Hi Keach, I 'm LW Foo Currently work on Lead free solder "spheres" , would it standard apply to solder spheres? Currently what I 'm working on is SnAgCu alloy, would appreciated pls advise.. Thanks & Regards L.W.Foo Engineer - Advanced Technology Foo Loke Whong Carsem Semiconductor Sdn Bhd Email id : [log in to unmask] Phone : +(6 05) 5262333 Ext : 530 Fax : +(6 05) 5265333 > ---------- > From: Keach Sasamori[SMTP:[log in to unmask]] > Reply To: Leadfree Electronics Assembly E-Mail Forum.;Keach Sasamori > Sent: Wednesday, May 30, 2001 10:13 PM > To: [log in to unmask] > Subject: [LF] Lead-free tolerances > > Posting for Kay Nimmo: > > From: "Kay Nimmo" <[log in to unmask]> > To: "Leadfree Electronics Assembly E-Mail Forum." <[log in to unmask]> > > The ISO 9453 standard defines specific composition ranges for each alloy > rather than general tolerances; e.g.=20 > > Sn-5Sb can have 4.5 to 5.5%Sb > Sn-4Ag can have 3.5 to 4.0%Ag > Sn-1Cu can have 0.45 to 0.9%Cu > > I imagine these composition ranges were set to limit significant changes > to liquidus/solidus. Newer lead-free alloys are in the process of being > added to the standard.=20 > > Kay Nimmo > > > -----Original Message----- > From: Lynn Norman [mailto:[log in to unmask]] > Sent: 29 May 2001 17:03 > To: [log in to unmask] > Subject: [LF] Lead-free tolerances > > > We're starting our in-house evaluation of lead-free solder. The > composition > we are initially looking at is 95.5Sn-3.8Ag-0.7Cu. Our current spec for > SnPb has a +/- tolerance of 0.5% on the composition. What kind of > tolerance > will the lead-frees have? How much of an effect will the variability > have > on solidus/liquidus temperatures? Just curious as to what others are > doing. > > -------------------------------------------------------------------------- > ------- > Leadfee 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 Leadfree > To temporarily stop delivery of Leadree for vacation breaks send: SET > Leadfree NOMAIL > 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 > -------------------------------------------------------------------------- > ------- > --------------------------------------------------------------------------------- Leadfee 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 Leadfree To temporarily stop delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL 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 ---------------------------------------------------------------------------------