Static mixer with monolithic mixing elements providing an increased resistance force during mixing

A static mixer for viscous media which comprises a tube and at least one mixing element arranged in the tube, the tube defining a main flow direction of the fluid to be mixed and the mixing element being formed as a monolithic structure with bars crossing and interengaging one another, at various crossing points the bars each having an essentially rectangular cross section with a large and a small side, wherein the crossing points of the bars are reinforced by local thickened portions thereby defining a common boundary surface between the bars which lies parallel to the main flow direction, the common boundary surface being at least approximately twice as large as the square area formed by the small side.