Spacer for an insulated window panel assembly

An insulated window panel, comprising:

• two window panes spaced from each other to define a space therebetween;
• a generally polygonal tube having a first wall interconnected to an opposing second wall by a pair of opposing sidewalls, said first wall facing into the space and said second wall disposed wholly between said window panes and said first wall having a width less than said second wall;
• and
• a bead of polymeric sealing material deposited in each of said opposing sidewalls sealing against said two window pane.

A method for manufacturing an insulated window assembly, comprising the steps of:

• forming a length of spacer tubing into a generally polygonal profile, including forming a first wall having a first width, a second opposing wall having a second width less than said first width, and a pair of opposing sidewalls interconnecting said first and second walls, each of said sidewalls extending the length of said spacer tubing;
• applying a bead of sealer to said sidewalls;
• crimping said second wall of said spacer tubing along at least one point to define a fold line;
• bending said spacer tubing at said at least one point to form a corner, said bending step resulting in said second wall moving relatively toward said first wall such that each of said sidewalls does not extend outwardly beyond said first width of said first wall;
• and
• interconnecting a first end of said spacer tubing with a second opposite end of said spacer tubing to form a closed pattern;
• and
• disposing said closed pattern wholly between a pair of window panes.