Jason, Are you wave soldering in a nitrogen blanket? Sometimes this may help improve top side coverage. What type of wave are you employing? Dual, turbulent, etc. Also, how is the flux applied? Foam, spray, other? My experience has shown that foam fluxing is better than spray because the flux wets the holes better. Also, have you monitored the thickness of the OSP on the copper? Follow the instructions to determine OSP film thickness to see if it is in spec. A very thick OSP film will make it difficult for the flux to cut through, thus impeding solder flow up. Good luck -----Original Message----- From: Jason Smith [SMTP:[log in to unmask]] Sent: Thursday, December 16, 1999 6:50 AM To: [log in to unmask] Subject: Re: [TN] OSP and wave soldering I am having problems with wave soldering OSP boards. After the boards have seen a heat cycle (reflow), they are impossible to get hole fill on topside without first cleaning the boards to remove either oxidation or hardened OSP. I don't know which one I have because I haven't had them analyzed yet. The flux used to wave solder the boards is a very weak customer dictated rosin no clean flux. The OSP is Cu106A. I am not familiar with OSPs. They won't do HASL either. Any insight? Suggestions? Assistance? As it stands now, the process is to flux with high solids water soluble/heat to clean the board-->wash off flux-->immediately wave solder with rosin containing no clean. This is not a production process........ Jason Smith Process Materials Engineer Lexmark Electronics ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################