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Wed, 25 Aug 2010 11:05:33 -0700 |
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Paul - I understand your position but the spec states plating and total
Cu is total Cu. We are not supposed to read into it more than it says.
Jim
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Wednesday, August 25, 2010 12:40 PM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] wrap and electroless
I have to agree with Roberto, electroless should not count in the
thickness measurement of wrap. There are times when there are double
electroless copper layers. Some times we see double electroless copper
with exotic PWB constructions. I think one of the larger electroless
copper suppliers suggests double processing on a high build electroless.
That means electroless could be up to 50% of the minimum thickness
requirement.
It is my subjective opinion that the electroless copper does not
directly add to the robustness of the wrap (unless of course it is
missing). Two mils of electrolytic copper has been demonstrated to be
robust in reliability testing. Less then .002" is usually a reliability
liability.
Best regards,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario
Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask] <mailto:[log in to unmask]>
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