Roger The good news is you don't have to remember anymore. With the right soldermask, you can do it before or after. We use a mask from Enthone that is formulated to provide chemical resistance to the ENIG chemistries. Here's a link to some more information on the issue. http://www.enthone.com/electronics/pdf/IMUP10.pdf > ---------- > From: Roger M. Stoops[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum. > Sent: Tuesday, October 23, 2001 8:52 AM > To: [log in to unmask] > Subject: [TN] Question regarding ENIG and solder mask > > For some reason I can't recollect (due to advancing age, dead brain cells, > etc.) whether ENIG plating is done before solder mask or after . I > remember something about the chemical baths attacking the solder mask, so > all electroless nickel and immersion gold plating would have to be done > first. Could someone check my memory for me please? > > Roger M. Stoops, C.I.D., PCB Designer > [log in to unmask] > > > Trimble > Engineering and Construction Division > 5475 Kellenburger Rd. > Dayton, OH 45424-1099 USA > Ph: +01 937.233.8921 or +01 937.233.4574 ext 288 > Fax: +01 937.233.7511 > > -------------------------------------------------------------------------- > ------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt delivery of Technet send the following message: SET > Technet NOMAIL > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > -------------------------------------------------------------------------- > ------- > --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------