The specific gravity (density) of copper is 8.2 gram per cubic centimeter, which equates to 4.73 ounces per cubic inch (I can post the detailed calculations if anyone would like). Thus, 1 ounce of copper would be 0.21142 cubic inches in volume. 

1 ounce copper is defined as 1 square foot of copper sheet that weighs one ounce. A square inch of this sheet would weigh 0.006944 ounces. 

Thus 1 ounce copper sheet would be 0.21142 in3/oz * 0.006944 oz/in2 = 0.001468 in or 1,468 uin. 

Of course, the copper used is probably not the pure Cu which has a density of 8.2 g/cm3, so that actual thickness may be off somewhat from this calculation. 

Blair Hogg
QA Manager, GAI-Tronics Corp. 

>>> [log in to unmask] 05/30/03 12:12PM >>>
Hi All,

I got my boards back from our fab vendor (the ones that had the trace 
thickness problem), and they sent the XRF measurements that they took. But they're in 
microinches, is there some conversion that you do to convert that to copper weight?

Here's the measurements that I got:

       µin Cu      
1.    170.9
2.    173.0
3.    170.1
4.    170.6

Thanks in advance!

-Steve Gregory-    

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------



**********************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.

This footnote also confirms that this email message has been swept
for the presence of computer viruses.

www.hubbell.com - Hubbell Incorporated
**********************************************************************

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------