I have a question about the variation of the tin content in the solder 
alloy and I'm sure that somebody will explain it me.

Why the tin content decrease more than 1% from the nominal of the 
Sn63Pb37 alloy? May it be by the dross...?

I suppose that it will be neccesary to add pure tin. Is it correct?

Thank you for your support. Kind regards.

Juan

Indra Sistemas SA
Spain

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