and radiant heat resistant. It provides high sag resistance for ease of installation of large format tiles.