Kas-Kel Warm Edge Spacers Enhance Your Comfort

It’s What’s Between the Glass That Makes All the Difference

Windows built with Duralite® technology reduce heat transfer and help stabilize the temperature of the inner windowpane, maintaining a comfortable inside environment, condensation-free glass, and saving you money on energy costs.

Duralite® is a flexible, warm-edge spacer that lives between the inner and outer window panes. The Duralite® technology features a unique no metal composite laminating system that provides superior durability and thermal performance for glass insulation in all weather.
A Kas-Kel vinyl window with Duralite® spacers contains an argon gas-filled polycarbonate shim with a virtually impermeable butyl sealant, a three-sided continuous moisture barrier, and a desiccated topcoat. This advanced design eliminates condensation and mold and allows natural light to filter in with UV blocking technology that protects interior finishes and decor.

Windows built with Duralite® stand up to the most severe weather conditions in both hot and cold climates, eliminating the need for storm windows.
Duralite® thermal performance ranks among the top rated vinyl window brands for keeping energy costs low by reducing heat loss in winter and heat gain in summer.
Duralite® is an Energy Star qualified product and built to function for years after installation.