Jim,
I guess most fabricators would say don't specify prepreg types - unless you
have a real reason for doing so. It's best to specify dielectric spacings
only, even for a controlled impedance board.
Prepregs vary from manufacturer to another, also the finished thickness is
dependant on a number of factors in board fabrication such as bonding
pressure, vacuum and heat up rate.
You can find info on glass styles at www.ppg.com and www.bgf.com
Most of the laminators give pre-preg details on their web sites.
I Have some general info on prepreg if you are interested.
regards
Geoff Layhe
www.lamar-uk.co.uk


-----Original Message-----
From: Marsico, James [mailto:[log in to unmask]]
Sent: 23 April 2002 21:06
To: [log in to unmask]
Subject: [TN] PREPREG


Hello, Technetters:

I'm very naive when it comes to prepreg, so I'll go to the experts.  Is
there a list available of prepreg designations (i.e. 2313, 1080, 106, etc.)
with the respective properties?  Will a stack-up of the three prepregs
mentioned yield a thickness of .006 inches?  Where can I find information on
hot to specify prepreg layers in a PWB?

Thanks in advance,

Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>
631-595-5879

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