"NOTE: The information in this e-mail is confidential and may be legally privileged. If you are not the intended recipient please notify the sender immediately and then delete  this  e-mail. You must not read, copy, use or disseminate this e-mail or any  information in it .  Although this e-mail and any attachments are believed to be free of any virus or other defects which might affect any computer or IT system into which they are received, no responsibility is accepted by Laporte plc or any of its associated companies for any loss or damage arising in any way from the receipt or use thereof. Any opinions expressed in this e-mail or any attachments are those of the individual sender and not necessarily the Company."
"

Steve,

It is possible the mask was put on a little thick (excessive wet film
thickness). The operator may have used a mesh that allowed too much ink to
go  down. May ask them whose ink, method of application (screen, spray,
etc.) Another possibility is entrapped solvents, especially around high
circuit traces. Check the pre-dry prior to  exposure

Good luck,

Mike Carano

        -----Original Message-----
        From:   Stephen R. Gregory [SMTP:[log in to unmask]]
        Sent:   Wednesday, July 26, 2000 2:11 PM
        To:     [log in to unmask]
        Subject:        [TN] "Bubbly Soldermask..."

        Hi all!

        We just got some boards in at receiving inspection that have
thousands of
        little "bubbles" in the soldermask all over the boards...they seem
to
        concentrate all along the edges of the features of the board. You
can see
        pictures of it at:

        http://www.driveway.com/share?sid=e25a88c4.8e904&name=Pictures

        One picture is bubblemask.jpg, the other is bubblemask2.jpg...what
would
        cause that? It's a LPI...don't know the brand name. I'm thinking
that either
        the boards weren't dry or cleaned well prior to soldermasking them.
I'm
        rejecting the boards of course...

        My freedrive is filling up fast with all the pictures of the "pretty
boards"
        that we get from our vendors!!!

        -Steve Gregory-

        ##############################################################
        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 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 1.8c
##############################################################
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 Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################