Copper overhead conductors
Copper overhead conductors are overhead power lines or cables. They are mostly oxidised, which turns them green, and 4–6 mm thick.
Copper swarf arises from copper turning and milling. It is bare metal, and is not oxidised.
Enamelled copper wire
Enamelled copper wire includes winding wire for coils, pull solenoids, relay coils and transformers.
Old copper means used and oxidised or tarnished copper parts. It is also known as “collected copper”.
Bare copper is new, non-oxidised copper sheet without soldered connections.
Granulated pure copper
Granulated pure copper is the end product when insulated copper cables are recycled.
Heavy and old brass
Heavy brass and old brass are the names given to chrome-plated sanitary fittings and other used brass parts.
New brass is the collective term for a group of alloys that mainly consist of copper and zinc. The colour of brass depends on the zinc content, and mostly varies between a lighter yellow and a darker one closer to natural gold. With zinc contents below 20% the colour ranges from brownish to brownish-red, and with contents above 36% it is bright to light yellow.
Brass cartridge cases
Brass cartridge cases may be nickel plated, and may even turn out to be made of iron, instead.
This is a dull silver coloured alloy of iron, chromium and nickel. It is corrosion and acid resistant. It is very tough, and as a result it is hard to work. There are a variety of stainless steel grades. The most widespread grade is 18/8 (18% chrome, 8% nickel and the rest iron), also known as V2A steel. The material number helps us to determine the precise characteristics of the steel.
18/8 stainless steel swarf
18/8 stainless steel swarf comes from turning of 18/8 stainless steel (18% chrome, 8% nickel and the rest iron). Machining may result in the swarf becoming slightly magnetised.
Lead dross is a by-product of lead casting. The dross floats on the surface of the molten metal, together with impurities.
Lead wheel weights
Lead wheel weights with iron clips are used to balance tyres.
Hard lead has a light ring if you drop – unlike soft lead, which makes a dull thud. Antimony is used as an alloying element.