My only comment concerns a higher Tg material.
I have found that anything over .062 should be on
high Tg material.  Found that the holes do not stand
up well and with a high aspect ratio there may be
thin wall holes in some areas.  It should not cost
more than 5% for material ONLY for this material.
(I quote boards and this is a fact with my company)
However 170 degree is plenty.......

################################################################
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 web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################