Copper vs Brass
Pure copper has the highest electrical and thermal conductivity of any common metal. Brass — copper alloyed with zinc — sacrifices some conductivity for much better machinability, hardness, and cost-effectiveness.
Side-by-side comparison
| Attribute | Copper | Brass |
|---|---|---|
| Composition | 99%+ copper | 55–95% copper, balance zinc |
| Density | 8.96 g/cc | 8.40–8.73 g/cc |
| Electrical conductivity | 100% IACS (baseline) | 25–40% IACS |
| Thermal conductivity | Excellent | Good |
| Machinability | Difficult (gummy) | Excellent (free-cutting) |
| Hardness | Soft | Harder |
| Cost | Higher | Lower (zinc is cheap) |
| Common uses | Wiring, busbars, heat exchangers, plumbing tube | Fittings, valves, decorative, machined parts |
When to choose Copper
Choose copper for electrical conductors, busbars, heat exchangers, refrigeration tubing, and earthing — anywhere conductivity is paramount.
Buy Copper on MetaleMartWhen to choose Brass
Choose brass for plumbing fittings, valves, decorative hardware, and machined parts where conductivity is secondary to cost and machinability.
Buy Brass on MetaleMartFrequently asked questions
Is brass a good conductor of electricity?
Yes, but only 25–40% as conductive as pure copper. Use copper for high-current electrical work.
Why is copper plumbing tube common but brass plumbing fittings common?
Copper tube is easier to bend and solder. Brass fittings are easier to machine into threads, valves, and complex shapes.
Which corrodes faster?
Both develop a protective patina rather than corroding. In drinking water, both are safe and long-lasting.