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 > > > > "This e-mail message is intended only for the use of the intended > recipient(s). > The information contained therein may be confidential or privileged, and > its disclosure or reproduction is strictly prohibited. > If you are not the intended recipient, please return it immediately to its > sender at the above address and destroy it." > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 > ----------------------------------------------------- > -- http://www.cypenv.org Cyprus environment/energy http://www.cypenv.org/worldenv World environment/energy http://www.cypenv.org/weather Cyprus weather http://www.cypenv.org/smf/index.php Environment/energy forums http://groups.yahoo.com/group/cypnature/ Cyprus nature forum "This e-mail message is intended only for the use of the intended recipient(s). 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