TECHNET Archives

November 1997

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Phillip E. Hinton" <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Sun, 9 Nov 1997 21:02:12 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (29 lines)
Hillel,

Referring to IPC-6012, Par. 3.6.2.3.   "Multiple voids between two adjacent
plated though holes in the same plane shall not have voids that same plane
shall not have combined length which exceeds those limits."  For class 2 and
3, this is 0.003 inch. See also Par. 3.6.2.4 that states the same for cracks.


I am not sure that you can designate it resin-starved when you view
resin-starvation in a vertical microsection.  The microsection may show up as
multiple tiny voids, a kind of foam, a cracking or nothing at all.  Most
often this type of feature is seen in visual exanination, and IPC-A-600 has
some good pictures of this.  IPC-6012 says to go to IPC-A-600 for some of
those defect visually seen in the board, such as crazing, measling etc.

Phil Hinton

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
##############################################################


ATOM RSS1 RSS2