thanks for your comments, we hope to do a no via design

i hadn't thought about the flammability, will look into that
but lots of UL/CE products use phenolic bds

Dennis Saputelli

Brad Velander wrote:
> 
> Dennis,
>         while you state this is a single etch layer design, I assume that
> you have vias. Am I right? Phenolic or CEM1 will not electroplate reliably
> or at least not without contaminating the plating bath with phenols. If you
> are doing the silver via epoxy process then forget the above comments. If
> you are plating then you will want to look at CEM3 at least, possibly CEM4.
> CEM 3 and CEM4 have fabric reinforcement of the laminate and will plate
> without contaminating the bath. DO you need UL fire rating? Then you will
> want to look at FR1. Lots of issues, lots of possibilities. Look into the
> glass temperature of whatever you select.
> 
> Sincerely,
> Brad Velander.
> 
> Lead PCB Designer
> Norsat International Inc.
> Microwave Products
> Tel   (604) 292-9089 (direct line)
> Fax  (604) 292-9010
> email: [EMAIL PROTECTED]
> http://www.norsat.com
> 
> Visit us at Booth 2G2-09 at CommunicAsia 2002 in Singapore June 18-21.
> 
> > -----Original Message-----
> > From: Dennis Saputelli [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, May 30, 2002 9:34 AM
> > To: Protel EDA Forum
> > Subject: Re: [PEDA] Help re bd material
> >
> >
> > can anyone advise me on the following please?
> >
> > i am about to do a design for a 150,000 pc run
> > for cost reasons (low end commercial product) the bd material must be
> > made out of night soil (actually phenolic)
> >
> > the design is SMD and to be a single sided bd (one etch layer)!
> >
> > the lead pitch is 0.5mm on a 108 PQFP and a 48 PQFP
> >
> > trace density and net count will be low so i think it will be routable
> >
> > so the question is:
> > are there etch considerations, lead pitch minimums or other
> > considerations regarding the material?
> >
> > i.e. can you actually put a 108 PQFP on phenolic and reflow
> > it properly?
> >
> > i guess CEM might be a possible choice
> > every dime is $15K, so this stuff matters
> >
> > we are not going to do a proto, just going right to the run
> > (only kidding!)
> >
> > Dennis Saputelli

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