The AMX 400 Series is a factory blend of Portland cement, hydrated lime and dried sand. The AMX 400 Series is specially formulated to provide high water retention, exceptional workability and superior bond strength. Available in types N, S and M.  Uses includes: Interior or exterior applications, above or below grade, (Type N - Above grade only), Laying or resetting brick, block and stone, and for load and non-load bearing construction.