Have you checked the plating rate , it sounds as if the electroless copper
bath is over active causing nodular copper growth
I am assuming you are using high build, which Macdermid electroless is it ?
(I am ex Macdermid Technical Sales in UK)

----- Original Message -----
From: Francis Lai <[log in to unmask]>
To: <[log in to unmask]>
Sent: 05 June 1999 01:56
Subject: [TN] PTH Problem


> We use the Macdermid PTH line. Recently, after PTH there are fluffy,
> small minute copper deposits around the drilled holes besides the
> electroless copper on the PTH walls. The copper surface of the panel
> looked porous. After copper plating, they became pits on the surface of
> the panel and nodules on the PTH walls.
> Can any one help?
> My e-mail : [log in to unmask]
> THANKS!!!!!!!
>
> Francis
>
> ################################################################
> TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services"
section for additional information.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or
847-509-9700 ext.312
> ################################################################
>

################################################################
TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################