This KeraFlex Maxi Tile Adhesive by Mapei is an S1 adhesive suitable for use on walls and floors. It has low dust technology and very low emissions of volatile organic compounds. Available in white and grey, this adhesive is especially suited for fixing larger-size porcelain and natural stone tiles with an extended open time of over 30 minutes and 60 minutes working time. Its flexible formula offers no vertical slip when tiling on walls.