Thermally Broken Aluminum Window Profile – PA66 Insulated Window Frame Extrusions | Shengxin

The Thermally Broken Aluminum Window Profile represents the culmination of decades of fenestration engineering — a purpose-designed extrusion system that separates the interior and exterior aluminum sections with a low-conductivity PA66 GF25 polyamide strip, creating a thermal barrier that dramatically reduces heat transfer through the window frame. Unlike standard aluminum windows that act as thermal bridges, thermally broken profiles keep interior frame surfaces warmer in winter and cooler in summer, eliminating condensation while reducing heating and cooling energy consumption by up to 25% compared to non-insulated aluminum frames.

Our window-specific thermal break profiles are designed with the complete window system in mind. Each profile incorporates integrated drainage channels to direct water away from the glazing rebate, Euro-groove hardware slots compatible with standard espagnolette locking mechanisms, gasket retention grooves for weather seals, and precisely angled glazing bead seats that ensure uniform compression on the glass unit. The profile geometry is optimised not just for thermal performance but for the practical realities of window fabrication — fast, accurate machining, reliable hardware installation, and consistent weather sealing on the production line.

Shengxin produces both the aluminum extrusion and performs the PA66 thermal break assembly in our vertically integrated factory. 6063-T5 alloy is selected for its excellent extrudability and anodizing response, producing smooth, clean profiles that finish beautifully in anodized, powder coated, or wood grain surfaces. With 29 years of aluminium manufacturing experience, 35 extrusion lines, and a dedicated automated thermal break crimping line, we supply thermally broken window profiles to window fabricators across 97 countries — from standard residential casement windows to high-performance Passive House certified systems. Our profiles are tested to EN 14024 for thermal break mechanical integrity and designed to meet the thermal performance requirements of ASHRAE 90.1, EN 14351-1, and local building energy codes worldwide.

Features & Benefits

• Proven thermal performance: PA66 GF25 strip widths from 14.8mm to 34mm achieve Uf values from 3.2 down to 1.8 W/m²K. When combined with appropriate glazing, whole-window Uw values below 0.8 W/m²K are achievable for Passive House certification.
• Integrated drainage design: Strategically positioned drainage slots and internal chambers channel water ingress away from the glazing rebate and out through the frame bottom — protecting the glazing unit and interior finishes from moisture damage.
• Euro-groove hardware compatibility: Standard 15/20mm hardware slots accept all major European and Chinese locking mechanisms, hinges, and friction stays — no custom hardware required, simplifying fabrication and reducing inventory complexity.
• Multi-point locking ready: Profile chambers are sized to accommodate espagnolette rods, shoot bolts, and corner drives for secure multi-point locking on casement and tilt-turn windows up to 2.4m in height.
• Condensation-free interior surfaces: The thermal break keeps the interior aluminum frame surface within 2-3°C of room temperature, eliminating the condensation that plagues non-insulated aluminum windows in cold weather.
• Acoustic comfort: The PA66 strip dampens vibration transmission through the frame, contributing 2-5 dB of additional sound reduction compared to non-thermally broken profiles — significant for urban and roadside buildings.

Window System Components & Compatibility

Our thermally broken window profiles are part of a complete system designed for seamless integration. The table below outlines the key system components and their standard specifications.

All components are manufactured or sourced by Shengxin, ensuring dimensional compatibility and consistent quality across the complete window system.

Technical Specifications

Window Types & Configurations Supported

Our thermally broken window profile system supports a wide range of window operating types, each with specific profile configurations.

All configurations use the same outer frame geometry and thermal break design, simplifying inventory and fabrication for window manufacturers.

Drainage & Air Sealing Design

Proper water management is critical to window performance. Our thermally broken profiles incorporate a three-stage drainage and sealing strategy.

This three-stage system ensures that any water penetrating the outer seal is captured in the pressure-equalised chamber and drained to the exterior through sill slots, while the inner seal protects the building interior from air leakage and moisture ingress.

Applications

• Residential new-build windows: Single-family homes, apartments, and condominiums where building energy codes mandate thermally broken frames — our profiles deliver the U-values required for code compliance with slim sightlines that maximise glass area.
• Passive House and low-energy buildings: With 34mm PA66 strips and triple-glazing capacity, our thermally broken window profiles contribute to whole-window Uw values below 0.8 W/m²K, meeting the stringent thermal performance requirements of Passive House certification.
• Renovation and retrofit projects: When upgrading from old steel or single-glazed aluminum windows, our profiles provide a modern, high-performance replacement that fits within existing openings while dramatically improving comfort and energy efficiency.
• Cold climate and alpine regions: In locations where winter temperatures routinely drop below -10°C, thermally broken profiles prevent interior frame icing and condensation — a critical comfort and durability consideration for mountain resorts and northern latitude buildings.
• Acoustic-rated window solutions: Combined with laminated acoustic glass, the PA66 thermal break contributes to overall window sound reduction of 35-42 dB, suitable for urban apartments, hotels, and buildings near transport infrastructure.
• Commercial and mixed-use developments: Office buildings, hotels, and retail spaces benefit from the combination of slim aluminum sightlines, thermal efficiency, and robust multi-point locking for security on accessible ground-floor windows.

Value-Added Processing Options

Why Shengxin for Thermally Broken Window Profiles?

Window profile extrusion is unforgiving — a 0.5mm deviation in a glazing bead seat or hardware groove will cause assembly problems, air leaks, or water ingress on the finished window. With 29 years of aluminium manufacturing experience, Shengxin understands the tolerances that window fabrication demands. Our profiles are extruded, thermally broken, and finished under one quality system — giving window manufacturers the consistency they need for efficient production and reliable field performance.

Quality Documentation: Every shipment includes aluminum mill certificates, PA66 strip material certs, thermal break assembly inspection reports, and surface finishing compliance documents. 5,000-ton warehouse and 5 container loading platforms ensure on-time dispatch with proper protective packaging.

Thermally Broken Window Profile FAQ

Custom Thermally Broken Window Profile Solutions

Every window system has unique design requirements. Whether you need a custom frame depth, a different PA66 strip width, specialised drainage features, or a completely bespoke window profile system, Shengxin's custom extrusion and thermal break assembly service delivers precision window profiles engineered to your exact specifications.

How It Works:

1. Send your drawing — 2D PDF/DWG or 3D STEP/IGES file of your window profile design.
2. Our engineers review — we assess extrudability, thermal break integration, and suggest optimisations for Uf performance and fabrication efficiency.
3. Receive a quotation — including die cost, PA66 strip specification, unit price, and lead time.
4. Approve a sample — we extrude the profiles, assemble the thermal break, finish the surface, and send samples for your evaluation.
5. Full production — consistent quality across every bar, delivered on schedule with full documentation.

⚠️ Important Note: All profile images and dimensional drawings on this page are for reference only. Each window profile system is unique — final dimensions, PA66 strip specifications, Uf values, hardware compatibility, and surface finish will be confirmed based on your approved production drawings and thermal simulations. Please contact our engineering team to discuss your specific window system requirements before placing an order.