Which type of brasses are specified for terminal posts used in signalling and ancillary equipment in the London Underground?

The following brasses have sufficient strength, machinability and electrical conductivity:

CW508L (CZ108), CW509L (CZ109) and CW614N (CZ121).

Why are copper and copper alloys used in coinage?

Since ancient times copper has been used in coins; the Romans used copper widely in this application. The reasons for using copper are its excellent corrosion resistance, ease of stamping, good electrical conductivity for vending machines and ease of recycling.

Why is copper so efficient in heat exchanger applications?

Because the thermal conductivity is so high – it is 23 times better than stainless steel or titanium and 1.6 times better than aluminum.

What is the history of copper tubes with aluminium fins?

Condenser coils with round copper tubes and aluminium fins have been a winning combination for ACR coils for many years. Manufacturers enjoy the assembly advantages provided by these components while technicians find it easy to join and repair copper tubing in the field. More importantly, this well established technology has a proven record of durability in the field resulting in a high level of customer satisfaction.

What is the main advantage of small diameter tubes for the design of air conditioner coils?

Smaller diameter tubes allow for more effective heat transfer.

What is the melting point of copper?


What is the minimum pitch for long strip copper roofing?

3 degrees.

What is the minimum pitch for traditional copper roofing?

1 degree, using batten rolls.