All soldermasks lose adhesion after a wave profile. If you have a 20% 
     loss, check all processes for loss of temperature control. It could 
     also be a supplier issue with dirty panels prior to mask application.


______________________________ Reply Separator _________________________________
Subject: Soldermask peeling
Author:  [log in to unmask] at internet
Date:    12/9/96 8:36 AM


     We recently experienced soldermask peeling after wave from 
     three different Fabricators all within 2 weeks. Subsequently 
     we took sample lots of each Fabricator and performed a 
     pre-wave and post-wave tape test. In all lots the boards 
     passed pre-wave tape test but had a 10-25% failure post wave. 
     What can cause this phenomena? Does the weather change have 
     anything to do with soldermask application and durability?
     
     Dan Hickey
     Senior Buyer
     Vicor
     [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]      *
***************************************************************************