Carrie,

what about contacting one of your board suppliers, that do immersion tin, and ask them to send you something showing for how long have they been doing this finish and roughly how many boards of the kind they did up to now.

Maybe your customer is not a Chem-E either and dissolution means nothing to him.

Good luck,
Ioan

> -----Original Message-----
> From: Leadfree [SMTP:[log in to unmask]] On Behalf Of Morse, Carrie
> Sent: Tuesday, November 01, 2005 4:22 PM
> To:   [log in to unmask]
> Subject:      Re: [LF] Matte Tin Lead Finish in Good old SnPb Joints
> 
> I agree.
> I needed to ask the question as unbiased as I could.  My customer asked
> to me to ask.
> 
> I am trying to convince him that the solder joints we currently make
> using tin finished parts are OK.  I'm not sure he believes me when I say
> "Tin has been used on leads for YEARS".  Just because we now have RoHS,
> does not mean that Tin is a new finish!  
> 
> If anyone has any recommendations on how to explain HOW the Tin
> "dissolves" I would appreciate it.  I'm not a Chem-E and need to tell
> the customer something that sounds like I'm not trying to lie.
> 
> Thanks,
> Carrie
> 

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