For structural sliding doors with large sash dimensions (over 2.4 meters in height or sashes exceeding 200 kg), alloy 6063-T6 or 6061-T6 is strongly recommended. 6063-T6 provides an ultimate tensile strength of around 205 MPa and yield strength of 170 MPa, offering superior resistance against frame twisting and wind deflection ($L/175$ criteria) compared to standard T5 temper. T5 remains suitable for internal partitions or smaller sliding window sashes.

Aluminum is naturally highly conductive ($k \approx 160-200 \text{ W/m}\cdot\text{K}$). Thermally broken sliding doors solve this by physically separating the interior and exterior extruded aluminum profiles with structural, low-conductivity polyamide strips (usually PA66 GF25 — 25% glass fiber reinforced). This thermal barrier reduces conductive heat transfer, lowering overall frame thermal transmittance ($U_f$) to between 1.3 and 2.0 W/m²K when combined with low-E argon-filled double or triple glass units.

Conventional sliding doors rest permanently on their rollers and weather-brushes, creating friction during movement and potential seal wear over time. Lift-and-Slide doors use a specialized gear handle. Turning the handle 180 degrees physically lifts the door sash up by 5mm to 8mm off the frame gasket, allowing even 400kg glass panels to slide effortlessly on sealed ball-bearing tandem rollers. When locked, the sash lowers onto continuous EPDM compression gaskets, delivering exceptional air tightness (Class 4) and water resistance (Class 9A).

Our custom tooling workflow follows four strict engineering steps: 1) CAD/DWG geometry and structural calculation review; 2) Precision CNC die manufacture using high-grade H13 hot-work tool steel; 3) Extrusion die trial and press speed calibration; 4) First-Article Inspection (FAI) sample production. Physical profile samples and CMM dimensional check reports are shipped to the customer for written sign-off before full-scale extrusion runs begin.

For severe marine or coastal exposures (within 3 km of seawater), we specify Qualanod Class 1 architectural anodizing with an oxide film thickness of 20 to 25 microns ($\mu\text{m}$), or Qualicoat Class 2/3 super-durable architectural powder coating (60–80$\mu\text{m}$) applied over a chromate-free zirconium pre-treatment wash. This combination prevents filiform corrosion, chalking, and salt-spray degradation under ASTM B117 salt spray testing.

Standard production lead times for custom extruded and coated profile orders range from 15 to 25 business days following sample approval. Profiles are packaged in standard 5.8m or 6.0m lengths (custom cut lengths available up to 7.0m) to maximize 20ft and 40ft High Cube container utilization. Shipments dispatch from Karachi Port with full bill of lading, certificate of origin, mill test certificates, and commercial invoices.