Abstract: An elongated spacer is disclosed for use in separating the glass panes in multiple-glazed thermal windows. The spacer has an elongated hollow interior for storing a dessicant material and a plurality of moisture barrier partitions at intervals along the length of the interior. The spacers are originally manufactured in oversized lengths and later cut to fit particular windows. The partitions divide the elongated interior into subcompartments, and when the spacer is cut to length the partitions confine moisture contamination and dessicant loss to the particular subcompartment which is cut.

Abstract: A corner piece for connecting adjacent hollow spacer members to form a spacer frame used in the construction of thermally insulated windows. The corner piece includes horizontal and vertical legs forming a right angle. One end of each leg has a cutting edge. When the ends of each leg are inserted into a hollow spacer which has internal partitions, the sharpened cutting edge is able to cut around the adjacent partition and thus enter the spacer fully. The corner piece is constructed in a manner which permits sealant to be injected into the corner pieces and the spacers after assembly to seal off any gaps around the installed corner piece.