Since there is no internationally accepted specification for any copper alloys called "red copper", I simply wanted to know the purity and alloying elements so I could better understand just what "red copper" is from a scientific/materials standpoint and how it compares to international standards such as ofe 101, 102, 110, etc....
I didn't ask the whole process of manufacture. I asked a simple question that should have been quite easy to answer.
I didn't ask the whole process of manufacture. I asked a simple question that should have been quite easy to answer.
Hi All,
My guess is that the "red copper" is Red Brass as opposed to yellow brass. Red Brass tends to be a red color because of a high copper content.
Pure copper would not have the strength to hold the shape of the items shown or the hardness to be be machined.
DT
My guess is that the "red copper" is Red Brass as opposed to yellow brass. Red Brass tends to be a red color because of a high copper content.
Pure copper would not have the strength to hold the shape of the items shown or the hardness to be be machined.
DT
On second thoughts... forget it. If the photos I posted aren't enough, then nothing will be.
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You do not think that there is just a little tin in there for machinability?
999.99% Cu?
Allow me to jump in here. i was in Shenzhen two weeks ago and went to this area where a lot of electronics parts are sourced and sold. i bought a rhodium plated contact power cord, oxygen free RCA cables and speaker binding posts made from the same "red copper". The guy could not explain the term either, even in Chinese. You see, if I remember right, there is not a different Chinese character for copper and brass, rather by color. This could be explained by the red brass term mentioned in other posts. Also, these guys deal in large quantities and probably would not devote so much time to individual questions. i do not know how much the parts are priced at for the OP, but I decided to buy 8 pairs of those binding posts as the cost was not so high. Figured I will chance it.
Is copper too soft to be machined ? Perhaps I should add some tin to my butter... ;-)
The quality is indeed very good and sound good as well. I got it directly from Taobao. Since they are not too expensive, why not buy a pair to try it out first? BTW, this is the other company in China making these
http://www.coppercolour.cn/
http://www.coppercolour.cn/
This would make it technically a high copper bronze, like US Lincoln pennies prior to 1982. I'm not sure of the machinability of that mixture, it may be difficult. Coins are punched out and then die pressed.
The addition of small amounts of zinc might make it more workable. Of course then it would be a high copper brass.😉 It might help to resist corrosion though. Gilding brass is used for displays and signage because it corrodes less easily, but Gilding brass is typically classified as 90Cu/10Zn to 80Cu/20Zn. Gilding brass is not so hard to work with, see photo. Those little pieces were cut from the big piece using a saw. The whole chunk weighed about 5Kg. It does conduct quite well and happens to makes great heatsinking material.😀
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If a high copper brass that is corrosion resistant and workable is wanted, I suppose this is a good source. Hmmm, I just had a thought, the .38 Special casings look to be about the size of an RCA connector. I wonder if a spent cartridge could be cleaned and cut, and used as such.
The CU/Zn ratio varies from one manufacturer to the other, but can be as high as 85/10 and is in the range of a Gilding brass.
The CU/Zn ratio varies from one manufacturer to the other, but can be as high as 85/10 and is in the range of a Gilding brass.Attachments
I don't know how is it in Chinese, but in my language we call pure copper "vörösréz" (red copper), and brass "sárgaréz" (yellow copper). Probably the Chinese supplier meant pure (OFC) copper...
It´s probably just a certain copper quality the Guangzhou Copper Factory Co., Ltd
sells, an labeld it "red copper" because of the colour:
Red Copper|Guangzhou Copper Factory Co., Ltd
sells, an labeld it "red copper" because of the colour:
Red Copper|Guangzhou Copper Factory Co., Ltd
This is not just about making color pigments. Perhaps the link isn't the best one but gives the idea to start. It's about Cuprite, or red copper ore, Cu2O, is an oxide ore. The process of extracting copper from copper ore varies according to the type of ore and the desired purity of the final product. Each process consists of several steps in which unwanted materials are physically or chemically removed, and the concentration of copper is progressively increased. Some of these steps are conducted at the mine site itself, while others may be conducted at separate facilities.
I don't wonder that OP got the answer from eBay seller to surf the web and Wiki 🙄
Also, it's not "just" but it is "because of the color" of copper ore.
Thanks to OP (even that he accused good seller from eBay for no reason) we all have chance to learn what the "red" copper actually is, and how is produced. There are "tons" of articles on the web for those who want to search, and learn.
http://www.galleries.com/Cuprite
I really don't expect from any Bay seller (or even manufacture) to explain the process of making certain type of copper or final product to the buyer of pair of sockets.
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I have already explained this twice so I can only assume you either have great difficulty comprehending written English or you are consciously ignoring reality.
Again, I did not ask anything about the process of making red copper. I asked what the purity is and what internationally recognized alloy it is related to. I asked if it was ofc. All simple questions to answer, and questions any competent seller should be able to answer.
And yes, the seller was rude to the point that I would never buy anything from them, never mind the fact that they either don't know what they are selling or prefer to hide the details for what could only be a less than desirable reason. There are too many helpful, knowledgeable, and decent vendors to want to waste any time with the likes of A&B Systems.
I rather believe in seller, as I'm their satisfied customer than someone anonymously on forum accusing people without the proof, and your comment offends me. My English is quite good and much better than your understanding of the point.
In the other thread you did accuse another respectable seller from China that is selling fake wire, without any proof of that, and I was very polite to you in my answers. Mods can check all this out, if they want.
My last post was about putting more light into the matter of red copper, as this made a lot of confusion at the end.
I'm done here.
None of these disagreements would have emerged, if the seller had simply answered the buyer's questions.
That probably prompted the discussion. We are thinking: "why did the seller want to keep the information to themselves?"
That probably prompted the discussion. We are thinking: "why did the seller want to keep the information to themselves?"
Up till 15-20 years ago, water pipes at a DIY centre could be had as red copper pipe & fittings, or yellow copper.
No one in his right mind would ask an employee there what the difference was.
(the corresponding term in those days was fckng pncl lckr)
Imo, someone who contacts a seller in China should do his homework before he makes the calls.
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