Fluorocarbon Alu-Mg-Mn Roofing Sheets are formed from AA3004 aluminium alloy coil and finished with a PVDF coating system. The alloy contains manganese and magnesium for strength and corrosion resistance, while the PVDF topcoat provides long-term colour and surface protection. SENBO sources AA3004 strip from certified mills and carries out incoming inspection on alloy composition, temper, and coating weight before roll forming. The production line includes regular checks on rib geometry and panel width to keep profiles within specification.
The aluminium surface is cleaned and chromated before painting to improve adhesion. The PVDF coating is applied on a continuous coil line using a two-coat two-bake, three-coat three-bake, or four-coat four-bake process, depending on the project specification. The front-side dry film thickness is typically 25 μm, while the reverse side receives a service coat. PVDF resin content is maintained between 70% and 80% in the topcoat, which contributes to colour stability and resistance to ultraviolet light.
| Property | Value | Notes |
|---|---|---|
| Base alloy | AA3004 (AlMg1Mn1) | Mn 0.5%–1.2%, Mg 1.0%–1.5%, balance Al |
| Common thickness | 0.7–1.2 mm | 0.7 mm minimum for roofing |
| Typical profiles | YX65-300, YX65-400, YX65-430 | Standing seam; other profiles available |
| Density | 2.73 g/cm³ | About one third of steel |
| Tensile strength | 265 MPa | AA3004 H36 temper |
| Coating type | PVDF fluorocarbon | 2-coat 2-bake or 3-coat 3-bake |
| Topcoat thickness | ≥25 μm | Front side |
| PVDF resin content | 70%–80% | In topcoat formulation |
| Design service life | >30 years | For coating and substrate |
| Fire rating | Class A1 | Non-combustible |
PVDF coatings resist ultraviolet degradation better than polyester or SMP finishes. In QUV and xenon arc testing, the coating retains gloss and colour far longer than conventional paints. The 70% to 80% PVDF resin content prevents chalking and fading, which keeps the roof looking new for decades. The coating system is specified for projects where long-term appearance matters, such as airport terminals and high-profile public buildings.
Aluminium naturally forms an oxide layer that slows further corrosion. The PVDF coating adds another barrier against chlorides and industrial pollutants. Salt spray testing shows that fluorocarbon-coated AA3004 panels outperform standard aluminium sheet by a factor of three and stainless steel by a factor of two in terms of surface degradation over the same period. This makes the material suitable for buildings near the coast or in chemical processing areas.
The density of aluminium is 2.73 g/cm³, while AA3004 in H36 temper reaches a tensile strength of 265 MPa. Compared with steel, the panel system reduces dead load by about two-thirds for the same coverage area. Lighter roof structures allow longer spans and smaller supporting members, which can lower overall construction cost. The material also handles thermal movement well due to its lower elastic modulus compared with steel.
The PVDF coating can be matched to RAL or Pantone references, or custom colours can be formulated. Available finishes include solid colours, metallics, and textured effects. The coating is applied before roll forming, so the colour wraps the panel profile uniformly. For projects that require a specific visual identity, the coil can be painted in small batches to match the architect's sample.
PVDF contains a much higher proportion of fluoropolymer resin, which gives better UV resistance and colour retention. Polyester is less expensive but tends to fade and chalk earlier. For roofs that must maintain appearance for more than 20 years, PVDF is the usual choice.
Yes, the coating is flexible enough to withstand normal roll forming and bending. The minimum bend radius depends on the alloy temper and coating thickness. The supplier should confirm the forming limit before the panels are produced.
The surface is low maintenance. Periodic inspection of flashings, penetrations, and seam conditions is recommended. Dirt can be removed with mild detergent and water. Avoid abrasive cleaners that could damage the coating.
The roof build-up normally includes a vapour control layer on the warm side of the insulation to prevent condensation. The specific layers depend on building use and climate. The roof system designer should specify the complete build-up.
Material certificates should confirm the alloy grade, temper, mechanical properties, and coating type. During production, thickness and profile dimensions are checked at regular intervals. For large projects, the coil coating can be tested for adhesion, gloss, and colour difference before shipment. On-site receiving should verify the panel profile, colour, and surface condition against the order.
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