### Question on Copper Purity

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#### Escott1377

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##### Question on Copper Purity
« on: 11 Sep 2018, 01:12 pm »
When copper is listed as 4N, is it 99.99% pure or 99.9999% pure?  I always thought the latter, but was contradicted recently so I figured that I would turn to the experts.

Thanks in advance -

#### Elizabeth

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##### Re: Question on Copper Purity
« Reply #1 on: 11 Sep 2018, 01:30 pm »
Google "what does four N purity mean.. 'four nines' means 99.99%. 2 nines means 99%.
So some wire says 99.9999 that is six nines.
(If you just write in what does four n mean, you get all industrial down time stuff.)

#### Speedskater

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##### Re: Question on Copper Purity
« Reply #2 on: 11 Sep 2018, 03:41 pm »
It doesn't matter any more than does the difference between a 10 foot cord and a 10 foot 1 inch cord matter?

#### jtwrace

##### Re: Question on Copper Purity
« Reply #3 on: 11 Sep 2018, 04:55 pm »
It doesn't matter any more than does the difference between a 10 foot cord and a 10 foot 1 inch cord matter?
That's not what the OP is asking though.

4N = 99.99% as far as I know.

#### charmerci

##### Re: Question on Copper Purity
« Reply #4 on: 11 Sep 2018, 05:20 pm »
That's not what the OP is asking though.

4N = 99.99% as far as I know.

No, but his answer may be relevant in the context of IC's/ speaker cables, power cables etc. given that the OP didn't say why he wanted to know.

#### Speedskater

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##### Re: Question on Copper Purity
« Reply #5 on: 11 Sep 2018, 06:16 pm »
All I could find in an old Belden book:
a] 3 nines copper has 99.95 % purity.
b] the difference between 3 nines and 6 nines copper is about 1.5 %.  But 1.5% of what, I son't know.

#### Escott1377

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##### Re: Question on Copper Purity
« Reply #6 on: 11 Sep 2018, 08:10 pm »
Google "what does four N purity mean.. 'four nines' means 99.99%. 2 nines means 99%.
So some wire says 99.9999 that is six nines.
(If you just write in what does four n mean, you get all industrial down time stuff.)

That satisfies my question.  Posted in this forum b/c yes, it does mostly pertain to cables, etc - thank you all.

#### FullRangeMan

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##### Re: Question on Copper Purity
« Reply #7 on: 11 Sep 2018, 08:22 pm »
Over six nines the sonic improvement is irrelevant, more important is the molecular structure arrangement or oxygen content.
« Last Edit: 11 Sep 2018, 09:53 pm by FullRangeMan »

#### Mike B.

##### Re: Question on Copper Purity
« Reply #8 on: 11 Sep 2018, 09:26 pm »
I believe OFC is 99.99%.  OFC copper is a very good conductor. Be careful with connectors that are advertised as copper. Dead soft copper has little memory and is not satisfactory for contacts. Beryllium copper is a much better substitute but it has the conductivity close to the higher copper content brass.

#### Letitroll98

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##### Re: Question on Copper Purity
« Reply #9 on: 12 Sep 2018, 12:54 pm »
OFC copper is not free of oxygen, it's more like reduced oxygen content and refers to the smelting process used.  6N or 4N or rough pitch copper all refer to the amount of impurities within the copper.  Single crystal or OCC copper refer to the number of grain boundaries within annealed copper wire.  Material is a component of how a cable sounds, but it's usually swamped by geometry, dielectric, and connectors.

#### Mike B.

##### Re: Question on Copper Purity
« Reply #10 on: 12 Sep 2018, 02:49 pm »
I personally think the biggest difference is from the continuous cast over any purity over 99.99%. There are so many things that can and might affect performance.

#### Tyson

##### Re: Question on Copper Purity
« Reply #11 on: 12 Sep 2018, 07:18 pm »
OFC copper is not free of oxygen, it's more like reduced oxygen content and refers to the smelting process used.  6N or 4N or rough pitch copper all refer to the amount of impurities within the copper.  Single crystal or OCC copper refer to the number of grain boundaries within annealed copper wire.  Material is a component of how a cable sounds, but it's usually swamped by geometry, dielectric, and connectors.

Yes, dielectric in particular has a strong impact.  4N (or better) OCC with teflon tubing is a nice combo.

#### Escott1377

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##### Re: Question on Copper Purity
« Reply #12 on: 13 Sep 2018, 05:36 pm »

#### FullRangeMan

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##### Re: Question on Copper Purity
« Reply #13 on: 13 Sep 2018, 11:14 pm »
This is my copper of choice, multiple gauges available

http://www.soniccraft.com/product_info.php/neotech-solid-upocc-copper-in-teflon-24-awg-red-p-1593
AWG 24 is suited for phono or signal cables for tube amp I used the awg 14 Teflon, there is a inexpensive PVC version.

#### Steve

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##### Re: Question on Copper Purity
« Reply #14 on: 17 Sep 2018, 01:11 am »
The higher the purity, less contaminants, the fewer the internal boundaries to create noise and artificacts, rough analogy is a quiet stream vs rapids created by stones in the water. Resistor manufacturers address the problem of roughness of wire surface etc by polishing some wire wounds etc.

To my knowledge, from some time ago, only a couple of manufacturers in the world make wire in a nitrogen atmosphere.

cheers and continue on.

steve
« Last Edit: 13 Dec 2018, 02:42 am by Steve »

#### FullRangeMan

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##### Re: Question on Copper Purity
« Reply #15 on: 17 Sep 2018, 04:25 am »
Hi Steve,
Ni is used in OFC?

#### Steve

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##### Re: Question on Copper Purity
« Reply #16 on: 17 Sep 2018, 11:23 am »
Hi Steve,
Ni is used in OFC?

To keep oxygen away, minimizing any oxidation of the copper during the manufacturing process. I should have been more clear in my earlier post.

cheers

steve

#### FullRangeMan

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##### Re: Question on Copper Purity
« Reply #17 on: 17 Sep 2018, 06:12 pm »
Thanks Steve, you most kind.

#### GRACE RUBY

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##### Re: Question on Copper Purity
« Reply #18 on: 19 Jan 2019, 05:37 am »
OFC copper is not free of oxygen, it's more like reduced oxygen content and refers to the smelting process used.  6N or 4N or rough pitch copper all refer to the amount of impurities within the copper.  Single crystal or OCC copper refer to the number of grain boundaries within annealed copper wire.  Material is a component of how a cable sounds, but it's usually swamped by geometry, dielectric, and connectors.

Thanks for above.
If what i understand this to be is true, all that is done is the wire is "pulled in a nitrogen filled oxygen free atmosphere" there should be a rating agency of some sort to  "Verify Purity" with a stamp mark
Jesus, who really knows what amount of god knows what was in the air when the wire is pulled
what if some one burped into the chamber before closing door after eating pork.
I'm Just saying

GR

#### WGH

##### Re: Question on Copper Purity
« Reply #19 on: 19 Jan 2019, 04:01 pm »

what if some one burped into the chamber before closing door after eating pork.

Then you have pulled pork.