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March 2002

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Subject:
From:
"Marsico, James" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 18 Mar 2002 08:41:19 -0500
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Is there any documentation available which lists all prepregs and their
properties?  I have a hard time understanding what 2113, 2116, 2125, etc,
are.  This info will also help me spec out our new board designs.

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


        -----Original Message-----
        From:   Geoff Layhe [SMTP:[log in to unmask]]
        Sent:   Friday, March 15, 2002 9:14 AM
        To:     [log in to unmask]
        Subject:        Re: [TN] Prepreg

        Agree with everything you say ....except there are now high resin
content
        (48%)7628 pre-pregs which means that you can use it facing copper
layers.
        2116 is definitely the best pre-preg, the glass weave is nice and
even and
        the resin content is about 55%. It's better for inner layer
registration
        than 2125.

        Geoff Layhe
        www.lamar-uk.co.uk

        -----Original Message-----
        From: Earl Moon [mailto:[log in to unmask]]
        Sent: 15 March 2002 10:40
        To: [log in to unmask]
        Subject: Re: [TN] Prepreg


        Again, but I love this stuff, you don't need two ply constructions
except
        when you need them. You get very well balanced structures, from a
resin to
        glass ratio point of view, with single ply preg and core material
except
        when using 7628 types/styles. You never use this facing copper as it
only
        has about 43% resin content and you may very well find starvation
using it.

        I feel like I've written this before. Anyway, 2113 and 2116 glass
styles
        offer the best of both laminate integrity (plenty of resin) and
dimensional
        stability (plenty of glass). No problem using two plies of these
types in
        whatever requirement. Two plies of 106 or 1080 isn't appropriate, if
        avoidable, because it's two resin rich and makes everything slip and
slide
        in the press and that's a mess.

        As for the shorting issues, that's been resolved even by the
        military/aerospace folks for years. How many, I can't even remember.
If
        you've seen this condition, as voiding and shorting etc., get a
photo for us
        all to see. If proof exists, it has to be a billion to one shot and
        certainly would point to possible process control problems of an
other than
        preg issue.


        MoonMan


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