Spacer profile and insulating pane unit having such a spacer profile

A spacer profile configured to be used in a spacer frame of an insulating pane unit for door or window or facade elements, the insulating pane unit comprising at least first and second panes having an intervening space defined therebetween, the spacer profile comprising:

• a hollow profile body made of a synthetic material and having a chamber configured to accommodate hygroscopic material defined therein, the hollow profile body extending in a longitudinal direction (Z) and comprising:
• an inner wall configured to face towards the intervening space between the panes in an assembled state of the insulating pane unit and to border the chamber,
• an outer wall disposed opposite to the inner wall in a height direction (Y), which is perpendicular to the longitudinal direction (Z),
• a first side wall, and
• a second side wall disposed opposite to the first side wall in a transverse direction (X), which is perpendicular to the longitudinal direction (Z) and to the height direction (Y), the first and second side walls respectively being connected with the inner wall and the outer wall to form the chamber;
• a first reinforcement layer made of a first metallic material having a first specific heat conductivity (λ1), the first reinforcement layer extending in the longitudinal direction (Z) in one piece at least in part on the first side wall, having a constant cross section perpendicular to and in the longitudinal direction (Z), and having a first thickness (d1);
• a second reinforcement layer made of a second metallic material having a second specific heat conductivity (λ2), the second reinforcement layer extending in the longitudinal direction (Z) in one piece at least in part on the second side wall, having a constant cross-section perpendicular to and in the longitudinal direction (Z), spaced by a first distance from the first reinforcement layer, and having a second thickness (d2);
• and
• a diffusion barrier layer having a third thickness (d3;
• d33) and a third specific heat conductivity (λ3, λ33), the diffusion barrier layer being disposed on the outer wall at least between the first reinforcement layer and the second reinforcement layer and being connected with the first reinforcement layer and the second reinforcement layer in a diffusion-proof manner to form a diffusion barrier;
• wherein the multiplication product of the third specific heat conductivity (λ3, λ33) and the third thickness (d3;
• d33) is less than both (i) the multiplication product of the first specific heat conductivity (λ1) and the first thickness (d1) and (ii) the multiplication product of the second specific heat conductivity (λ2) and the second thickness (d2), and
• the diffusion barrier layer is disposed substantially on a neutral axis, which is defined by bending the spacer profile by 90° about an axis parallel to the transverse direction (X) with the inner wall lying further inward than the outer wall with reference to the bending radius.