Aluminum Alloy Doors and Windows

Aluminum alloy doors and windows are constructed using extruded aluminum alloy profiles for frames, mullions, and sashes, and represent the most widely used type of fenestration system in modern architecture.

Among these, the highest energy efficiency is achieved by thermally broken (insulated) aluminum alloy doors and windows. Conventional aluminum alloys are excellent thermal conductors; when significant temperature differences exist between indoor and outdoor environments, standard aluminum frames can act as a “thermal bridge,” facilitating unwanted heat transfer.

The thermal break technology addresses this issue by interrupting the aluminum profile at its center with a high-strength, low-conductivity polymer strip—typically made of polyamide (PA66). This insulating barrier effectively separates the interior and exterior aluminum sections, drastically reducing thermal conductivity. Since plastic transfers heat far more slowly than metal, the thermal break minimizes heat loss in winter and heat gain in summer, significantly enhancing the overall energy performance, comfort, and condensation resistance of the building envelope.