A static mixer for mixing a multi-component material (M, M'), the static mixer comprising: a plurality of mixing segments (12, 12') arranged in series one after another along a longitudinal axis of the static mixer; wherein at least some of the plurality of mixing segments (12, 12') comprise at least three elongate inlets arranged at least substantially in parallel to one another and at least three elongate outlets arranged at least substantially in parallel to one another, with a respective elongate inlet being connected to a respective elongate outlet via a respective passage, wherein the elongate outlets are arranged such that an elongate extent thereof is rotated by an angle of rotation of at least 45°about the longitudinal axis with respect to an elongate extent of the elongate inlets; wherein the elongate outlets of one mixing segment (12, 12') are arranged next to the elongate inlets of the next mixing segment (12, 12') of the series; wherein the respective passages are configured to form flow paths that direct a part flow of the multi-component material (M, M') from the elongate inlet to the elongate outlet of the mixing segment (12, 12'); and wherein at least some of the passages of the mixing segment (12, 12') comprise at least one deflector plate (26, 26') arranged in the flow path in a region of the elongate inlet and/or in a region of the elongate outlet, wherein the plurality of mixing segments (12, 12') is formed from a plastic characterized in that at least some of the passages of the mixing segment (12, 12') comprise at least one deflector plate (26, 26') arranged in a central part of said passage in a region of the elongate inlet and/or in a region of the elongate outlet. a plurality of mixing segments (12, 12') arranged in series one after another along a longitudinal axis of the static mixer; wherein at least some of the plurality of mixing segments (12, 12') comprise at least three elongate inlets arranged at least substantially in parallel to one another and at least three elongate outlets arranged at least substantially in parallel to one another, with a respective elongate inlet being connected to a respective elongate outlet via a respective passage, wherein the elongate outlets are arranged such that an elongate extent thereof is rotated by an angle of rotation of at least 45°about the longitudinal axis with respect to an elongate extent of the elongate inlets; wherein the elongate outlets of one mixing segment (12, 12') are arranged next to the elongate inlets of the next mixing segment (12, 12') of the series; wherein the respective passages are configured to form flow paths that direct a part flow of the multi-component material (M, M') from the elongate inlet to the elongate outlet of the mixing segment (12, 12'); and wherein at least some of the passages of the mixing segment (12, 12') comprise at least one deflector plate (26, 26') arranged in the flow path in a region of the elongate inlet and/or in a region of the elongate outlet, wherein the plurality of mixing segments (12, 12') is formed from a plastic characterized in that at least some of the passages of the mixing segment (12, 12') comprise at least one deflector plate (26, 26') arranged in a central part of said passage in a region of the elongate inlet and/or in a region of the elongate outlet.