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Which copper alloy has a good electrical conductivity and retains strength up to 400°C?

Copper chromium (CC101) – conductivity is 80% IACS – strength good up to 400°C.

What effect does heavy cold working have on the electrical conductivity of copper?

It reduces by about 3%.

What is Nordic Gold?

An alloy with 89% copper, 5% aluminium, 5% zinc and 1% tin. 10, 20 and 50 Euro cent coins use this alloy.

What finishes are available for copper?

Bright copper, pre-oxidised copper, pre-patinated copper or post-patinated copper. Copper surfaces can also be supplied embossed, hammered or perforated to offer a textured, or light-changing finish.

Position on Regulation small, medium and large distribution and power transformers

ECI / Leonardo ENERGY, December 2012

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Which copper alloys may be used for the design of springs?

Copper strip and wire may be produced with a combination of high elastic limit and good corrosion resistance, making them an ideal choice for springs. The main groups of alloys are:

  • Phosphor bronze, typically CW451K (PB102) with a yield strength of about 500N/mm2.
  • Nickel silver, typically CW409J (NS106).  This is silver coloured and has excellent tarnish resistance.
  • Copper beryllium CW100C (CB101). This alloy is used where very high yield strength is required (greater than 1000N/mm2). These alloys are expensive and phosphor bronze will be adequate for most engineering applications.

A useful Specification is BS EN 1654:1998 (Copper and copper alloys. Strip for springs and connectors).

What is Bordeaux mixture?

The French scientist Millardet – while seeking a cure for downy mildew-diseased vines in the Bordeaux district of France – chanced to notice that those vines bordering the highways, which had been daubed with a paste of copper sulphate and lime in water in order to make the grapes unattractive to passers-by, appeared freer of downy mildew. This chance observation led to experiments with mixtures of copper sulphate, lime and water, and in 1885 Millardet announced to the world that he had found a cure for the dreaded mildew. This became known as Bordeaux mixture and saw the commencement of protective crop spraying.

Which grade of copper is used for vehicle brake pipes?

Copper and copper-nickel tubes are used for vehicle brake pipes due to their good fatigue and corrosion resistance (especially against salt on the roads), where fluid loss could be disastrous. Because of their ductility, they are easy to fit; they are standard equipment for many cars, fire engines, military vehicles, JCBs and other heavy vehicles.

Koppar - naturens egen byggsten

Koppar är ett utmärkt byggmaterial. Vackert, hållbart och miljöanpassat. Det är vid sidan av trä och sten ett av våra äldsta och mest beprövade byggmaterial, och det mest återanvända byggmaterialet genom tiderna.

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What is meant by ‘more effective’ heat transfer?

The same or better performance can be achieved with less tube and fin material. In other words, more heat can be dissipated with less material. Less tube, more heat! Technically speaking, a coil made with smaller diameter tubes can be designed with a higher ‘heat transfer coefficient’ compared to a coil made with larger diameter tubes.

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).