Aluminium is widely used in architectural façade systems due to its durability, versatility and aesthetic appeal. However, its different grades make it suited for various purposes.
In a nutshell:
• 1050 is essentially pure aluminium which can be shaped into bespoke designs; however it is unsuitable for anodising.
• 55HX and J57S grades are better suited to anodising and offer great corrosion resistance.
• Grades within the same series can have different properties and yield different results to anodising.
• 55HX is more malleable than J57S so it is frequently used for expanded mesh.
• After anodising, JS7S yields a shinier finish whereas 55HX produces a more matte finish.
• The chemical build-up of 6063 means it can be anodised and is a popular choice for extrusions.
Ultimately, any aluminium grade can be used to create architectural façade elements. However, the intended purpose, aesthetic and performance of the façade have a direct impact on which grade is most suitable for the project.
Aluminium 1050
Aluminium 1050 is a popular choice for architectural façade panels as it is a cost-effective option that also provides a sleek, reflective finish. The durability and malleability of aluminium also means this grade can be twisted and folded for bespoke façade designs.
Conversely, this grade is unsuitable for anodising so must be powder coated. Therefore, if the façade is specified to be A1 fire-rated, it’s not a suitable option. This also means it isn’t suited for projects in marine environments.
Aluminium 55HX and J57S
Aluminium 55HX and J57S are aluminium alloyed with magnesium and are often labelled 'marine grade' due to their impressive corrosion resistance. This makes 55HX and J57S brilliant options for façade panels in corrosive environments such as near seasides and rivers. Also, unlike aluminium 1050, these grades are suited to anodising meaning they can both achieve an A1 fire rating.
It’s important to note that different grades within the same series can possess varying properties. For example, 55HX is more malleable and is often used for expanded mesh and when anodised it produces a more matte metallic finish. J57S on the other is more brittle and yields a shinier finish after anodising.
Aluminium 6063
Aluminium 6063 includes magnesium and silicon and is frequently referred to as the ‘architectural alloy’ because it’s chemical build-up makes it a popular choice for extrusions.6063 can extrude small and intricate shapes, such as those in bespoke façade designs, and can be anodised, providing a transparent A1 finish with good corrosion resistance.
Though they’re predominantly used for extrusions, they can also be used for façade panels.