Assemble two glass panes with a spacer, usually made of stainless steel, aluminium or structural foam, and apply an adhesive sealant to press the glass panes against the spacer. Drill holes in the spacer to draw out the air, fill the space with gas or leave the vacuum, then seal the holes.
DATA SOURCED FROM ESCO (EUROPEAN COMMISSION) & O*NET (U.S. DEPARTMENT OF LABOR)