Butter coat is a term used more frequent by laminator
who manufacture laminate. The definition is clear and
"butter coat" is the result of the process, most
important is glass style and resin content. If you use
7628 and 2116, butter coat will be thin because resin
content is lower. The extreme is copper tooth kiss
glass fiber.

--- Brian Ellis <[log in to unmask]> wrote:

> OOF!
>
> Whittaker, Dewey (AZ75) wrote:
> > This is an old term and critical process with no
> margarine for error.
> > Dewey
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of
> Ryan Grant
> > Sent: Thursday, January 13, 2005 9:52 AM
> > To: [log in to unmask]
> > Subject: [TN] Butter coat
> >
> >
> > Hi Technetters,
> >
> > I just learned a new PCB fabrication term
> today..."butter coat".  It's
> > supposed to be thin layer of resin between glass
> cloth bundles and
> > conductors to assure reliability.  In the few shop
> audits I've been
> > through, I've never seen or heard of a "butter
> coat".  What would the
> > process look like?  Is the resin pressed and
> frozen into a sheet that
> > can be handled or would it be squeegy'd on?  If it
> is squeegy'd, can
> > that be performed by hand or must a machine do it?
>  If a machine must do
> > it, how do you lay up the brick for the press?
> Finally, is this a
> > standard process that I've just been unaware of?
> >
> > Thanks,
> > Ryan
> >
> >
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