In modern construction, energy efficiency is paramount. For aluminium window, door, and facade systems, this translates directly to the effectiveness of the thermal break. An aluminium profile, while structurally robust, is highly conductive, creating a “thermal bridge” that allows heat to escape in winter and enter in summer, leading to significant energy loss and internal condensation.
A high-performance system must incorporate a thermal break (a non-metallic barrier inserted between the inner and outer parts of the aluminium profile) to disrupt this path of heat flow.
Here is a look at the essential components and seals an expert aluminium extrusion profile supplier provides to ensure maximum thermal performance.
More info here about aluminium windows.
The Core Component: Polyamide Profiles
The most common material for the thermal break component itself is Polyamide (PA) reinforced with glass fibers. Polyamide offers a low thermal conductivity, effectively isolating the interior and exterior profile shells.
- Structure: The aluminium is split into two halves (inner and outer). The Polyamide strips are precisely extruded to fit into specific channels within the aluminium, using a process called rolling or crimping to mechanically lock the two aluminium parts together.
- Dimensional Accuracy: The component’s geometry must be extremely accurate. Any gap or misalignment compromises the mechanical strength and creates an air passage, undermining the insulation. A reliable aluminium extrusion profile supplier guarantees stringent control over the Polyamide dimensions and surface finish.
The Role of Seals and Gaskets in Thermal Performance
While the polyamide profile stops conduction, the seals stop convection and air leakage. Without proper sealing, air can circulate through the chambers of the extrusion profiles, nullifying the thermal break’s effect.
- Insulating Chamber Seals: Specialized EPDM or TPE seals are used within the thermal break chambers. These seals create tight air pockets, trapping the air and boosting the system’s overall U-value (reducing heat transfer).
- External and Internal Gaskets: These seals, often designed with complex geometries for the t slot aluminium or glazing pocket, prevent uncontrolled air infiltration (leakage) and water ingress. Stopping air leakage is critical because moist, warm air from indoors escaping to the colder exterior profile section is the primary cause of condensation and mold formation.
The Impact of Profile Connector Design
In complex assemblies, such as corners or mullion/transom junctions, the thermal continuity must be maintained. This is where the design of the profile connector and ancillary seals becomes crucial.
- Corner Joints: The thermal break must continue seamlessly around the corner. Suppliers often use specialized resin or thermal filler blocks inside the aluminium profile to insulate the area where the Polyamide strips are cut.
- Junction Seals: At the point where two extrusion profiles meet (the joint), small, often pre-formed, rubber gaskets (corner slots or joint seals) are required to close any minor gap that the main gasket system might miss. These seals ensure a continuous barrier against air and moisture across the entire frame.
Why Choose ISOGOM for Thermal Break Components and Seals?
As a specialized aluminium extrusion profile supplier (focusing on the sealing components), ISOGOM ensures that your thermal breaking system achieves its full potential. We provide high-quality sealing solutions that complement the Polyamide strips:
- Material Expertise: EPDM and TPE compounds optimized for low compression set and long-term stability in extreme temperatures.
- Precision Extrusion: Gaskets with geometries designed to integrate perfectly with the Polyamide and the aluminium chamber walls, maximizing thermal resistance.
- Custom Solutions: Ability to design profile connector and t slot aluminium seals that address unique thermal bridging challenges in specific facade or window designs.
Contact us to discuss your thermal break project.
We will supply the sealing components and expertise needed to achieve superior energy ratings and condensation control in your aluminium systems.
