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View Full Version : How thick is the copper on printed circuit board



John Stevenson
04-07-2010, 04:59 PM
Got this from the local Maplins, like Radio Shack, but the spec just says small medium and large as in size, no thickness or weight given so take this as the basic bog standard type of board.

CountZero
04-07-2010, 05:06 PM
Probably around 35 uM

John Stevenson
04-07-2010, 05:08 PM
What's that in English ?

fasto
04-07-2010, 05:09 PM
1 oz. copper (standard stuff) about 0.0007 thick (7 tenths).

bob_s
04-07-2010, 05:10 PM
FR1 94V0 board has maximum copper thickness 0.21 mm

AlleyCat
04-07-2010, 05:51 PM
A one ounce copper weight would be .00134" thick.

Your Old Dog
04-07-2010, 05:55 PM
The definitive answer can be found here.

http://en.wikipedia.org/wiki/Printed_circuit_board

or here.

http://en.wikipedia.org/wiki/Heavy_copper#Heavy_Copper_PCB

And of course, not knowing what you want to do with this copper foil:

http://en.wikipedia.org/wiki/Shoplifting which says in part:


Copper finger
A shoplifter may tape some copper foil to his finger and walk out of the establishment with the finger pressed over the RFID tag on an item in his hand. This will disrupt the signal so no alarm sounds when he leaves the building. If caught, the shoplifter might attempt to get rid of the copper foil knowing that he may be prosecuted for being "equipped to steal."
Many shoplifters combine this with the walk out technique.

that pretty much covers it :D

Just filling in for Tiffie who I think is on holiday as he hasn't weighed in yet...

Weston Bye
04-07-2010, 06:10 PM
I'll add my confusion to the mix: Empirical measurement just now of some 1 oz. printed circuit boards I made in the past showed a .0015" differential (the thickness of the copper traces) between the etched and unetched areas. Measured with my Mitutoyo calipers.

John Stevenson
04-07-2010, 06:20 PM
So on this cheap board If I go 3 thou deep I'm going to clear the copper.

Got a reason to ask and I'll share it later.

tumutbound
04-07-2010, 06:44 PM
PCB Copper Thickness
The copper in a PCB is rated in ounces, and represents the thickness of 1 ounce of copper rolled out to an area of 1 square foot. For example a PCB that uses 1 oz. copper has a thickness of 1.4mils.


1/2 oz. 0.7 mils
1 oz. 1.4 mils
2 oz. 2.8 mils

Your Old Dog
04-07-2010, 07:14 PM
So on this cheap board If I go 3 thou deep I'm going to clear the copper.

Got a reason to ask and I'll share it later.

What the hell is a few thou amoungst friends?

darryl
04-07-2010, 10:27 PM
The typical copper cladding is either one ounce or two ounce- I haven't had anything thicker come along, but thinner- possibly.

Paul Alciatore
04-07-2010, 10:51 PM
One ounce copper clad means one ounce per square foot. That is about 0.0014" thick. Here's a data sheet for one ounce copper clad board. This is by far the most common thickness. Two ounce board if a lot harder to find.

http://www.farnell.com/datasheets/52206.pdf

Of course, if it is tin or solder plated, it will be somewhat thicker.

Circlip
04-08-2010, 03:35 AM
You made sure it's REAL Copper John????? :eek:

John Stevenson
04-08-2010, 04:05 AM
What the hell is a few thou amoungst friends?

Microns ?? :rolleyes:

dr pepper
04-08-2010, 06:39 AM
You can measure it, you need to mod a bulldog clip to fit right the way accross the board both ends, and a milliohm meter, or power supply and multimeter, measure the resistance over a known length and you can then ork out the thickness from the copper spec.

sansbury
04-08-2010, 08:26 PM
The typical copper cladding is either one ounce or two ounce- I haven't had anything thicker come along, but thinner- possibly.

1/2 oz is a standard size and I have a couple of feet of 4oz double-sided I picked up cheap at a flea market. Originally got it for building some audio amps, mostly for bragging rights, but have never used it.

J Tiers
04-08-2010, 08:52 PM
If anyone still wants the actual answer, "tumutbound" gave the correct numbers.

One ounce is the most common, but 2 ounce is readily available for OEM usage.... Whether you can buy small quantities or not I don't know. Probably so if you find the right source.

As for the stuff JS has, my suggestion would be to peel a corner and see. Yuh got a mic, right?