Don't overlook the obvious-
It is amazing the risks that automotive will take to save a dime. I suppose they have to. As I recall, the product was not changed to a double-sided board until after the recall, obviously because it was cost prohibitive.
Chris
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Wednesday, March 18, 2009 8:34 PM
To: [log in to unmask]
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?
Hi Lee,
The 4+ million recall was forced by NHTSA-what happened was that the windshield wipers stopped working---sometimes in less than one year.
In terms of technical documentation; I use it as a case study in my 'Root Cause Analysis' workshop.
No preproduction certification that I know of; and if they did they obviously did not know what they were doing---but that, of course, is not unique to GM.
Werner
-----Original Message-----
From: Lee parker <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, 18 Mar 2009 8:21 pm
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?
Werner
Has this GM issue been documented anywhere.
Also, I am wondering why the laminate manufactures have not responded to this
inquiry.
I have worked with many customers who have had CEM-1 boards built in Asia and I
am not aware of any adverse effects although none were automotive. Generally, we
were careful to be sure that the material was compatible with the specified
environment. Was any preproduction certification performed in the case you
mentioned below?
Best regards
Lee
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: Werner Engelmaier /*<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Wednesday, March 18, 2009 3:08 PM
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?
Hi Eric,
IPC has quality Classes 1 through 3; CEM-1 with unsupported holes is Class -1.
This is the same material
/design combination that resulted in GM having to
recall over 4 million SUVs and trucks.
CEM-1 not only has a high CTE, but also is hygroscopic and swells
significantly when absorbing moisture-bad combination for Pb-free T's and
automotive application.
Werner
-----Original Message-----
From: Honsowetz, Eric <[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Wed, 18 Mar 2009 2:59 pm
Subject: [TN] Using CEM-1 in Pb-free Wave Solder?
Good Afternoon Technetters;
So having been googling through this question for a couple of days off
an on I am turning to that one definite source of knowledge, you all...
What are the ideas regarding using CEM-1 material in a Pb-free (SAC)
wave soldering process for a high reliability product (Automotive - 15
year life without failure). This would be a copper on one side board
with through-hole parts only.
BTW googling provides the best of both worlds...people saying "yes" and
others saying "no" so whatever your answer you can't be wrong. :)
Best Regards,
eric
248-447-1038 (desk)
734-223-5599 (cell)
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