A universal, silver-grey, multi-purpose, high-coverage, extra-rapid-set, highly polymer-modified, cementitious flexible tile adhesive with Rhenish trass. For installation of ceramic coverings and discoloration-sensitive natural stone tiles on all substrates. With high crystalline water-binding capacity. For large-format fully vitrified stoneware wall and floor coverings. Low-chromate to Regulation (EC) No 1907/2006, Annex XVII.