Spacer with improved mechanical stiffness

A spacer for insulating glass units, comprising:

• a polymer hollow profile extending in a longitudinal direction, having a first side wall and a second side wall arranged parallel thereto, a glazing interior wall which extends in a transverse direction between the first and second side walls and connects them to one another, an outer wall which is arranged at least partially parallel to the glazing interior wall and perpendicular to the first and second side walls and connects the first and second side walls to one another, and a cavity which is enclosed by the first and second side walls, the glazing interior wall and the outer wall,
• a plurality of continuous fibers, wherein each continuous fiber has a fiber length along its extension which corresponds to a dimension of the polymer hollow profile along the extension of the continuous fiber,
• wherein the plurality of continuous fibers are embedded in a polymer carrier, and
• wherein a polymer carrier is arranged with the plurality of continuous fibers on a surface of the glazing interior wall, and/or a surface of the outer wall, and/or a surface of the first side wall, and/or a surface of the second side wall.