ACP facade panels are thin aluminum composite sheets consisting of two coil-coated aluminum skins bonded to a polymer or mineral-filled core. At 3-6 mm total thickness with 0.4-0.5 mm aluminum skins, they provide a rigid, flat cladding surface for building exteriors at a fraction of the weight of solid aluminum plate, while accepting complex fabrication including routing, bending, and perforation for shaped facade elements.
The PVDF fluorocarbon roller coating applied to the aluminum skins delivers long-term color retention and chalk resistance under UV exposure. Core selection determines the panel’s fire behavior: standard LDPE cores suit interior and low-rise applications, while fire-retardant mineral-filled cores (70-90% mineral content) achieve A2 classification per EN 13501-1 for high-rise and public building facades where building codes restrict combustible cladding.
Panels measure 1,220 mm or 1,500 mm wide with standard lengths from 2,440 mm to 4,880 mm and custom lengths up to 6,000 mm. Available finishes include solid RAL colors, metallic effects, wood grain, stone patterns, mirror, and brushed textures, all applied by continuous coil coating for uniform appearance across large facade areas.
Your Trusted Manufacturer for ACP Facade Panel
RaxPanel manufactures ACP facade panels in Hebei, China, on a continuous lamination line where coil-coated aluminum sheets bond to extruded core material under heated nip rollers. The process differs fundamentally from batch-press lamination: line speed, roller temperature, and nip pressure must remain within tight windows to achieve consistent peel strength above 5 N/mm across the full coil length. We monitor peel adhesion by T-peel test on samples cut from each coil head and tail.
The coil coating line applies PVDF primer and topcoat in a multi-pass roller coater with inline film-thickness gauges. Coating adhesion is verified by cross-hatch tape test (ASTM D3359) and MEK rub resistance (minimum 100 double rubs) before the coated coil is released to the lamination line. For FR mineral cores, the mineral-filled polymer compound is extruded as a continuous sheet and laminated between the pre-coated aluminum skins in a single pass.
Dimensional accuracy on the finished panel is checked by flatness gauge and edge-straightness measurement. Panels are cut to length by flying shear, stacked with interleaving PE film, and packed in timber crates sized for container loading. Each crate is labeled with project reference, elevation zone, and panel sequence number for direct-to-site distribution.
| المعلمة | القيمة |
|---|---|
| مادة الجلد | PVDF-coated Aluminum Alloy (3003, 5005, 5052) |
| Skin Thickness | 0.4-0.5 mm |
| مادة القلب | LDPE / FR Mineral-filled / Mineral Polymer |
| Core Composition | FR: 70-90% mineral (MgOH, AlOH); LDPE: 100% polymer |
| Panel Thickness | 3-6 mm (standard: 4 mm) |
| Standard Width | 1,220 mm / 1,500 mm |
| Standard Length | 2,440 / 3,200 / 4,100 / 4,880 mm |
| الحد الأقصى للطول | 6,000 mm |
| Panel Weight | 5.5-6.5 kg/m² (4 mm panel) |
| Coating Type | PVDF (70% resin) / Nano / FEVE / PE |
| Peel Strength | > 5 N/mm (ASTM D1781) |
| Tensile Strength | 80-100 MPa |
| Flexural Strength | > 100 MPa |
| Fire Rating | A2 (FR mineral); B1 (LDPE); B2 (PE) per EN 13501-1 |
| Service Temperature | -50°C to +80°C |
ACP Facade Panel Engineering Guide: Core Selection, Coating Lifecycle & Fabrication Limits
Aluminum composite panels occupy a specific niche in facade engineering: they deliver the flatness and rigidity of solid aluminum plate at roughly one-third the weight and cost, while accepting fabrication geometries (tight-radius bends, routed fold-backs, perforated screens) that solid plate cannot achieve economically. The specification decisions that drive project outcomes are core grade selection, coating system choice, and fabrication method compatibility.
1. Core Grade Selection: Matching Fire Requirements to Building Height
Building codes in most jurisdictions tie cladding combustibility restrictions to building height and occupancy type. For structures above 10 m or with public assembly occupancy, non-combustible or limited-combustibility cladding is typically mandated. FR mineral-filled cores (70-90% magnesium hydroxide and aluminum trihydroxide by weight) achieve A2-s1,d0 per EN 13501-1, satisfying these requirements. Standard LDPE cores (B2 classification) are restricted to interior linings, signage, and low-rise residential applications where codes permit combustible cladding.
2. Coating System Comparison and Expected Service Life
The coating system determines long-term facade appearance. PVDF at 70% resin concentration provides 25+ years of color retention per AAMA 2605, with chalk resistance and gloss stability under tropical UV exposure. Nano-PVDF coatings add a hydrophilic top layer that sheds dust and pollutants with rainfall, extending cleaning intervals in polluted urban environments. FEVE coatings offer 10-12 years of service at lower cost for mid-rise commercial projects. PE coatings (5-7 years) are limited to interior or short-life temporary installations.
3. Fabrication Methods and Minimum Bend Radii
ACP panels are fabricated by routing (V-groove or U-groove), folding, cold-bending, and CNC cutting. The minimum cold-bend radius is approximately 2 times the panel thickness (8 mm for a 4 mm panel) without core cracking. For tighter radii, V-groove routing removes core material along the fold line, leaving a thin aluminum hinge that folds cleanly. Perforated screens and decorative patterns are produced by CNC punch or laser cutting. All fabrication must account for thermal expansion: aluminum expands approximately 2.4 mm per meter over a 100-degree-Celsius temperature swing.
4. Substructure and Fixing Systems
ACP cassettes (folded-edge panels) attach to aluminum or galvanized steel sub-frame rails using rivets, screws, or structural adhesive depending on the system. Open-joint rainscreen designs leave a 10-20 mm gap between panels with no sealant, relying on the cavity behind for pressure equalization and moisture drainage. Closed-joint systems use silicone sealant or EPDM gaskets at panel edges. Adhesive-bonded systems (using structural tapes or two-component adhesives) eliminate visible fixings for seamless facade appearance but require surface preparation and temperature-controlled application.
5. Thermal Movement and Joint Design
A 4,880 mm ACP panel expands approximately 9 mm over a -20 to +60 degree-Celsius annual temperature range. Joint widths must accommodate this movement without buckling or sealant failure. Standard practice specifies 10-15 mm open joints for rainscreen systems, or 6-8 mm sealed joints with low-modulus silicone that tolerates 25% joint movement. Vertical joints align with substructure rails; horizontal joints align with floor lines or spandrel bands to create visual rhythm on the elevation.
الأسئلة الشائعة
1. What is the weight difference between ACP and solid aluminum plate for the same facade area?
A 4 mm ACP panel weighs 5.5-6.5 kg/m² compared to 10.8 kg/m² for a 4 mm solid aluminum sheet. This 40% weight reduction decreases substructure steel tonnage, reduces crane time during installation, and lowers transportation costs. For a 5,000 m² facade, the weight saving translates to approximately 25-30 tonnes less material to transport and hoist.
2. How do I verify that FR mineral core panels meet the fire classification claimed?
Request the EN 13501-1 test report from an accredited laboratory (such as Warringtonfire, Efectis, or equivalent) showing A2-s1,d0 classification for the specific panel construction (skin thickness, core formulation, total thickness). The report should reference the exact product configuration being supplied. Additionally, verify that the mineral content is 70-90% by requesting the manufacturer’s core composition data sheet. Generic “fire-rated” claims without a named test report and specific configuration are insufficient for code compliance documentation.
3. Can ACP panels be used for curved or double-curved facade geometries?
Single-axis curves (cylindrical bends) are achieved by cold-bending to a minimum radius of 2x panel thickness, or by segmenting the curve into flat facets joined at angled fold lines. Double-curved surfaces require hydroforming or multi-point die pressing, which is feasible but adds fabrication cost. For radii below 100 mm, V-groove routing along the bend line prevents core cracking. The aluminum skins retain their shape after forming, so no springback compensation is needed for radii above 50 mm.
4. What is the difference between open-joint and sealed-joint ACP facade systems?
Open-joint rainscreen systems leave 10-20 mm gaps between panels with no sealant, relying on a drained and ventilated cavity behind the panels for weather protection. They eliminate sealant maintenance cycles (typically 10-15 years for silicone) and allow free thermal movement. Sealed-joint systems use silicone or gaskets for a flush, monolithic appearance but require periodic sealant inspection and replacement. Open-joint is preferred for high-rise and coastal applications; sealed-joint suits interior linings and low-rise commercial buildings.
5. How should ACP facade panels be cleaned and maintained?
PVDF-coated ACP requires washing with neutral pH detergent and soft cloth or low-pressure water (below 1 MPa) at 1-2 year intervals in normal atmospheres, or annually in coastal and industrial zones. Avoid abrasive pads, alkaline cleaners (pH above 9), and solvent-based products that attack the coating. Nano-coated panels extend cleaning intervals to 3-5 years due to their hydrophilic self-cleaning surface. Inspect sealant joints (if present) every 5 years and replace degraded silicone before water ingress reaches the substructure.
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