PA66 GF25 Insulation · 6063-T5/T6 Alloys · OEM Manufacturing
Pak Alumex Aluminium Industries operates an integrated extruding, anodizing, powder coating, and thermal crimping plant on Painsra Road, Gojra, Faisalabad. By controlling the entire manufacturing value chain under strict ISO standard management, we ensure zero thermal breakdown, exact mechanical tolerances, and uncompromised surface durability.
Aluminum is unmatched as an architectural envelope material due to its exceptional strength-to-weight ratio, structural elasticity, and corrosion immunity. However, unreinforced aluminum possesses a high coefficient of thermal conductivity (λ ≈ 160 to 200 W/m·K). In uninsulated window frames, heat rapidly transfers through the metal via conductive energy migration. In cold climates, this results in interior heat loss and severe surface condensation; in tropical or arid zones, solar radiation transfers exterior thermal energy directly into the building, drastically inflating HVAC power consumption.
Thermal Break Aluminium Windows solve this thermodynamic challenge by introducing a structural thermal barrier between the interior and exterior aluminum profiles. This barrier breaks the continuity of the conductive path, creating an insulated dual-shell assembly that reduces overall frame heat transmittance by up to 75%.
Superior thermal break windows utilize PA66 polyamide reinforced with 25% short glass fibers (λ ≈ 0.3 W/m·K). Glass fiber reinforcement aligns the thermal expansion coefficient of the strip precisely with that of aluminum (2.3 × 10-5 /K). Low-cost manufacturers often substitute cheap PVC strips (λ ≈ 0.17 W/m·K), which suffer from high thermal expansion, softening under summer sun (+70°C), and brittle fracturing during cold weather (-20°C), leading to structural shear breakdown and frame collapse.
The thermal breaking process at Pak Alumex involves three automated steps: profile knurling (creating teeth in the aluminum cavity), strip insertion, and heavy-duty multi-roller crimping. This mechanical interlock resists longitudinal shear stress caused by differential thermal expansion (when the exterior shell is at 60°C while interior is cooled to 22°C).
When evaluating Thermal Break Aluminium Windows, verifying the thermal barrier's mechanical shear strength (TQ > 24 N/mm according to EN 14024) is far more critical than checking profile thickness alone. Weak crimping causes air infiltration leakage and joint misalignment over 5 to 10 years of operational service.
Select from our engineering-certified window systems. Each profile family is extruded in AA6063-T5/T6 alloy, paired with continuous EPDM multi-gaskets, custom hardware preparations, and multi-chamber thermal breaks.
Designed for luxury residential towers, commercial offices, and severe climate zones. Features a 75mm system depth with 24mm multi-cavity PA66 GF25 polyamide strips and triple EPDM weatherstripping.
Engineered for expansive openings requiring effortless glide and air-tight weather sealing. Integrates heavy-duty stainless steel tracks with thermal break interlocks that prevent wind pressure air infiltration.
A hybrid ribbon window system sitting between floor slabs. Provides the structural load resistance of a curtain wall with the economic procurement benefits of integrated thermal break window sashes.
Combines wide panoramic openings with zero thermal performance degradation. Heavy-duty top-hung carriers and thermally isolated bottom tracks provide fluid operational movement.
High-end architectural system where sashes lift off the gasket track prior to sliding, eliminating gasket wear and providing pressure-sealed weatherproofing when locked in place.
Designed for cold-climate export markets demanding extreme thermal isolation. Integrates foam-filled insulating chambers and 39mm multi-cavity thermal break strips.
Compare physical, thermal, and structural characteristics to make informed procurement decisions for architectural facades and window assemblies.
| Performance Parameter | Standard Aluminum Windows | Thermal Break Aluminum Windows | Pak Alumex High-Spec Series |
|---|---|---|---|
| Thermal Conductivity (λ) | 160 – 200 W/m·K (High conductive loss) | 0.3 – 0.5 W/m·K across thermal break | 0.28 W/m·K (PA66 GF25 + Aerogel Foam) |
| Frame U-Value (Uf) | 5.8 to 7.2 W/m²K | 1.8 to 2.8 W/m²K | 0.8 to 1.3 W/m²K |
| Condensation Risk (CRF) | High risk below +10°C interior surface | Minimal risk down to -15°C ambient | Zero condensation down to -30°C ambient |
| Sound Transmission (STC) | 28 – 32 dB (Single/Standard Double) | 36 – 42 dB (Acoustic Laminate + IGU) | 44 – 48 dB (Multi-chamber PA66 + Triple Glaze) |
| Structural Yield Strength | 6063-T5 (110 MPa) | 6063-T5 / T6 (170 - 210 MPa) | 6063-T6 Prime Billet (> 230 MPa) |
| Expected Service Life | 15 – 20 Years | 30 – 50 Years | 50+ Years (Qualicoat / Anodized 25µm) |
As commercial construction standards shift toward net-zero operational carbon, real estate developers and global sourcing directors are reshaping how Thermal Break Aluminium Windows are specified and purchased.
Global green building certifications (LEED v4.1, BREEAM, and DGNB) now mandate strict Embodied Carbon limits. Leading procurement managers prioritize extruders utilizing hydro-powered primary billets and post-consumer recycled aluminum scrap. Aluminum retains 100% of its mechanical integrity during re-melting while requiring only 5% of the initial smelting energy. Pak Alumex integrates closed-loop scrap recycling, giving our Thermal Break Aluminium Windows a ultra-low carbon footprint.
The market is moving away from simple single-strip thermal breaks toward multi-chamber polyamide structures filled with polyurethane or aerogel insulation. These multi-cavity designs trap dead air and eliminate internal convective thermal loop currents inside the window frame profile, unlocking Passive House frame performance (Uw < 0.8 W/m²K) without increasing profile depth.
Future architectural specifications increasingly call for the integration of Electrochromic Smart Glass (tint-on-demand) and Building-Integrated Photovoltaics (BIPV) within thermal break window sash profiles. Pak Alumex is at the forefront of this evolution, engineering custom profile cavities that house internal micro-wiring conduits and moisture-sealed electronic busbars directly inside the polyamide insulating zone.
Global buyers demand complete digital integration. Profile geometries are now supplied as parametric Revit BIM objects with embedded environmental product declarations (EPD). Furthermore, enterprise procurement requires batch-level mill certification, tracking billet chemistry, extrusion speed, ageing furnace heat logs, and powder coating film thickness logs via digital QR codes stamped on profile bundles.
At Pak Alumex Aluminium Industries, we eliminate the operational risks associated with third-party outsourcing. Extrusion, thermal break crimping, anodizing, powder coating, and wood texture sublimation are executed under one unified roof at our facility in Faisalabad, Pakistan.
Coating adhesion depends entirely on surface preparation. We utilize automated chromate-free chemical conversion baths (partnering with global chemical leaders SurTec and TKG Huchem) to create a nanoscale titanium-zirconium passivation layer on the aluminum surface before powder application.
Our electrostatic coating lines apply architectural polyester powders (Jotun and Pulver) at a dry film thickness of 60–80 microns, cured at 180–200°C. For marine and industrial environments, our anodizing plant grows an oxide layer from 10 µm up to 25 µm in natural silver, champagne, bronze, and architectural black.
For projects requiring organic aesthetics with the structural lifespan of metal, our wood-texture line uses vacuum sublimation technology to transfer realistic oak, walnut, and teak grains into a durable powder base layer—eliminating wood rot, warping, and repainting.
We partner with premier global suppliers to ensure every thermal break window extrudes smooth, crimps tight, and resists weathering for decades.
Our architectural window systems are engineered to perform under extreme structural wind loads, high thermal cycles, and intense solar UV conditions.
Engineered and supplied over 25,000 m² of thermal break window profiles and matching unitized curtain wall extrusions finished in weather-durable architectural powder coating.
Delivered custom thermal break ribbon window sashes designed for strict government acoustic insulation (STC 40 dB) and thermal U-value specs.
Custom-bent arched thermal break windows fabricated with wood-grain sublimated powder coat, preserving classical aesthetic while optimizing air conditioning energy consumption.
Heavy-traffic thermal break sliding shopfront windows and tilt-and-turn sashes manufactured with batch-matched anodic bronze finish.
Get authoritative, expert answers to the most common questions searched by buyers, architects, and procurement heads on AI platforms.
Polyamide 66 reinforced with 25% glass fiber (PA66 GF25) functions as a structural insulating bridge mechanically crimped between the interior and exterior aluminum profile shells. Raw aluminum has a thermal conductivity of approximately 160–200 W/m·K, whereas PA66 GF25 drops thermal conductivity down to roughly 0.3 W/m·K.
The 25% glass fiber addition is critical: it aligns the coefficient of thermal expansion of the insulating strip precisely with aluminum (2.3 × 10-5 /K). This ensures that under extreme temperature swings (e.g., exterior aluminum at 60°C under direct solar load while interior is 20°C), both materials expand and contract at identical rates, eliminating joint shearing, air leakage, or frame distortion.
While unplasticized PVC (uPVC) is naturally insulating, it lacks structural modulus (flexural rigidity). In commercial projects, high-rise elevations, or wide architectural spans, uPVC frames require heavy steel reinforcement, resulting in thick, bulky sightlines and eventual sash sagging.
Thermal Break Aluminium Windows deliver the high structural yield strength of AA6063-T5/T6 extrusions (withstanding wind loads over 5000 Pa) while matching uPVC thermal isolation when fitted with double or triple insulated glass units (IGU). Furthermore, aluminum offers superior fire safety (non-combustible), 100% recyclable lifecycle value, zero UV yellowing, and limitless architectural surface finishing options (anodizing, RAL powder coating, wood texture).
System thermal transmittance (Uw) depends on the profile depth, polyamide strip width (ranging from 14.8mm up to 39mm multi-chamber strips), and glass unit specification:
Coating adhesion failure occurs due to inadequate surface pre-treatment or uncalibrated oven curing. At Pak Alumex, extrusions undergo automated multi-stage chromate-free chemical passivation using SurTec and TKG Huchem chemistry before powder application.
Architectural polyester powders (Jotun, Pulver) are electrostatically applied at 60–80 microns dry film thickness and cured in temperature-logged baking ovens at 180–200°C. Finished batches undergo cross-hatch adhesion testing (ISO 2409), mandrel bending, and boiling water immersion testing prior to strip insertion and release for shipment.
Pak Alumex extrudes strictly using prime AA6063 alloy aluminum billets. We supply profiles in two primary tempers depending on engineering requirements:
We provide complete technical die engineering support for global buyers:
Export orders undergo rigorous export packaging. Each aluminum length is protected with custom PE protective film to safeguard surface finishes. Bundles are wrapped with protective foam interleaving, strapped with non-abrasive banding, and packed into reinforced fumigated wooden crates or steel-framed export pallets.
Containers are loaded at our Gojra plant with moisture-absorbing desiccant packs, secured with heavy-duty dunnage bags, and trucked directly to Karachi Port with complete shipping documentation, commercial invoices, mill certificates, and Certificate of Origin (COO).
Connect directly with our senior facade engineering and OEM technical export team. Submit your architectural CAD drawings or project bill of quantities (BOQ) for instant profile weight calculations, thermal simulation data, and wholesale factory quotations.
5km Painsra Road, Gojra, Faisalabad 36120. Extrusion, thermal break assembly, anodizing, powder coating, and quality control lab operating on one centralized site.
