PEG type products are often used in older types of HASL and reflow fluxes PEG type products are infamous for their poor rinsability [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Bill Davis Sent: 20 August 1999 21:14 To: [log in to unmask] Subject: [TN] PEG? I am experiencing a contaminant on the gold contact fingers on our boards after assembly. We have identified it as polyethylene glycol laureate, a surfactant. We do not use use tape or boots on our fingers and our process is a no clean process. Our incoming inspection doesn't see it there when the bare fabs arrive, but we see it there after assembly. We are more than a lttle mystified as to the source of this. We do use OSP on the boards (Entek 160), but this doesn't appear to be the source either. I curious if such sufactants would be used during the manufacturing processes of the bare fabs and could be leaching out during reflow? Bill Davis, Ph.D. Senior Scientist [log in to unmask] ############################################################## 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 ##############################################################