AcryFlex 2K ExtraStrong is a two component, crack-bridging, flexible sealing slurry with an excellent bonding to mineral surfaces. After setting, the sealing slurry is completely watertight and permeable to vapour diffusion, impermeable to chlorides as well as resistant to frost and ageing. Safe even in case of subsequent tension cracks. AcryFlex 2K ExtraStrong is a cementitious membrane which can also be used for waterproofing of junctions like joints and fillets as a part of the Crystalline system.