Copper is stronger than aluminum, heavier than brass. Has natural metallic tones ranging from reddish to silvery. Softer than other metals, easy to etch with precision results. Extremely resistant to corrosion. Has superb electrical and thermal conductivity. Possible green discoloration over time.
Premium steel grade. Corrosion-resistant, durable, heatproof steel, more expensive than tinplate and aluminum. Stronger and harder to form than aluminum. 5 or 6% heavier than mild steel. 304 grade is salt-corrosive, may discolor and rust in long-time weathering. For harsh conditions use grade 316.
Brass, a man-made alloy (copper/zinc), has more resistance to corrosion than copper but is not as resistant as bronze. Can crack much more easily than bronze or copper. Looks similar to gold. Has antimicrobial and germicidal properties. Lighter in weight than cupper