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Thu, 19 Mar 2009 13:57:05 -0400
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TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
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Werner Engelmaier /* <[log in to unmask]>
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 Indeed it is.
Some time back I gave a workshop where I had people from an auto parts supplier. They made the same electronics for a Detroit out fit and Toyota and were required the same acceptance test. The big difference was 600 cycles for Detroit, 4,000 cycles for Toyota.

Werner


 


 

-----Original Message-----
From: Lee parker <[log in to unmask]>
To: TechNet E-Mail Forum <[log in to unmask]>; [log in to unmask]
Sent: Thu, 19 Mar 2009 8:26 am
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?


















I suppose this is one of the reasons that many years ago I began buying 
Japanese automobiles and never looked back!


 


Best regards
Lee
JLP Consultants LLC
804 779 
3389  



  
----- Original Message ----- 

  
From: Werner Engelmaier /* 

  
To: [log in to unmask] 

  
Sent: Wednesday, March 18, 2009 8:33 
  PM

  
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=2
0<[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


   
  


   0A
  -----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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