TECHNET Archives

November 2001

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:
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 8 Nov 2001 13:04:09 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (65 lines)
 we try to spec. the >170C tg material rather than the 130 tg we see better z
axis during enviromental stress testing when the hole size is <13mils and on b/b
vias. we have less barrel cracking.




Graham Collins <[log in to unmask]> on 11/08/2001 12:37:43 PM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>

To:   [log in to unmask]
cc:    (bcc: Warren Crow/US/I-O INC)

Subject:  [TN] High Tg FR-4



Hello Technet
A question for bare board gurus.   Is there a difference in reliability between
high Tg and regular Tg FR-4 ( IPC-4101/24 vs IPC-4101/21) in a vehicle type
application?
The end use application is less than Tg of /21 material, so not in the glass
transition range for either material.

Typically - is the CTE different between these two?  (I expect that depends on
the manufacturer to some degree).  If there isn't a high temperature operating
requirement, why select the high temp FR-4?

Thanks!



regards

Graham Collins
Process Engineer,
Northrop Grumman
Atlantic Facility of Litton Systems Canada
(902) 873-2000 ext 6215

---------------------------------------------------------------------------------

Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send the following message: SET Technet
NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases >
E-mail 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
---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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
---------------------------------------------------------------------------------

ATOM RSS1 RSS2