Sorry, I thought that was what SRBP was. A little more research and I found
this
http://www.felsweb.com/lam_faq.htm#Ewhich seems to explain things pretty well.
Sorry for the misinformation
On Wed, Apr 22, 2009 at 8:46 PM, leon Heller <leon355@...> wrote:
>
>
> ----- Original Message -----
> From: "Mike Oyama" <mikesb0x0fm4il2@...<mikesb0x0fm4il2%40gmail.com>
> >
> To: <Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>>
> Sent: Thursday, April 23, 2009 2:59 AM
> Subject: Re: [Homebrew_PCBs] Re: recommended thickness for boards
>
> >
> > Oh, and by the way, the terms FR-4 and CEM refer to the substrate that
> the
> > boards are made of, and not how many sides are clad with copper. FR-4 is
> a
> > UL flame retardant specification, and will usually refer to a board that
> > is
> > Epoxy Resin bonded fiberglass. CEM boards are often a Synthetic Resin
> > bonded
> > paper. So be careful when choosing your boards, and don't just assume
> that
> > all FR-4 Boards are double clad.
>
> CEM isn't SRBP! It's a composite of thin fibreglass and compressed paper.
>
> Leon
>
>
>
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