Hi Elizabeth - You might try investigating the compatibility of the soldermask and the flux chemistry. I have found that the soldermask texture (i.e. either shiny/smooth or matte/rough) and the specific flux interaction is very important. The general industry trend is that shiny soldermask will have more solderballs/bridging than matte soldermasks but I have found that with certain flux chemistries I can use shiny soldermasks with no solderball/bridging problems. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: Solder bridging after wave solder Author: [log in to unmask] at ccmgw1 Date: 4/23/97 7:19 PM Dear Technet, I have a customer who is reporting bridging on the solder side of the board after wave soldering. I have seen the boards, and they look quite messy, with solder sticking to the mask as well as between component leads and pads. The mask itself is adhering nicely. The mask is PC501 from Haven, with C101 hardener. This was recently discontinued by MacDermid and picked up by Haven. The flux is no clean, ENFLUX NCF-8660, and is under pressure with nitrogen. The wave itself is at 500 degrees F, with preheats set to get the board to 210 to 220 degrees F when it hits the wave. The same design board with LPI ran fine, so I do not suspect a problem in another area of the process. No other customers are reporting this problem, and I am at a loss as to where to investigate further. The customer is not happy, and wants a resolution today! If anyone has any insights, please let me know. Thanks, Elizabeth Falk Process Engineer, Beaverbrook Circuits *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * 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 subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * 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] * ***************************************************************************