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Home/Guides/Material Identification
Material Identification4 min read•October 2026

Copper or aluminium? Simple clues to tell them apart before you sell

Colour, density, weight, and component usage offer immediate clues, but paint, silver plating, and alloys can deceive the eye. Learn reliable ways to distinguish them easily.

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★

Key Takeaways

  • Copper is dense and reddish-orange; aluminium is lightweight and silvery-white.
  • Copper-clad aluminium (CCA) wires look like copper from the outside but reveal a silvery aluminium core when sliced.
  • A simple pocket magnet helps differentiate non-magnetic copper and aluminium from steel.
01

Quick Tests to Differentiate Copper and Aluminium

1. The Scratch Test: Use a knife or file to scrape the surface. If it reveals bright reddish-orange beneath any coating, it is copper. If it is dull silver-gray, it is aluminium.

2. Weight Comparison: Copper is more than three times denser than aluminium. Two pipes of the exact same size will feel noticeably different in hand.

3. Beware of Copper-Clad Aluminium (CCA): Common in cheap audio and network cables, CCA has an ultra-thin copper skin over an aluminium core. Cutting the wire straight across reveals the silvery center.

  • Test 1: Visual cross-section cut
  • Test 2: Weight-to-volume density feel
  • Test 3: Magnet test (neither will stick, but steel casings will)
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Related Guides & Pricing Breakdowns

Browse all guides →
Copper & Pricing

Why do copper scrap prices vary so drastically?

Copper is a premier non-ferrous metal, but the simple word "copper" is never enough to determine a price. Purity grade, insulation jackets, surface oxidation, and attachments all govern true scrap value.

Read guide→
Electrical & Cables

How do you sell cable scrap with fewer guesses?

The most common mistake is assuming every cable has the same scrap price. Internal strand diameter, lead/steel armoring, and insulation thickness dictate the true copper recovery percentage.

Read guide→
Appliances & HVAC

What gives an old AC unit scrap value in Riyadh?

Air conditioners are complex composite units containing copper coils, aluminium radiator fins, electric compressor motors, and sheet steel. Learn how their value is assessed.

Read guide→
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