Description
USM Masons Mix Type O is a mixture of masonry sand, type S lime and Portland cement blended to meet ASTM C-270 specifications for type O mortar.  Type O Masons Mix displays superior plasticity and bond properties which allow the joint to be tooled easily and efficiently.  Type O mortars are typically used in structural rehabilitation projects where old and new mortar with similar properties must be used. 

Uses
USM Masons Mix Type O is typically used by the mason who is working on a pre-depression era building that needs rehabilitation work on the mortar joints and masonry system itself.  It is very important during these historic structural preservation projects to match the high lime content mortars used prior to the depression.  Using similar mortars in tuckpointing or wall rehabiliation is essential for proper bond and consistent tensile strength throughout the masonry wall. 

Benefits

• Outstanding workability - smooth spreading ability lends itself to a quality finish. 
• High bond strength - integral lime penetrates masonry unit to crystallize and lock mortar units together. 
• Mortar board life - lime allows for an extended board life.
• Consistency - Pre-blended concept eliminates jobsite problems of inconsistent mortar batches.