Paul

in circuitry manufacturing - volcano holes usually occur when the hole walls
are underplated. can get to be sooo bad that when u wave solder a board -
it'll suck the component thru.

if u r sure they are definite shaped volcano holes - what is happening is
that the hole wall cannot take anymore thermal shock - and so it blows. just
for the heck of it - have someone take a copper thickness reading on the thru
holes - if u get less than 0.80 mils - u have a very good chance of anything
underplated volcanoing on u.

Regards

Richard
FCT

##############################################################
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
##############################################################