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March 2009

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 18 Mar 2009 15:30:09 -0500
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text/plain (278 lines)
LOL. Good choice of words, Werner. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Wednesday, March 18, 2009 3:05 PM
To: [log in to unmask]
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?


 Hi Leland,
You are making a crass assumption-pre-production design validation.

Werner


 


 

-----Original Message-----
From: Leland Woodall <[log in to unmask]>
To: TechNet E-Mail Forum <[log in to unmask]>; [log in to unmask]
Sent: Wed, 18 Mar 2009 3:30 pm
Subject: RE: [TN] Using CEM-1 in Pb-free Wave Solder?










I'm wondering why this wasn't discovered during their initial
pre-production design validation (HALT, HASS, etc.)?

Leland

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Wednesday, March 18, 2009 3:24 PM
To: [log in to unmask]
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?


 With GM it was the moisture swelling during use under the hood that
caused the problem.

werner


 


 

-----Original Message-----
From: Honsowetz, Eric <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, 18 Mar 2009 3:17 pm
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?










Good Afternoon Werner,

Thank you!

That is what we all think also, we have concerns that moisture might be
an issue during soldering & the material might be degraded by the higher
temperatures too.

Best Regards,
 
eric
 
248-447-1038 (desk)
734-223-5599 (cell)
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Wednesday, March 18, 2009 3:08 PM
To: [log in to unmask]
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?


 Hi Eric,
IPC has quality Classes 1 through 3; CEM-1 with un supported 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]>
To: [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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