MORTAR MEDIUM BED WHITE 50LB Specifications: Compositions: Crystalline Silica Quartz Portland Cement Slag Calcium Carbonate Gypsum A premium quality polymer-modified mortar for any size natural stone or large format ceramic or porcelain tile 15 in (38 cm) or larger on one or more sides clay pavers or other thin or medium bed applications. With a non-slumping formula that reduces the chance for lippage and promotes level tile installations CUSTOM s natural stone & large tile mortar can be applied for horizontal applications as thick as 3/4 in (19 mm) or for thin bed applications to 1/4 in (6 mm).