Hi Ed, 1. How much time between first and second reflow? Is there enough for the board to absorb moisture which causes the outgas? 2. Could the outgas be from trapped flux? A longer TAL during first reflow may help if this is the case. 3. Can you lower the bottom side temperature during the second reflow? Since you have big heavy components on the top side probably not. Good luck, Jerry Dengler Production Manager Pergamon Corporation 380 Crooked Lane, Unit# 3 King of Prussia, PA 19406-2567 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ed Popielarski Sent: Friday, May 08, 2015 1:08 PM To: [log in to unmask] Subject: [TN] Dpak outgassing second pass Greetings fellow Technoids, An interesting debacle arose, and I'm unsure if there is a solution. Dpak components on side 1 solder fine, <25% voids, 100% edge wetting. On 2nd pass (top side, big heavy components) the Dpaks on side 1 outgas and exceed 25% (not a spec, just a target) but violate edge wetting (S/B 100%) as the outgas tends to blow out the edge somewhere. Any suggestion on how to eliminate this phenomena? Parts cannot be relocated due to aerospace re-qual cost. Thanks in advance! Ed Popielarski Engineering Manager [cid:[log in to unmask]] 970 NE 21st Ct. Oak Harbor, Wa. 98277 Ph: 360-675-1322 Fx: 206-624-0695 Cl: 949-581-6601 "It's one kind of victory to slay a beast, move a mountain, and cross a chasm, but it's another kind altogether to realize that the beast, the mountain, and the chasm were of your own design." https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________