Copper and aluminium solve different problems. Choosing correctly at the sourcing stage saves cost, weight and rework downstream. Here is a practical comparison for buyers specifying non-ferrous metal.
Conductivity versus weight
Copper has substantially higher electrical conductivity than aluminium by volume, which is why it dominates conductors, windings and busbars where performance per cross-section matters. Aluminium, at roughly one-third the density, wins wherever weight or cost-per-metre is the priority — overhead lines, heat sinks and lightweight structures.
Cost and price stability
Aluminium is generally cheaper per tonne and less volatile than copper. For high-volume parts where conductivity is adequate, moving from copper to aluminium can materially reduce landed cost — provided the design accommodates the larger cross-section aluminium needs to carry the same current.
Corrosion and durability
Aluminium forms a self-protecting oxide layer and performs well outdoors and in many chemical environments. Copper is highly durable and naturally antimicrobial, but needs care where galvanic contact with dissimilar metals is possible. Matching fasteners and connectors to the base metal avoids galvanic corrosion.
Common forms by application
- Electrical & power: copper rod and wire for conductors; aluminium for overhead and weight-sensitive runs.
- Construction: aluminium billets and extrusion stock for profiles, facades and fittings.
- Automotive & casting: aluminium ingots such as ADC12 and LM6 for die casting; copper for connectors and thermal parts.
- Foundries: clean remelt ingots in both metals for predictable, well-behaved charges.
The bottom line
Specify copper when conductivity or thermal performance per cross-section is critical; specify aluminium when weight, corrosion resistance or cost drives the decision. Unsure which fits? Share your application and target specification — we will recommend the metal, grade and form, and quote against it.