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Duralite® is a flexible, single seal spacer bar that features composite laminate technology from Quanex, Edgetech’s parent company.

Traditionally, insulating glass units used a metal double glazing spacer bar to separate the two panes of glass. Typically made from aluminium, these metal spacer bars were highly conductive, and facilitated heat loss rather than preventing it.

The first single seal warm edge spacer bar was introduced in the 1960s, and has been redeveloped today as Duralite® from Quanex. Ideal for high-volume production of double and triple pane insulating glass units, Duralite® spacers optimize argon retention and moisture prevention.

Applied in a single step using heat, minimal compression and just one corner seam, combined with Low-E glass and argon gas, this high-performance spacer produces one of the highest performing, energy-efficient window systems possible.

The need for each corner to be mechanically joined and sealed is eliminated with Duralite®, which provides a unique approach to solving the challenge of installing double glazing within conservation areas. Duralite’s® flexibility and low sightlines allows it to follow the variable surface of traditional hand-blown glass with ease and finesse.

Duralite® Spacer Features

  • Non-metallic
  • Composite Laminating Technology
  • Superior edge sealing technology
  • Warmer edge of glass temperature
  • Lowest conductivity warm-edge spacer
  • Superior Argon gas retention
  • Heightened condensation resistance
  • Black sightlines
  • Smooth appearance

Special Features

Duralite Technical information

  • Preassembled with an air-filled polycarbonate shim, butyl sealant, a three-sided continuous moisture barrier and a desiccated topcoat
  • Reduces window U-values by up to 0.08W/m2K
  • Excellent Bondline Adhesive UV resistance
  • Dew Point Development: -20° F (-29° C) in 48 hrs
  • Moisture Vapor Transmission Rate: 0.09 g H20/m² per 24 hrs
  • Argon Permeance: 6-8 c.c/100 in.² per 24 hrs
  • Volatile Fogging: Passes

Looking for insulating glass units with warm edge spacer systems? Get in touch with our team to find a supplier local to you.


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