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Foshan, Guangdong, China serves as a hub for aluminum window production. Manufacturers in this region produce polygonal windows for global markets. Production facilities utilize aluminum extrusion, CNC machining, and assembly lines. The industry in Foshan adheres to international standards for export. This report provides data on materials, hardware, certifications, and prices for 2026.
The frame material consists of 6063-T5 aluminum alloy. This alloy contains magnesium and silicon as alloying elements. The T5 temper indicates the metal has been cooled from an elevated temperature shaping process and artificially aged. This state provides specific mechanical properties required for window frames.
Manufacturers in Foshan use extrusion presses to shape this alloy into profiles for polygonal windows. Wall thickness ranges from 1.4mm to 3.0mm depending on the structural requirements of the building project.
Polygonal windows incorporate thermal break strips made of PA66GF25. PA66 refers to Polyamide 66 (Nylon 66). GF25 indicates a 25% glass fiber reinforcement. These strips connect the inner and outer aluminum profiles to reduce heat transfer.
The width of the PA66GF25 strip varies from 14mm to 34mm. Thickness specifications range from 1.4mm to 3.0mm. The integration of these strips affects the U-value of the window system.
Window hardware includes hinges, handles, locks, and friction stays. Foshan manufacturers integrate hardware from brands such as SIEGENIA, ROTO, and HOPO.
SIEGENIA (Germany) provides hardware for casement and tilt-and-turn polygonal windows. The Titan AF series supports sash weights up to 150kg. Components include corner drives, stay arms, and locking bolts. Materials used include galvanized steel and aluminum alloys.
ROTO Frank (Germany) manufactures hardware systems for windows and doors. The Roto NX series is used in polygonal window configurations. Features include multi-point locking mechanisms and anti-pry components. The hardware surface treatment provides corrosion resistance tested for 480 hours in salt spray chambers.
HOPO (China/Global) specializes in hardware for aluminum window systems. Products include handles with ergonomic designs and structural hinges for large polygonal sashes. The hardware is tested for 50,000 cycles of operation.
Polygonal windows from Foshan comply with international certifications for safety, air infiltration, water penetration, and thermal performance.
The AS2047 standard specifies requirements for windows in Australia. Testing includes:
CE marking indicates compliance with EU health, safety, and environmental protection standards. For windows, this involves EN 14351-1. Manufacturers provide a Declaration of Performance (DoP) covering wind load resistance, watertightness, and acoustic performance.
The National Fenestration Rating Council (NFRC) provides energy performance ratings. Data includes:
Polygonal windows include shapes such as triangles, trapezoids, pentagons, hexagons, and octagons. The manufacturing process in Foshan involves specific steps to ensure geometric accuracy.
Profiles are cut using double-head saws or CNC cutting centers. For polygonal shapes, the saws are set to specific angles (miter cuts). CNC machines mill holes for hardware and drainage channels.
Corners are joined using aluminum corner keys and glue. The miter joints must align to within 0.2mm. Two-component polyurethane adhesive is injected into the corner cavities to seal the joint and provide structural rigidity.
Glass units are cut to the shape of the frame. Glazing gaskets made of EPDM are installed around the perimeter. Silicone sealant is applied to the joints to prevent water ingress.
Prices are quoted in USD per square meter (m²) on an Free On Board (FOB) basis from Foshan ports.
| Window Type | Profile Spec | Glass Spec | Hardware | FOB Price (USD/m²) |
|---|---|---|---|---|
| Fixed Triangle | 6063-T5 (1.4mm) | 5mm+12A+5mm Tempered | N/A | 140 - 180 |
| Fixed Trapezoid | 6063-T5 (1.8mm) | 6mm+12A+6mm Low-E | N/A | 160 - 210 |
| Casement Hexagon | 6063-T5 (2.0mm) | 5mm+15A+5mm Tempered | HOPO | 220 - 280 |
| Tilt & Turn Polygon | 6063-T5 (2.5mm) | 6mm+12A+6mm+12A+6mm | SIEGENIA | 320 - 450 |
| Fixed Octagon | 6063-T5 (3.0mm) | 8mm+12A+8mm Tempered | N/A | 280 - 360 |
Prices vary based on quantity, dimensions, and specific glass coatings. Shipping costs and taxes are not included.
Glass selection affects the thermal and acoustic properties of the window system.
Tempered glass is processed by heat treatment to increase strength. If broken, it shatters into small granular pieces. Standard thickness: 5mm, 6mm, 8mm, 10mm.
Low-Emissivity (Low-E) glass has a microscopically thin coating that reflects infrared energy. This reduces heat gain in summer and heat loss in winter.
IGUs consist of two or three panes of glass separated by an aluminum or warm-edge spacer. The gap is filled with dry air or Argon gas. Spacer widths include 6mm, 9mm, 12mm, 15mm, and 20mm.
Installation of polygonal windows requires alignment and sealing to maintain performance.
The rough opening must be measured at multiple points due to the angular nature of the frame. Tolerances for the opening are typically +5mm to +10mm larger than the window frame dimensions.
Frames are secured using stainless steel screws or installation brackets. Fixings are placed every 300mm to 600mm along the perimeter, with extra fixings near the corners.
Polyurethane foam is injected into the gap between the frame and the wall for insulation. The exterior joint is sealed with neutral-cure silicone sealant to prevent water penetration.
A maintenance program ensures the operation of the window system over time.
Aluminum frames and glass should be cleaned every 3 to 6 months using water and mild detergents. Avoid abrasive materials that can damage the surface finish (powder coating or anodizing).
Moving parts of the hardware (hinges, locks, rollers) require lubrication once a year. Use acid-free oils or silicon-based sprays.
EPDM gaskets should be inspected for cracks or shrinkage every 2 years. Replace damaged gaskets to maintain airtightness.
| Profile Series | Wall Thickness (mm) | Max Wind Pressure (Pa) | Deflection Limit |
|---|---|---|---|
| 50 Series | 1.4 | 2000 | L/300 |
| 65 Series | 1.8 | 3500 | L/300 |
| 80 Series | 2.0 | 5000 | L/300 |
| Glass Configuration | STC Rating (dB) | Frequency Range (Hz) |
|---|---|---|
| 5mm + 12A + 5mm | 32 | 100 - 5000 |
| 6mm + 12A + 6mm | 35 | 100 - 5000 |
| 6mm + 0.76PVB + 6mm | 38 | 100 - 5000 |
A manufacturer in Foshan supplied 500 units of polygonal windows for a residential development. The project required triangular and trapezoidal frames. Material used: 6063-T5 aluminum with 1.8mm wall thickness. Thermal break: PA66GF25 (24mm). Hardware: ROTO NX. The windows underwent testing for AS2047 compliance, achieving a water resistance rating of 450 Pa and a wind load rating of 3000 Pa. Production time was 45 days. The units were packed in wooden crates and shipped via Shenzhen port.
Packaging protects the windows during sea freight and land transportation. Methods used by Foshan manufacturers include:
Loading plans are calculated to maximize container space (20GP, 40GP, or 40HQ). Shipping documentation includes Bill of Lading, Packing List, Commercial Invoice, and Certificate of Origin.
Manufacturers use CAD (Computer-Aided Design) software to create shop drawings for polygonal windows. These drawings include cross-sections of the profiles, hardware positions, and miter joint details. The data is exported to CNC machines for precision manufacturing. Shop drawings are provided to the client for approval before mass production begins.
The geometry of polygonal windows affects the distribution of loads. Engineering calculations determine the required moment of inertia for the aluminum profiles. For large spans, steel reinforcements are inserted into the aluminum cavities. Calculations consider local wind codes (e.g., AS1170.2 for Australia or ASCE 7 for the USA).
Aluminum profiles for polygonal windows undergo surface treatments to resist corrosion and UV radiation. Methods used in Foshan include powder coating, anodizing, and fluorocarbon (PVDF) coating.
Powder coating involves the application of a dry powder (typically polyester or polyurethane) to the aluminum surface using an electrostatic process. The profiles are then cured in an oven at temperatures between 180°C and 200°C. This process creates a layer with a thickness of 60 to 80 microns. Standard colors are based on the RAL color chart.
Anodizing is an electrochemical process that increases the thickness of the natural oxide layer on the aluminum surface. This layer is integrated with the metal substrate. Thickness grades include Class 10 (10 microns), Class 15 (15 microns), and Class 25 (25 microns). Anodized finishes are used in coastal environments to resist salt spray.
Fluorocarbon (PVDF) coating consists of a resin containing fluorine. It is applied in two or three layers with a total thickness of 35 to 45 microns. PVDF provides resistance to chemical exposure and color fading under sunlight.
The integrity of a polygonal window depends on the performance of its sealing components. Materials such as EPDM and silicone are used.
Ethylene Propylene Diene Monomer (EPDM) is a synthetic rubber. It maintains its physical properties across a temperature range of -40°C to +120°C. EPDM resists ozone, weathering, and heat. In polygonal windows, gaskets are extruded to match the profile shape. Corner joints of gaskets are vulcanized or glued to ensure continuity.
Neutral-cure silicone sealants are used for perimeter sealing and glass installation. These sealants bond to aluminum and glass without causing corrosion. Properties include a movement capability of +/- 25% to +/- 50% and a service life of over 20 years. Tensile strength and elongation at break are measured during testing.
Manufacturers maintain internal laboratories to test window performance before third-party certification.
A testing rig applies water spray at a rate of 4 liters per minute per square meter while increasing air pressure. For polygonal windows, the joints are monitored for leaks. A rating of 450 Pa indicates no water penetration at that pressure level.
This test measures the volume of air passing through the window unit at pressures of 75 Pa, 150 Pa, and 300 Pa. The result is expressed in cubic meters per hour per square meter (m³/h·m²). Low air leakage improves the energy efficiency of the building.
Static and dynamic air pressure is applied to the window to simulate wind forces. The deflection of the aluminum members is measured. The permanent deformation after the test must remain within specified limits (e.g., 0.2% of the span).
The functionality of polygonal windows relies on the mechanical components that enable movement and security.
Systems from ROTO and SIEGENIA utilize multiple locking points around the sash perimeter. A single handle operates all points simultaneously. This ensures even compression of the gaskets, which is critical for the air and water performance of irregular shapes like trapezoids.
Friction stays are used in casement and awning windows to hold the sash open at various angles. These components are made of 304 or 316 grade stainless steel. The weight capacity of the stays must match the weight of the glass and aluminum frame.
In polygonal windows with non-90-degree angles, specialized corner drives are used to transmit motion from the handle to locking points on adjacent sides. These drives are designed to operate at angles ranging from 30 to 150 degrees.
Coatings applied to the glass surface determine the solar and thermal characteristics of the window.
A single layer of silver is sputtered onto the glass. This provides a balance between light transmission and heat reflection. Emissivity: < 0.10.
Two layers of silver are used, providing a lower Solar Heat Gain Coefficient (SHGC) while maintaining high visible light transmission. This is used in regions with high solar radiation.
Three layers of silver provide the highest level of heat rejection. This is used for buildings with large glass areas to reduce the cooling load on HVAC systems.
Efficient shipping requires calculations for volume and weight.
A 20-foot General Purpose container has an internal volume of approximately 33 cubic meters. For polygonal windows packed in crates, the capacity is typically 100 to 150 square meters of product.
A 40-foot High Cube container has a volume of approximately 76 cubic meters. It can accommodate 250 to 350 square meters of windows. The weight limit for shipping is usually 21 to 26 metric tons depending on the destination and shipping line regulations.
Manufacturers in Foshan follow quality control procedures at each stage of production.
Polygonal windows from Foshan manufacturers provide solutions for architectural projects requiring specific geometric shapes. The use of 6063-T5 aluminum, PA66GF25 thermal breaks, and hardware from SIEGENIA, ROTO, and HOPO ensures the performance of the units. Compliance with AS2047, CE, and NFRC standards enables these products to meet the requirements of international markets. The 2026 price list serves as a reference for project budgeting.
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