Alu-Mg-Mn Roofing Panelss are roll-formed from AA3004 aluminium alloy strip for standing seam roof and wall systems. The alloy contains manganese and magnesium, which together improve strength and corrosion resistance while keeping the material light enough for long-span roofs. SENBO checks the incoming alloy grade, temper, and coating thickness before roll forming, and the production line monitors rib height and panel width at regular intervals. This helps keep the finished profile within the specified tolerance.
The Alu-Mg-Mn Roofing Panel surface is coated before forming with a PVDF fluorocarbon system containing at least 70% fluorocarbon resin. The coating is applied on a continuous line after cleaning and chromate treatment, which improves adhesion and colour uniformity. The roof system uses a standing seam profile with T-shaped clips. The clips hold the panels to the purlins while allowing movement along the roof slope, so thermal expansion and contraction do not stress the seams. The mechanically locked joint forms a watertight barrier without relying on sealant.
| Item | Value | Basis / Note |
|---|---|---|
| Base alloy | AA3004 (AlMg1Mn1) | Mn 1.0–1.5%, Mg 0.8–1.3%, balance Al |
| Thickness | 0.7–1.2 mm | 0.6 mm possible for corrugated profiles |
| Common profiles | YX65-300, YX65-430, YX65-500 | Standing seam; custom sections available |
| Density | 2.73 g/cm³ | About one third of steel |
| Tensile strength | 240–285 MPa | H36/H46 temper |
| Yield strength | ≥190 MPa | Minimum |
| Elongation | ≥3% | At break |
| Thermal expansion coefficient | 0.000023 /°C | 20–100°C |
| Fire rating | A1 | Non-combustible |
| Service life | >50 years | Coating warranty 15–20 years |
| Relevant standards | GB 50345, GB 50207, EN 573-3 | Design and material references |
The density of aluminium is 2.73 g/cm³ compared with 7.85 g/cm³ for steel. A roof made from AA3004 panels therefore weighs about one third as much as an equivalent steel roof. This reduction in dead load can reach 30% for the overall roof structure, which allows smaller purlins, columns, and foundations. The tensile strength of 240 to 285 MPa is sufficient for standing seam profiles and for panels that must resist wind uplift over long spans.
When exposed to air, aluminium develops a dense oxide film that protects the base metal from further oxidation. Testing indicates an annual corrosion loss of about 0.5 micrometres in normal atmospheric conditions. A 0.7 mm panel would still have about 0.65 mm of thickness after 100 years. The PVDF coating adds another protective layer against industrial pollution and salt spray. These factors support a design life beyond 50 years for the base metal.
The standing seam system uses sliding T-clips that let each panel move along the roof slope while staying connected to the purlins. This prevents stress buildup at fixed points and avoids panel deformation. Single panels can be produced up to 120 metres long without end laps, which removes potential leak paths and improves overall watertightness. Installation tolerance is controlled within 3 mm, and the prefabricated system shortens construction time by more than 30% compared with traditional methods.
The roof system achieves a Class A1 fire rating. Aluminium melts at 660°C, and in a fire the roof tends to burn through locally rather than spreading flame across the surface. This helps firefighting efforts by allowing heat and smoke to escape. For lightning protection, panels at least 0.7 mm thick can act as air termination devices under GB 50057, which removes the need for separate lightning rods and additional roof penetrations.
AA3004 contains more manganese and magnesium, which gives higher strength and better corrosion resistance. It is often chosen for standing seam roofs that must handle higher wind loads or longer spans without increasing panel thickness.
Yes, the alloy can be roll-formed or press-braked into curved shapes. The minimum radius depends on the panel profile, material temper, and coating thickness. The supplier should confirm feasibility before the panels are fabricated.
A slope of 5% is standard for most details. Lower slopes may be possible with continuous panels and careful sealing, but the project engineer must verify the design for the local rainfall intensity and wind conditions.
A vapour control layer is normally included on the warm side of the insulation to prevent condensation inside the roof build-up. The exact layers depend on building use and climate. The roof system designer should specify the complete assembly.
Material certificates should confirm the alloy grade, temper, mechanical properties, and coating type. Production checks cover panel width, rib height, and length. For large projects, samples can be tested for coating thickness and adhesion. On-site receiving should verify the panel count, profile, and surface condition before installation starts.
Address
No. 17 Guanghai Road, Jinghai Economic Development Zone, Tianjin, China
Tel
