Guenter, Thank you so much for the prompt reply. Regards, Wee Mei Guenter Grossmann wrote: > Wee Mei > > The question of design rules came up by the fact that the wetting > behaviour of led free solder in the possible process window is somewhat > different from the one of SnPb. However, our trials in LEADFREE and some > pilot production in the companies associated in the project with > standard design rules showed no problems in the soldering process due to > the design. It can be, in wave soldering, if space is very restricted > and thus no solder thieves can be used when soldering fine pitch > components and components are set close together, you see more bridges . > But it has to be emphasised that, if the IPC design rules are > consequently applied, lead free soldering is not a big deal. > > Best regards > > Guenter > > EMPA > Swiss Federal Institute for Materials Testing and Research > Centre for Reliability > Guenter Grossmann, Senior Engineer > > 8600 Duebendorf > Switzerland > > Phone: xx41 1 823 4279 > Fax : xx41 1823 4054 > mail: [log in to unmask] > > --------------------------------------------------- > Technet Mail List provided as a free 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/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 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------