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From:
"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:
Mon, 13 Sep 2010 10:21:12 -0700
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Which is worse: knowing; or not knowing?
IPC-TM-650, Method 2.6.8 - not knowing
IPC-TM-650, Method 2.6.27 - knowing
Dewey


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Monday, September 13, 2010 10:02 AM
To: [log in to unmask]
Subject: [TN] FW: IPC-TM-650, 2.6.8, BAKING OF PWB QUESTION,

Fellow TechNetters:

   Which is worse:   The initial shock of the molten solder or the Constance thermal cycling?   On thicker boards, 220 mils, when the solder did not wick the entire barrel.  Is this a valid thermal shock?

"X"

-----Original Message-----
From: Hernandez, Victor G 
Sent: Wednesday, August 18, 2010 9:22 AM
To: TechNet E-Mail Forum
Cc: Hernandez, Victor G
Subject: IPC-TM-650, 2.6.8, BAKING OF PWB QUESTION, 

Fellow TechNetters:

   IPC-TM-650   2.6.8

Can this test method be used for LF application:
Sample is 24 layers mid plane, FR4, back/front side drilling, 
0.019 & 0.020 finish hole size,

Any comments will greatly be appreciated.

Victor ( "X" )


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Tuesday, July 13, 2010 3:55 PM
To: [log in to unmask]
Subject: Re: [TN] BAKING OF PWB QUESTION

My rule of thumb has been 105°C for 4 hours max.

Consider 
- Time and temperature degrades the dielectric.
- Time and temperature degrades the surface finish.
- Lead/free applications have a greater need for baking as compared to tin/lead applications.


Paul Reid 

Program Coordinator 
PWB Interconnect Solutions Inc. 
235 Stafford Rd., West, Unit 103 
Nepean, Ontario 
Canada, K2H 9C1 
613 596 4244 ext. 229 
Skype paul_reid_pwb 
[log in to unmask] <mailto:[log in to unmask]> 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roberts, Jon (SA-1)
Sent: July 13, 2010 11:35 AM
To: [log in to unmask]
Subject: [TN] BAKING OF PWB QUESTION

Is there a rule of thumb or any best manufacturing practices of how long
after baking does the PWB have to be processed?   Jon


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