Hi, Roger,

ENIG plating can be done either before or after solder masking. If before,
you just get more ENIG plating on the board as no areas will be masked.
This might cost a little more because of the extra chemicals consumed, but
saves the risk of the mask being attacked by the gold plating bath.

If after, the you save on the Nickel/Gold plating but have to have a solder
mask that is capable of withstanding the plating processes, particularly
the Gold one.

Peter Duncan



                    "Roger M. Stoops"
                    <rstoops@SPECTRAPRECISI        To:     [log in to unmask]
                    ONDAY.COM>                     cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST
                    Sent by: TechNet               Aero/ST Group)
                    <[log in to unmask]>              Subject:     [TN] Question regarding ENIG and
                                                   solder mask

                    10/23/01 11:52 PM
                    Please respond to
                    "TechNet E-Mail Forum."






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
---------------------------------------------------------------------------------





[This e-mail is confidential and may also be privileged. If you are not the
intended recipient, please delete it and notify us immediately; you should
not copy or use it for any purpose, nor disclose its contents to any other
person. Thank you.]

---------------------------------------------------------------------------------
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
---------------------------------------------------------------------------------