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Subject:	Re: IPC-SM-840C
From:	Douglas Pauls <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:	Thu, 27 Aug 2009 14:44:56 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (62 lines)

Vic,
IPC-SM-840, like many IPC material specifications, is a procurement 
document.  It specifies the minimum material requirements for a solder 
mask.  Undercut and over exposure are more use characteristics and the 
more appropriate specification would be IPC-6012 or its ilk. 

Doug Pauls



Victor Hernandez <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
08/27/2009 02:21 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
[log in to unmask]


To
[log in to unmask]
cc

Subject
[TN] IPC-SM-840C






Fellow TechNetters:

   I was not able to finding reference to severe solder mask
undercut/over exposure and what is acceptable.

Vic,

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