In general, "it depends" mainly on the level of assembly and possible
rework situations you need. Standard Tg/Td FR4 products are fine for
say, a 4 layer panel with 3 or 4 above Tg excursions. Indeed, we tell
our customers, that our standard FR4 (Isola's 104TS with higher Td and
slightly filled) will be good for 10 layers as long as it's not hammered
in the heat dept. Therefore, a /24 material will suffice. Above this
technology, we go with high Tg & Td.
There is so much hype about the higher performing materials out there,
but it comes at a cost, and availability issues.
Colin McVean M.Inst.C.T.
Production Manager
Artetch Circuits Limited
Main: 01903 725365
DD: 01903 712926
Email: [log in to unmask]
www.artetch.co.uk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Ball
Sent: 17 May 2006 16:10
To: [log in to unmask]
Subject: Re: [TN] Rohs Weeeeeee board material
Thanks Brian and Colin-
So referencing IPC-4101/24 would be OK? I know we need the right mojo
with
the Td's and Tg's... for now am assuming we'll need a Tg higher than
/21. I
don't know how to handle the Td (or what I SHOULD spec.) without calling
for a specific vendor's laminate. Am trying to keep it more generic for
now, as it's just a speculative costing...
-Chris
Brian Ellis
<[log in to unmask]> To: TechNet
E-Mail Forum <[log in to unmask]>, Chris
BALL/AuburnHills/VSDS/VALEO@VALEO
05/17/2006 10:42 AM cc:
Subject: Re:
[TN] Rohs Weeeeeee board material
Bromine is NOT disallowed, only a couple of specific bromine compounds
that are not normally found in laminates. Most FR4 is flameproofed by
tetrabromobisphenol A which is permitted.
Brian
Chris Ball wrote:
> Hello Folks-
>
> We're trying to cost a new design which may have to be leadfree, rohs
> compliant, etc...
>
> We would otherwise reference IPC4101/21. Any recommendations as to
what
we
> should specify for this one? We were gonna ref. /24 but that's got
> bromine......
>
> Thanks in Advance,
> -Chris
>
>
>
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