A static mixing element ( 10 ) for mixing free-flowing compounds such as multi-component injection mortar, includes a first shell part ( 11 ) and a second shell part ( 12 ) which can be placed againstone another in an axial longitudinal direction ( 13 ) at their respective sealing edges ( 14, 15 ) and are connected to one another by a connection element ( 30 ). Flow-directing elements ( 20 ) arearranged in a flow-through chamber ( 16 ) that is defined between the two shell parts ( 11, 12 ) and which extends from an inlet opening ( 17 ) to an outlet opening ( 18 ). These flow-directing elements ( 20 ) are formed as vane elements ( 21, 22 ) which project out over the sealing edges ( 14, 15 ) of one of the shell parts ( 11, 12 ) and leave open a portion ( 35 ) of the flow-through chamber (16 ) at a sealing edge ( 14, 15 ) of another of the shell parts ( 11, 12 ).