Lenny,
 
It not uncommon that your supplier wants to change to higher Tg material. It really is not for the reasons you think. Higher Tg materials give you a larger reflow processing window, better for higher temperatures and multiple thermal excursions. If moisture is eliminated during processing. Lower Tg will process successfully as well if moisture is eliminated during processing. Most PCB manufactures want to use only one Tg material as it is becoming more standard, more laminate manufactures want to standardize their resin systems to eliminate down time for change over's. Some laminate manufacturers only supply high Tg FR4. When you evaluate the inventory cost, and benefits of processing one Tg material, it makes good business sense.Scott B. Westheimer5709 Clarks Fork DriveRaleigh, NC [log in to unmask]: (919)713-0748Cell NC: (919)961-5364 > Date: Thu, 14 Aug 2008 12:19:44 -0400> From: [log in to unmask]> Subject: [TN] TG 130 or Tg 170 for ENIG> To: [log in to unmask]> > Hey technetters- We adopted the ENIG finish for our RoHS compliant parts 2> years ago. We recently had discussions with our primary pcb vendor and they> recommended we switch to a Tg170 FR4 material for our pcbs instead of our> standard Tg130 we have been using for years.> This recommendation was made because of the higher reflow temperatures> necessary for the lead free process.> > Is this standard practice? we are a little hesitant to make the switch as> it would mean an approximate 5%price increase on all our pcbs.> > Any input is appreciated.> > thanks, Lenny Carter ERG, Inc. www.ergpower.com> > > ---------------------------------------------------> Technet Mail List provided as a service by IPC using LISTSERV 15.0> 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> -----------------------------------------------------
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