Although I'm not too familiar with the process your talking about it may be the bridging is a consequence of using no-clean flux. By definition the residue & therefore the anti oxidisation blanket some of the agents provide, in no-clean flux is less & therefore not as tolerant. This can leave you open to oxidisation when exiting the wave culminating in bridging. You may be getting a similar effect (flux burning off prematurely) by having the pins in the wave too long. without more information it's difficult to cover all aspects without writing War & Peace! Regards Iain. ______________________________ Reply Separator _________________________________ Subject: [TN] solder fountain process Author: Lik-Jen.Wu.lwu ([log in to unmask]) at Internet Date: 12/28/98 9:22 PM *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. Hi! I am using a solder fountain process to solder a PGA processor chip on a double sided board. This is a fairly new process to me and we are getting solder bridges on some of the pins on the PGA chip. The board is preheated before it hits the solder fountain. The top side temperature of the board is 150C (220F), the solder temperature is 260C (500F) and no-clean flux was used. I wonder if anyone out there has had success in using solder fountain to solder PGA. Thanks, Lik-Jen Wu Nortel Networks (Wireless) Manufacturing Engineer Tel: 403-781-4612 Fax: 403-232-4321 ESN: 760-4612 email: [log in to unmask] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################