Subject: Re[5]: Soldermask peeling
Author:  Jim Wilson at Jabil_StPete2
Date:    12/10/96 2:22 PM


    I have had this problem in the past when post etch/strip cleaning is not 
    controlled or has been contaminated at the pcb manufacturer. It's hard 
    for me to believe that three suppliers would have this problem at the 
    same time. I would take a hard look at the wave soldering process (flux 
    application, preheat and solder pot temperatures).
    
    Jim Wilson
    Jabil Circuits Inc.
    [log in to unmask]
    
    
    
______________________________ Reply Separator _________________________________
Subject: Re[4]: Soldermask peeling
Author:  [log in to unmask] at Jabil_Internet 
Date:    12/10/96 11:47 AM
    
    
     We don't clean our boards after assembly. We use an Alpha no 
     clean flux, SM351. The peel is noticed immediately after 
     wave. It doesn't affect all boards. In a controlled test 3 
     out of 12 peeled. 
     This is a SMOBC, LPI soldermask. Raw boards are stored at 70 
     Degree F at 10-15% humidity. We don't bake prior to assembly. 
     Of the Suppliers boards that failed, two of the three were 
     received and processed within one week.
    
    
______________________________ Reply Separator _________________________________
Subject: Re: Re[2]: Soldermask peeling
Author:  [log in to unmask] at Internet 
Date:    12/10/96 8:40 AM
    
    
The one thing that concerns me is your comment
that you (an assembler) are experiencing the problem 
with more than one board fabricator.  To me that 
indicates that the cause is the assembly process rather 
than having all fabricators exhibiting the same problem 
at the same time.
    
Does the mask peel immediately after assembly or 
is it noted after cleaning
    
Susan Mansilla
Robisan Labs
317-353-6249
    
*************************************************************************** 
* TechNet mail list is provided as a service by IPC using SmartList v3.05 * 
*************************************************************************** 
* To unsubscribe from this list at any time, send a message to:           * 
* [log in to unmask] with <subject: unsubscribe> and no text.        * 
*************************************************************************** 
* If you are having a problem with the IPC TechNet forum please contact   * 
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      * 
***************************************************************************
    
    
*************************************************************************** 
* TechNet mail list is provided as a service by IPC using SmartList v3.05 * 
*************************************************************************** 
* To unsubscribe from this list at any time, send a message to:           * 
* [log in to unmask] with <subject: unsubscribe> and no text.        * 
*************************************************************************** 
* If you are having a problem with the IPC TechNet forum please contact   * 
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      * 
***************************************************************************
    

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************