Variables (at least what I can think of off the top of my head) for pressed
thickness of pre-pregs.

1. Manufacture of pre-preg.
        - manufacturer
        - resin content
        - style (no flow, high flow, etc.)

2. Lamination press cycle.
        - Lamination pressure (each shop may vary).
        - Press type (straight hydrolic, vaccuum assist, autoclave)
        - Thermal profile (heat rise rates, etc.)

3. Venting in artwork used in imaging (effects resin "squeeze out")

4. Circuit geometry of the innerlayer, including copper weight (effects
resin "squeeze out").

Not necessarily in order of priority. And I'm sure I forgot a few. With so
many variables, abolute consistency between vendors may not be in the cards.

Bob Dube

-----Original Message-----
From: Brunker Ed <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Thursday, February 10, 2000 9:50 AM
Subject: [TN] PREPREG AGAIN


>Sorry guys,
>I'm still wrestling with this one.
>Can you give me the thickness of 1080 X 2 after pressing.
>Can we work through the reasons for two suppliers giving different results
>for the same prepreg bearing in mind that not all manufacturers are in the
>western world.
>Does the pressing process have much impact on finished thickness?
>Are there any standards with which to control prepreg production?
>Regards
>Edward Brunker
>
>##############################################################
>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
>##############################################################
>

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