Abstract: A spacer is provided for an insulating glazing unit that includes at least two spaced-apart glazing panes connected along their edges via the spacer in a mounted state in which the spacer is mounted at the edges to limit an interspace, which is defined between the glazing planes and is filled with gas. The spacer has an inner wall (14) connecting side walls (11, 12) on an inner side that faces the interspace. The inner wall (14) includes a recess portion (14rs, 14rt, 14rc) that enables the 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 (11, 12).

Abstract: A spacer profile for an insulating glazing unit for maintaining a space between glazing panes includes a profile body formed from a first heat insulating material that has, viewed in a cross section perpendicular to a longitudinal direction, outer side walls extending in a height direction and that has a distance in a transverse direction smaller than a first width, each side wall having an inner protrusion protruding towards the opposite side wall into a recess which is open to the inner side, and a diffusion barrier film made from a second material and firmly bonded with the profile body and, viewed in the cross section perpendicular to the longitudinal direction, extending over the profile body on the outer side of the spacer profile and continuous thereto in the height direction on the outside of the side walls and/or in the same to a second height and into the protrusions.

Abstract: A spacer profile for an insulating glazing unit for maintaining a space between glazing panes includes a profile body formed from a first heat insulating material that has, viewed in a cross section perpendicular to a longitudinal direction, outer side walls extending in a height direction and that has a distance in a transverse direction smaller than a first width, each side wall having an inner protrusion protruding towards the opposite side wall into a recess which is open to the inner side, and a diffusion barrier film made from a second material and firmly bonded with the profile body and, viewed in the cross section perpendicular to the longitudinal direction, extending over the profile body on the outer side of the spacer profile and continuous thereto in the height direction on the outside of the side walls and/or in the same to a second height and into the protrusions.