China Top Aluminium Sash Windows Manufacturers & Manufacturer

6063-T5 is cooled from an elevated temperature shaping process and artificially aged. It offers a typical tensile strength of roughly 150–160 MPa and a yield strength of 110 MPa, making it easy to form into intricate shapes with clean surface finishes. In contrast, 6063-T6 undergoes solution heat treatment followed by artificial aging. This increases tensile strength to over 205 MPa and yield strength to 170–180 MPa, delivering greater structural rigidity. For high-rise sash windows, oversized picture combinations, or areas prone to coastal wind shear, T6 temper is specified to resist deflection and wind pressure without adding bulky profile depth.

Aluminum has a high thermal conductivity of approximately 160–200 W/m·K. Without an insulation barrier, indoor heat rapidly escapes outdoors in cold weather, causing the interior profile to chill and create condensation. PA66-GF25 is a polyamide 6.6 polymer reinforced with 25% short glass fibers, yielding a low thermal conductivity of roughly 0.3 W/m·K while matching aluminum's coefficient of thermal expansion (2.3 × 10⁻⁵ /K). This shared expansion rate prevents de-crimping, shear stress, and water leaks across extreme seasonal temperature swings. Combined with multi-cavity chambers and Low-E argon insulated glass units, it drives overall window U-values (Uw) down to 1.1–1.5 W/m²·K.

Custom die manufacturing begins with an approved 2D CAD cross-section (DWG/DXF) showing nominal dimensions, tolerances, wall thicknesses, and critical functional zones (e.g., screw ports, gasket pockets, thermal break knurls). A 3D STEP or IGES model is also reviewed to confirm compatibility with matching hardware. The factory's technical department issues an official Die Extrusion Submittal Drawing detailing perimeter calculations, weight-per-meter ratios, alloy callouts, die line orientations, and finish allowances (accounting for ~60–80 microns of powder coat thickness). Die cut-outs proceed only after the client's engineering lead countersigns this submittal.

Ocean transport exposes fenestration products to high humidity, temperature swings, and salt-laden air. Finished profiles receive low-tack protective film to safeguard against scratches during handling. Assemblies are fitted with reinforced plastic corner protectors, wrapped in moisture-barrier bubble film, and secured inside heat-treated, fumigated plywood crates compliant with ISPM-15. Desiccant packs inside the crates absorb container moisture to prevent white oxidation on exposed aluminum edges. Units are organized and packed by installation floor or elevation tag matching the site's approved drawings.

Our CNC machining centers are calibrated to standard European Euro-groove (13.4mm and 15.4mm) and American sash geometries. We source and install hardware from industry-leading European manufacturers (including Siegenia, Roto, GU, and Hoppe) as well as premium domestic architectural brands like Kin Long and CMECH. Systems can feature hidden tilt-and-turn hinges, perimeter mushroom-head multi-point espagnolettes, child-safety restrictor stays, and motorized chain actuators wired for BMS (Building Management System) operation.

Every production batch passes through three QC stages. First, incoming inspection verifies billet composition, tensile properties, and extrusion wall thickness using digital calipers. Second, post-finishing inspection measures coating thickness via magnetic-induction gauges, checks gloss levels, and runs cross-hatch adhesion tests (ISO 2409). Third, assembled units undergo 100% dry-fit mockups to verify diagonal squaring within ±1.5 mm, sash gasket compression, and operating friction. Clients receive an Inspection Certificate and full photo submittal report before freight dispatch.