ARDEX X 51 is an economical rubber modified adhesive for fixing ceramic tiles in internal and external (with satisfactory falls) situations. It can be used over render, plasterboard, fibre-cement sheet and concrete in situations where minimal movement is anticipated. When mixed with water, a flexible mortar that meets the S 1 tile adhesive classification is produced. ARDEX X 51 is ideal for fixing ceramic, fully vitrified, porcelain, non-moisture sensitive natural stone tiles and mosaics. ARDEX X 51 can be used in residential and commercial applications with satisfactory falls.