-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(AZ75)
Sent: Wednesday, May 17, 2006 10:44 AM
To: [log in to unmask]
Subject: Re: [TN] Rohs Weeeeeee board material

Revision B of IPC-4101 is in the balloting process. All Bromines that
are listed are designated as RoHS Compliant.
Ian could you contact me on a Nadcap issue?
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Ball
Sent: Wednesday, May 17, 2006 8:20 AM
To: [log in to unmask]
Subject: Re: [TN] Rohs Weeeeeee board material

Thanks Ian-

I found another reference to this material elsewhere, so am starting to
feel warm and fuzzy (but that's another story).

Is the revision to IPC-4101 that specifies /98 actually released yet?

Best Regards,
-Chris




                       "Fox, Ian"
                       <[log in to unmask]>            To:
[log in to unmask]
                       Sent by: TechNet                  cc:
                       <[log in to unmask]>                 Subject:    Re:
[TN] Rohs Weeeeeee board material

                       05/17/2006 11:02 AM
                       Please respond to TechNet
                       E-Mail Forum; Please
                       respond to "Fox, Ian"







Chris, RoHS doesn't bar the use of the Br retardants usually used in the
epoxy/glass used in PCBs (tetrabromobisphenol A), so you don't
necessarily need a halogen free material for RoHS compliance unless you
absolutely want to future proof the design. As far as materials go I'd
probably reference 4101/98 which is a filled material with halogen
retardant (polyclad 370HR being an example of the type) which gives
improved via reliability from a degree of Z-axis CTE control resulting
from the filler addition. I'm not sure that the halogen free materials
are sufficiently mature yet and have no experience with them so can't
recommend one, but 370HR is good.

Regards
Ian Fox
Lead Process and Materials Eng
Goodrich ECS
York Rd
Hall Green
B'ham B28 8LN

Tel: 0121 607 3763
e-mail: [log in to unmask]

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