Thermal Break Aluminum Window and Door Profiles
PA66 GF25 thermal break profiles for energy-efficient buildings. U-value from 1.4 W/m²K.
Product Overview
Here's a problem that building owners in Southeast Asia are increasingly encountering: they've invested in a high-quality air conditioning system, but the building still feels hot near the windows, and there's condensation forming on the interior window frames during the rainy season. The culprit, almost always, is thermal bridging through the aluminum window frames.
Aluminum is an excellent conductor of heat — about 1,000 times better than air. In a conventional aluminum window frame, heat flows freely from the hot exterior face to the cool interior face, warming the interior surface and driving up the air conditioning load. In a climate like Ho Chi Minh City or Bangkok, where the exterior temperature regularly exceeds 35°C and the interior is air-conditioned to 22°C, this thermal bridge can account for 15–25% of the total window heat gain.
A thermal break profile solves this by inserting a low-conductivity polyamide (PA66 GF25) bar between the inner and outer aluminum sections. The polyamide has a thermal conductivity of 0.3 W/m·K, compared to 160 W/m·K for aluminum — over 500 times lower. This barrier reduces the frame U-value from approximately 5.8 W/m²K (standard aluminum) to 1.4–2.4 W/m²K (thermal break), depending on the barrier width.
The practical benefits are tangible. In a building with thermal break windows, the interior surface temperature of the frame stays above the dew point even on the hottest days, eliminating condensation. The reduced heat gain through the frame lowers the air conditioning load, reducing energy consumption and operating costs. For green building certifications — LEED, BCA Green Mark, EDGE — the improved frame U-value contributes directly to the energy performance score.
Our thermal break profiles use PA66 reinforced with 25% glass fiber (PA66 GF25). The glass fiber reinforcement is critical — it increases the tensile strength of the polyamide bar from 80 MPa (unreinforced) to 180 MPa, and reduces creep under sustained load. The aluminum-to-PA66 joint is tested to EN 14024, which requires a minimum shear strength of 24 N/mm. We provide test certificates with every shipment.
Technical Specifications
| Thermal Barrier Material | PA66 GF25 |
|---|---|
| Thermal Barrier Width | 14.8 mm / 24 mm / 34 mm |
| Alloy / Temper (aluminum) | AA 6063-T5 |
| U-Value (window system) | 1.4 – 1.8 W/m²K |
| Condensation Resistance | CRF ≥ 65% |
| Thermal Break Test Standard | EN 14024:2004 |
| PA66 Shear Strength | ≥ 24 N/mm |
System Interfaces, Fabrication and Delivery Controls
Architectural profiles must be bought as an interacting system. Frame, sash, glazing bead, gaskets, hardware, drainage and finish need to be checked together rather than ordered as isolated section shapes.
Information for an Accurate Inquiry
- System section and assembly drawing
- Glass / gasket / hardware schedule
- Profile and accessory BOM
- Finish / colour / cosmetic face requirements
- Cutting, packing, destination and acceptance records
Related Engineering Guides
- Aluminum Window Profile Systems: Components and Interfaces — Map frame, sash, beads and hardware before ordering.
- Glass Thickness and Glazing Bead Compatibility — Validate the glazing stack against the system.
- Window Drainage and Weather Seals — Review fabrication and assembly interfaces.
- Ordering Aluminum Window Profile Sets — Control BOM, accessories and packaging.
Request a Technical Quote
For drawings, MTRs, samples, pricing, and lead time, contact Andy: WhatsApp +86 151 1618 3980 or lkvicky2003@gmail.com. Please include profile reference, alloy/temper, surface finish, quantity, and destination port.