Thermal Breaks for Aluminum Windows | PA66GF25 Strips & Molds

Thermal breaks are the physical components and the resulting design feature engineered to interrupt a thermal bridge within a building element. They are the practical solution to the problem of heat flow through conductive materials. In the context of metal windows, doors, and curtain walls, a thermal break is a strip of material with low thermal conductivity that is mechanically locked within the aluminum or steel profile. This strip, most commonly made from glass-fiber reinforced polyamide 66 (PA66 GF30), creates a physical separation between the interior and exterior parts of the metal frame. The effectiveness of a thermal break is determined by the material's thermal properties—its low lambda (λ) value—and its mechanical strength, which must be sufficient to transfer structural loads like wind pressure between the separated metal sections. The concept extends to structural thermal breaks, which are high-strength, compression-resistant panels used at critical structural connections, such as between a concrete balcony and the interior floor slab, to prevent the concrete from acting as a massive thermal bridge. For a thermal break to perform as intended, it must form a continuous barrier and be made from a material that does not creep or degrade over time under load and environmental exposure. The implementation of thermal breaks is a non-negotiable aspect of modern, energy-efficient building design, directly contributing to lower U-values, the prevention of condensation, enhanced comfort, and compliance with international energy conservation codes.