4-XLT is a multi-use, polymer fortified adhesive mortar. 4-XLT offers tremendous utility including non-sag wall installations, large heavy tile mortar build-up of up to 3/4" (19 mm) and thin-set applications. For floor and wall installations of interior and exterior ceramic tile, porcelain tile and stone. Ideal for most thin-set applications. Smooth and Creamy consistency. Exceeds ANSI A118.15, A118.4, and 118.11 Shear Bond Strength Requirements. Exceeds ISO 12004 - C2TES2 classification.