Aluminium Alloy 3105: Painted & coated sheet alloy.
A 3xxx alloy with added magnesium, optimised for pre-painted, colour-coated and roll-formed architectural sheet, including roofing, siding, gutters and rainscreen.
What is Aluminium Alloy 3105?
Aluminium Alloy 3105 is a manganese–magnesium aluminium alloy optimised for pre-painted, colour-coated and roll-formed architectural sheet. Manganese supplies moderate strength while magnesium improves paint adhesion, dent resistance and forming behaviour. 3105 is non-heat-treatable; tempers are developed by cold rolling. It is the most widely used coil substrate for architectural cladding, roofing, rainscreen, gutters and flashings worldwide.
3105 is supplied predominantly as coated coil (PE, PVDF, plastisol). It roll-forms, brake-bends and trims cleanly. Welding is rarely required in its target applications but follows standard 3xxx practice.
Chemical & mechanical data.
Chemical composition
Mechanical properties
How 3105 performs.
Six performance dimensions, rated 1 to 5, to help architects, fabricators and engineers specify with confidence.
Where 3105 is specified.
- Pre-painted roofing & cladding coil
- Rainscreen and façade systems
- Gutters, downpipes and flashings
- Mobile-home and trailer side sheet
- Chequered & tread plate (light-duty)
- Bottle caps and closures
Advantages
- Engineered for paint, PVDF and powder-coat finishes
- Excellent roll-forming and bending behaviour
- Better dent resistance than 1100 / 3003
- Excellent corrosion resistance in architectural exposure
Limitations
- Not heat-treatable
- Strength still moderate; not a structural alloy
3105 is supplied to:
- ASTM B209
- EN 485-2
- EN 573-3
Supplied to customer requirement.
Alloy 3105 is available in a full range of thicknesses according to customer requirement, with cut-to-length, slitting and custom configuration on request. Mill test certificates (EN 10204 3.1) are issued with every consignment.
Related aluminium alloys.
Manganese alloy: general purpose
The workhorse aluminium alloy. Approximately 20 % stronger than 1100 with the same excellent formability, specified for cladding, roofing, ducting and general sheet-metal fabrication.
Architectural anodising alloy
A low-magnesium 5xxx alloy specifically formulated for bright, even anodising. The benchmark sheet for architectural cladding and decorative trim.
European architectural & automotive sheet
The European 5xxx benchmark for tread plate, architectural cladding and automotive body panels, with excellent corrosion resistance, formability and weld response.
Send your 3105 requirement.
Tell us form (sheet / coil / plate / bar), temper, dimensions and tonnage. We will revert with mill availability and indicative pricing within one working day.