Hi Joe and Jack, You peaked my interest enough to make a comment and ask a question... I have been hearing rumblings in the industry about lead free soldering for awhile now... and I understand that there are some obstacles to the process that are undesirable at best. Pure tin welds for component mounting are more than likely more brittle compared to tin/lead alloy welds. And the tin/lead alloy melts at a much lower temp than tin by itself... This means exposing the components to much higher temperatures in order to solder. Extreme temp exposure is probably undesirable for a lot of reasons structurally and electrically... Is the only benefit environmental? Are we just trying to formulate 'lead free' to avoid using lead because of its poisonous nature or is there some other benefit from the process that escapes me? Gold uses cyanide in its process.... should we be gold free too? Bill Brooks PCB Design Engineer , C.I.D. DATRON WORLD COMMUNICATIONS, INC 3030 Enterprise Court Vista, CA 92083 Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 mailto:[log in to unmask] IPC Designers Council, San Diego Chapter http://www.ipc.org/SanDiego/ http://home.fda.net/bbrooks/pca/pca.htm -----Original Message----- From: Joseph Fjelstad [mailto:[log in to unmask]] Sent: Thursday, January 10, 2002 3:33 PM To: [log in to unmask] Subject: Re: [TN] Lead Free Soldering Hi Jack What is the intent of this comment? "Of course, subscribing to the IPC sponsored forum NoLeadTech is another way to get answers. That forum is reserved for discussion of lead-free soldering research and implementation issues. Another forum is leadfree but questions about how to do something on that forum usually get more comments about why you shouldn't be asking than answers to your questions." It sounds rather disparaging. Information about the problems of leadfree should not be swept under the rug. Opposing information and views are not threats. Shutting down this site is one way to end the discussion if that is what is sought. Kind regards, Joe ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To recieve ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To recieve ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------