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Old 06-14-2017, 10:01 PM   #1
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Default how many shades?

of copper have you seen lately on new wire? the past several months ive noticed many shades of copper color on new rolls(mainly romex) sometimes its three different shades on one roll. dont recall ever seeing this before. lack of heat control at the factory?
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Old 06-14-2017, 10:04 PM   #2
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Quote:
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of copper have you seen lately on new wire? the past several months ive noticed many shades of copper color on new rolls(mainly romex) sometimes its three different shades on one roll. dont recall ever seeing this before. lack of heat control at the factory?
I do see it once awhile when see all three diffrent shade of copper color on it .,


more specfially manufacter quanty control some do run new copper and some run recycled copper which it can show differnt shade of color there.
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Old 06-14-2017, 10:09 PM   #3
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It seems to be all over the place, doesn't matter manufacturer or supplier...

I have had a lot that looks like it is years old, or has been exposed to water for long periods, yet is off the shelf new.
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Old 06-14-2017, 10:37 PM   #4
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Red China has ASTOUNDING amounts of wire bar in its inventory.

This is now being liquidated.

The wire bar from different players... especially in Red China... is a tad different.

I'm presuming here, that the wire bar has been imported from Red China and processed here.

&&&

Wire bar is the industry term for de-oxygenated copper that is milled as blanks suitable for wire forming without further chemical processing.

Wire is formed by taking wire bar up to high temperature -- but well below melting -- in an inert atmosphere -- and pressing the now soft metal through an initial die. This die will typically have more than one portal, so that multiple strands will originate in parallel. Cold copper would just destroy the die too quickly.

At this stage the copper is pretty thick, and mighty hot, so it passes through an inert gas... take your pick... then a liquid coolant. (typ.)

It is then placed under tension and pulled through an extensive series of dies... in a well lubricated state... to provide the strands we all know and love. ( There are a whole range of wire forming machines, of course. The first goal is strand copper. Then the strands are later compounded to form everything from tiny to huge.)

Any color shift in the final product may reflect a host of factors, including the cooling lubricant in the last chain-process step.

Cut off some cable and stare straight at the end. If that shows color consistency, then the odds favor that the coolant has dyed the exterior of the wire... or the dies have 'burnt' the copper with the coolant. This last event would be due to running the machine full tilt with old coolant.

Changing over and flushing out cost money.

And right now, the copper wire industry is facing deflation, ruinous deflation.

So I'd guess that the machines are working full tilt, everywhere.

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Old 06-14-2017, 11:00 PM   #5
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figured it was a change process = less quality control
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Old 06-14-2017, 11:48 PM   #6
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figured it was a change process = less quality control
Yup, quality was something of years gone by.
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Old 06-15-2017, 08:33 PM   #7
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Maybe I am loosing hand strength but it seams like the wire is getting harder also.
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Old 06-15-2017, 09:25 PM   #8
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When i was an apprentice in Scotland we had wire drawing machine for detonator wire....we made the explosives as well...and they referred to red copper or brass copper depending on the contracts we had to produce .
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