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Duralite® Warm-Edge Spacers for Windows

Duralite® from Quanex is a warm-edge spacer system used in the high-volume production of dual- and triple-pane insulating glass (IG) units. Windows made with Duralite spacer systems have a smooth surface appearance, superior argon gas retention and a warmer edge of glass, adding comfort and energy efficiency to homes.

For production efficiency, Duralite has a patented design that is applied in a single step using heat and minimal compression. It comes preassembled with proven components, including a sealant, the spacer itself and desiccant. It requires minimal compression for efficient handling. It’s an IG window spacer you can count on for optimal production, enhanced thermal performance and longevity for your customers.

Technical data

  • Composite laminating technology
  • Polycarbonate spacer element (nonmetal)
  • Black or gray sightline
  • Proven adhesive technology
  • Optimized packaging
  • Sizes to accommodate airspaces of ¼” (6 mm) to 13/16″ (20.5 mm)


  • Smooth surface appearance
  • Superior argon gas retention
  • Improved condensation resistance
  • Warmer edge of glass temperature

IG Systems Product Literature

Safety Data Sheet

Additional Product Information

The following information is published as general information only. The listed properties and performance characteristics are approximate values and are not part of the product specification.

Thermal Conductance (Klin)
0.080 W/m °C based on ½"
(13 mm) spacer
Ψ (psi per EN ISO 10077):
30% lower than next warmest spacer
Moisture Vapor Transmission Rate
0.09 g H20/m2 per 24 hrs ASTM F 1249
Volatile Fogging
PassesASTM E 2189 CGSB 12.8
Argon Permeance
6-8 c.c/100 in.2 per 24 hrs. ASTM D 1434
Bondline Adhesive UV Resistance
Dew Point Development
-20 °F (-29 °C) in 48 hrsASTM E 546
Tensile Strength
50 psi TST 389C

This page was last updated on December 16, 2022. Downloaded document versions may differ. Please check the individual documents for most current version.

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