That is what I recall as well; it does not get added to wrap.

C. D. (Don) Dupriest
Lockheed Martin - MFC
Advanced Manufacturing Technology
member of:
Production Technical Excellence Staff 
Ph. 972/603-7724 fax: 972/603-9052
Email: [log in to unmask]


-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Buechner, Mark R (US SSA)
Sent: Tuesday, August 17, 2010 4:39 PM
To: [log in to unmask]
Subject: EXTERNAL: Re: [IPC-600-6012] Class 3/A requirements

Wendi,
The class 3/A requirements for Plating/Coating Thickness only address the requirements for the first two rows (titled "Copper-average" and "Thin areas") of Tables 3-3, 3-4 and 3-5.  At least that is what I believe the intent of the sentence "The following apply to minimum copper average and minimum thin areas:"....which we put in the Class 3/A box in the table.

There was not a separate revised Class 3/A requirement created for the third row of each of the tables ("wrap"), so the values listed for Class 3 "wrap" in each of the three tables is applicable to Class 3/A products.

Mark Buechner
Quality Assurance Engineer
BAE SYSTEMS
Electronics, Intelligence and Support
Phone (603) 885-6503

-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Wendi Boger
Sent: Tuesday, August 17, 2010 5:07 PM
To: [log in to unmask]
Subject: [IPC-600-6012] Class 3/A requirements

I need some clarification on the requirement for Plating/Coating
Thickness.  The 3/A page requires additional copper thickness above
class 3 to be added to tables 3-3, 3-4 and 3-5.  Does this also apply to
the minimum wrap thickness?  (Example) Is it required for a
non-conductive filled through via to have .944 mils of wrap (table 3-3)?
It's a bit confusing as it says to apply to minimum copper average and
minimum thin areas.



Wendi







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