Spacer for insulating glazing units, at least comprising - a polymeric hollow profile, comprising - a first side wall (2.1) and a second side wall (2.2) arranged parallel thereto, - a glazing interior wall, which connects the side walls (2.1, 2.2) to one another; - an outer wall, which is arranged substantially parallel to the glazing interior wall and connects the side walls (2.1, 2.2) to one another; - a hollow space, which is enclosed by the side walls (2.1, 2.2), the glazing interior wall, and the outer wall, wherein - a first metallic reinforcing element (6.1) is attached outside on the polymeric hollow profile in a first indentation (7.1) provided for this such that it encloses the corner between the first side wall (2.1) and the outer wall, - a second metallic reinforcing element (6.2) is attached outside on the polymeric hollow profile in a second indentation (7.2) provided for this such that it encloses the corner between the second side wall (2.2) and the outer wall, - the first and second metallic reinforcing elements (6.1, 6.2) are attached in the first and second indentations (7.1, 7.2) such that in each case they end flush with the first and second side walls (2.1, 2.2) and the outer wall, - a gas-tight and moisture-tight barrier film is applied on the first side wall (2.1), the first metallic reinforcing element (6.1), the outer wall, the second metallic reinforcing element (6.2), and the second side wall (2.2) of the polymeric hollow body, wherein the regions of the two side walls (2.1, 2.2) adjacent the glazing interior wall are free of barrier film. - a polymeric hollow profile, comprising - a first side wall (2.1) and a second side wall (2.2) arranged parallel thereto, - a glazing interior wall, which connects the side walls (2.1, 2.2) to one another; - an outer wall, which is arranged substantially parallel to the glazing interior wall and connects the side walls (2.1, 2.2) to one another; - a hollow space, which is enclosed by the side walls (2.1, 2.2), the glazing interior wall, and the outer wall, wherein - a first side wall (2.1) and a second side wall (2.2) arranged parallel thereto, - a glazing interior wall, which connects the side walls (2.1, 2.2) to one another; - an outer wall, which is arranged substantially parallel to the glazing interior wall and connects the side walls (2.1, 2.2) to one another; - a hollow space, which is enclosed by the side walls (2.1, 2.2), the glazing interior wall, and the outer wall, wherein - a first metallic reinforcing element (6.1) is attached outside on the polymeric hollow profile in a first indentation (7.1) provided for this such that it encloses the corner between the first side wall (2.1) and the outer wall, - a second metallic reinforcing element (6.2) is attached outside on the polymeric hollow profile in a second indentation (7.2) provided for this such that it encloses the corner between the second side wall (2.2) and the outer wall, - the first and second metallic reinforcing elements (6.1, 6.2) are attached in the first and second indentations (7.1, 7.2) such that in each case they end flush with the first and second side walls (2.1, 2.2) and the outer wall, - a gas-tight and moisture-tight barrier film is applied on the first side wall (2.1), the first metallic reinforcing element (6.1), the outer wall, the second metallic reinforcing element (6.2), and the second side wall (2.2) of the polymeric hollow body, wherein the regions of the two side walls (2.1, 2.2) adjacent the glazing interior wall are free of barrier film.