Isn't that just under the 4553 1.4.2 'Contact Surface' section? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo Sent: Wednesday, April 15, 2009 5:34 PM To: [log in to unmask] Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid? I am not the one to judge. Ipc is the authority. -------------------------- Sent using BlackBerry ----- Original Message ----- From: Wenger, George M. <[log in to unmask]> To: TechNet E-Mail Forum <[log in to unmask]>; Joyce Koo Sent: Wed Apr 15 17:31:10 2009 Subject: RE: [TN] Gold/Tin Intermetallics, why are we afraid? Joyce, If ImAg is not recommended for IPC-6010 Class 3 what surface finishes are? Regards, George George M. Wenger Andrew Wireless Solutions Senior Principal FMA / Reliability Engineer 40 Technology Drive, Warren, NJ 07059 (908) 546-4531 [Office] (732) 309-8964 [Cell] [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo Sent: Wednesday, April 15, 2009 5:11 PM To: [log in to unmask] Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid? "ImAG finishes have a 12-month shelf life in a controlled environment (<35[degrees]C/<85[degrees] RH), which can be significantly shortened when exposed to air pollution with high sulfur and chlorine content. Silver embrittlement Embrittlement A general set of phenomena whereby materials suffer a marked decrease in their ability to deform (loss of ductility) or in their ability to absorb energy during fracture (loss of toughness), with little change in other mechanical properties, such ([Ag.sub.3]Sn intermetallics) of solder joints may occur when the finish thickness exceeds IPC-4553 recommendations and Pb-free, high silver content solders are used. ImAG is not recommended for high-reliability assemblies that must meet IPC-6010 Class 3 requirements, but is acceptable for Classes 1 and 2." http://www.thefreelibrary.com/Will+discoloration+tarnish+ImAg+reliabilit y%3F+Watch+for+silver...-a0193896272 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /* Sent: Wednesday, April 15, 2009 4:34 PM To: [log in to unmask] Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid? Hi Vlad, I cannot comment on your specific case, but look at the pics below to see Ag-embrittlement. Sorry 'Netters, IPC strips pics. 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