Climate stress compensating spacer

A spacer for use in manufacturing an insulating glazing unit, in which edges of at least two spaced-apart glazing panes are connected via the spacer in a mounted state in which the spacer is mounted along the edges to limit an interspace filled with gas, the spacer extending with an essentially constant cross-section (x-y) in a longitudinal direction (z), the spacer comprising:

• a plastic body extending in the longitudinal direction (z) and having two lateral side walls and an inner wall located on an inner side of the spacer and configured to face the interspace when the spacer is mounted between the glazing panes, and a gas-diffusion barrier film formed on the outer side of the spacer which faces away from the interspace when the spacer is mounted between the glazing panes,
• wherein:
• the lateral side walls are configured to respectively face the glazing panes in a width direction (x) that is perpendicular to the longitudinal direction (z) when the spacer is mounted between the glazing panes,
• the lateral side walls extend, in the cross section (x-y), in a height direction (y) that is perpendicular to the longitudinal direction (z) and the width direction (x), towards the inner side up to respective inner ends of the lateral side walls,
• lateral outer sides at the inner ends of the lateral side walls are separated by a predetermined distance (w1) in a state in which no external pressure force or no external tensional force is applied to the lateral side walls,
• the inner wall connects the lateral side walls on the inner side of the spacer,
• a chamber configured to accommodate desiccating material is defined, in a cross-sectional view perpendicular to the longitudinal direction (z), on respective lateral sides by the lateral side walls and on the side facing the interspace by the inner wall,
• the inner wall is configured to allow gas exchange between the interspace and the chamber when the spacer is mounted between the glazing panes,
• the spacer has a predetermined width (w1) in the width direction (x) corresponding to the predetermined distance, and a predetermined height (h1) in the height direction (y),
• the predetermined width (w1) is a value selected from a range of 10-20 mm,
• the predetermined height (h1) is a value selected from a range of 6-8 mm, and
• the inner wall comprises a recess portion having a depth (dr) in the height direction (y) of at least 1.5 mm, a width (w2) in the width direction (x) of at least 2.5 mm and a wall thickness (dt) in a range of 20% to 80% of a wall thickness (diw) of other parts of the inner wall, the recess portion being configured to allow a length of the inner wall to change in the width direction in response to an external pressure force or an external tensional force applied to the side walls in the width direction (x).