The primary materials utilized in the construction of metal curtain walls encompass a variety of options, including aluminum composite panels, single-layer aluminum sheets, aluminum honeycomb panels, fireproof boards, titanium-zinc-plastic aluminum composite panels, insulated sandwich aluminum panels, stainless steel sheets, color-coated steel sheets, and enameled steel sheets. These materials offer diverse properties that cater to different architectural needs and design preferences.
Aluminum Composite Panels
These panels consist of an inner and outer layer of 0.5mm-thick aluminum sheeting, sandwiched around a core made of 2-5mm-thick polyethylene or rigid polyethylene foam board. The exterior surfaces are coated with fluorocarbon resin, which creates a durable and resilient film. This coating ensures excellent adherence and longevity, offering a wide range of colors. Additionally, the rear side of the panel is coated with polyester paint to prevent potential corrosion. Aluminum composite panels have historically been a popular choice for the exterior facades of buildings due to their versatility and ease of maintenance.
Single-Layer Aluminum Sheets
These panels are crafted from aluminum alloy sheets with a thickness of either 2.5mm or 3mm. Similar to aluminum composite panels, the surface of single-layer aluminum sheets used for exterior curtain walls is coated with fluorocarbon resin, providing the same level of toughness, stability, adhesion, and durability. As a result, these panels have become increasingly prevalent in modern metal curtain wall designs, particularly for projects where aesthetics and structural integrity are paramount.
Aluminum Honeycomb Panels
These composite materials combine two aluminum honeycomb layers with a honeycomb core. Depending on the specific requirements of the curtain wall application—such as functionality and durability—the thickness of the honeycomb aluminum panels can vary, typically ranging from 10mm to 25mm. For instance, a 10mm honeycomb aluminum panel might consist of a 1mm front aluminum sheet paired with a 0.5-0.8mm back aluminum alloy sheet and honeycomb core. Panels thicker than 10mm generally use 1mm aluminum alloy sheets. The honeycomb core is usually made of aluminum foil, though other materials like glass fiber-reinforced plastic honeycomb or paper honeycomb are occasionally used, though they are less common in practice. Due to their relatively high cost, honeycomb aluminum panels are not as widely used as other alternatives.
Fireproof Panels
Fireproof panels are constructed using a metal sheet (such as aluminum, stainless steel, color steel, titanium-zinc, titanium, or copper) as the outer layer, with a halogen-free, flame-retardant inorganic material forming the core layer. These panels are manufactured through a hot-pressed composite process and classified under GB8624-2006 standards into two combustion performance categories: A2 and B. Their fire-resistant properties make them ideal for applications where safety and compliance with building codes are critical.
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