The 1 Flex Crack-Isolation Mortar is both a one-step, crack-isolation system and a fast-setting mortar with a high-performance bond. It is a single-component modified polymer mortar that acts as a tile setting mortar and 1/8-inch crack-isolating technology. By combining a blend of exclusive acrylic spray dried polymers and hydraulic cement in a non-staining white formulation, it provides a bond with most ceramic and natural stone tile. It also carries a heavy-duty commercial floor rating.