Hi TechNet! Try conducting a thermal profile of your board with a thermocouple attached to the QFP pads and a thermocouple attached to the QFP leads - you may have uneven heating with the board internal layers thieving enough heat that the leads become the preferred direction for solder flow. The thermal profile data should help point you in the right direction. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: Reflowing gold plated board Author: [log in to unmask] at ccmgw1 Date: 4/12/97 12:54 PM I am processing a board with pads that are gold plated. I am using OA paste 63/37. All the pads are flowing good except for a QFP. Shorts are appearing after reflow. The screen apertures are the same dims that i normally use for HASL boards. The profile is set to the low side temperature wise ( i tried a higher temp and it was just as bad). It appears that the solder is not flowing evenly between the pads and the leads. It is flowing more so to the leads than the pads. I also tried applying a liquid OA flux to the leads of the QFP prior to reflow and that made the shorts even worse. Anyone have any suggestions. Thanx ahead. *************************************************************************** * 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] * ***************************************************************************