The Difference between ED Copper and RA Copper

Go To Last Post
3 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

<Flexibility in the copper comes from multiple factors. Of course the thinner the copper, the more flexible.  In addition to the thickness (or thinness), copper grain also affects flexibility.

There are two common types of copper that are used in the PCB and flex circuit markets. Electro Deposited (ED) and Rolled Annealed (RA).

Differences between  Electrolysis Deposition Copper Foil and Roll Anneal Copper Foil

1. Electrolysis Deposition Copper Foil (ED copper):

Formation: Melt copper into dilute sulfuric acid, it becomes bluestone solution.
Through a high electric field, copper attach on the metal drum. With the rolling of metal drum, thin copper foil finally formed.

Advantage: Low cost, ED copper has better conductivity than RA copper.
Shortage: Unsuitable for small lines; bad bending resistance.

2. Roll Anneal Copper Foil (RA copper):

Formation: Roll copper block many times, and then do the annealing treatment with high temperature. The shape of its crystal is lamellar structure.

Advantage: Soft, smooth surface, suitable for flexible PCB and small lines.
Shortage: high cost >

Last Edited: Fri. Nov 8, 2019 - 12:42 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 2

Be warned that any sales/marketing posts must go into the Marketplace forum. The above is not immediately trying to advertise/sell anything but I suspect from your previous posts such as:

 

https://www.avrfreaks.net/commen...

 

that it is headed that way. 

 

We don't mind PCB companies trying to sell their services here (many readers are interested) but, like I say, it should stick to the Marketplace forum.

 

Moderator.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

I have cleaned up other posts from caringpcb anymore posts get them banned.

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly